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Old Aug 16, 2005, 08:29 PM
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Mini-Review
MiG-15 by WeMoTec

Here's a few pictures of the MiG-15 I got today in the mail from WeMoTec.

It's designed for a 90 mm fan, eg MidFan or possibly Jepe/DS fans. I plan on installing the Midi with a Hacker B50 on 6S Lipos. Retracts will be Springair 602's (which I already have), or I might just fly it first w/o gear.

The fiberglass/carbon composite kit is actually made in the Czeck republic and distributed by WeMoTec. I have one of the prototypes, the kit will be generally available late in the fall for around 300+ euros.

The FG work is first rate, with gel coating and very well made panel lines. No need for heavy layers of primer on this one either. Empty weight of kit (w/o servos, linkages, fan etc) is 23.8 oz = 675 g, extremely light weight .

Wings are removable with steel alignment pins and fiberglass spar stubs.


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Old Aug 16, 2005, 08:34 PM
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A couple more pics ...


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Old Aug 16, 2005, 08:43 PM
more power=almost enough
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That looks smooth.........Nice looking just sitting there before any work has been done. Looks like they have even wrapped carbon fiber around the ducting
What are the dimensioins?

Kerry
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Old Aug 16, 2005, 08:49 PM
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Wingspan is around 103 cms, weight estimated with old round cells in the 75 oz range rtf. Airfoil is an RG-14.

It's comparable in size to the Aeronaut Panther, and quite a bit larger than the K&A MiG-15 (designed fro MF480/HW609).

It has a high degree of prefabrication, contains almost all the basic hardware (joiner, linkages, ball links), and comes with a very detailed instruction cd.

The battery box was designed for round cells, so LiPos will require a bit of extra work.
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Old Aug 16, 2005, 08:51 PM
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Sigh, So many MiGs, so little time. This one looks like a real winner.


Rob
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Old Aug 16, 2005, 08:58 PM
more power=almost enough
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Now that is the size of plane that these eyes enjoy seeing in the air. And maybe even enough room inside for my big paws to work in. I look fwd to following this thread with interest. Keep us posted on the release date for the rest of us if you hear anything Herb.

Thanks,
Kerry
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Old Aug 16, 2005, 11:12 PM
Carbon fiber is our friend
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That looks great Herb. I'm more interested these days in stuff that can fit retracts.
Clear canopy on the way?

Steve C
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Old Aug 16, 2005, 11:19 PM
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WOW! oh and WOW! Love it. Perfect size too. And is it me or did they enlarge the vertical instead of enlarging the horizontals? I know with planes of this layout one needs to be altered a bit for better flight. If they did I like it, looks more scale than an enlarged horizontal.

Barry
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Old Aug 17, 2005, 02:36 AM
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Looks great Herb,

I love the panel line details, the removable wings are a real plus!

Looking forward to seeing you work your magic on this new Mig.

Markos
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Old Aug 17, 2005, 04:56 PM
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Very nice indeed,
looks a good candidate for my first midi edf


Herb, do you know the name of the company in the czech republic? thats really nice work, maybe they do afew other interesting models!
thanks
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Old Aug 17, 2005, 05:26 PM
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It is their first EDF model and we will start to deliver in about 6-8 weeks from now.

Oliver
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Old Aug 17, 2005, 05:39 PM
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Hi Oliver,

I think it is safe to say, you're going to be very busy with a lot of orders for your new Mig-15.

Very nice addition to your product line!

Markos
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Old Aug 17, 2005, 05:46 PM
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Yeah Oliver I'll take one of these and a new big fan and I can die happy! lol


Barry
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Old Aug 18, 2005, 12:41 AM
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Oliver!

Warum habe ich noch keine MIG-15, die Cutlass habe ich bis auf den Querrudereinbau fertig!

"Oliver!
Why do I have no Mig-15, the Cutlass is almost finished, just to prepare the ailerons"

Heiner
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Old Aug 18, 2005, 12:45 AM
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translation please for those of us that know how to speak english, but still are learning to read.

Gene
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Old Aug 18, 2005, 02:12 AM
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It say Oliver please make sure Barry gets one of these very soon, or I shall throw a fertig.


Barry
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Old Aug 18, 2005, 03:05 AM
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Hi Guys,

I must agree, it's a very very nice design!

I have seen the designer with his prototype on E-Meeting a few months ago.
If i'm right his setup was ... :
Wemotec Midifan with MEGA motor and 16cells NiMH.

I have made a small movie of his flight:
MIG15 Prototype on E-Meeting Oss (NL) - 8,5MB

Good Luck Herb!

Grtz,
Emile
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Old Aug 18, 2005, 03:16 AM
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I also found 2 Photo's made by ... :
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Old Aug 18, 2005, 03:32 AM
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Is he sniffing Amps????
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Old Aug 18, 2005, 03:43 AM
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Quote:
Originally Posted by Heiner Skroblin
Is he sniffing Amps????
LOL, maybe even some "Grass" too.

Erik always sticks his nose directly in to prototype jets, didn't you know.

Grtz,
Emile
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Old Aug 18, 2005, 03:54 AM
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Could be my brother in that case .....

Heiner
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Old Aug 18, 2005, 06:29 AM
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Quote:
we will start to deliver in about 6-8 weeks from now
Oliver,

Well it seems you’ve got a Winner on your hands with this beautiful Mig-15 that’s for sure.

BUT THE BIG QUESTIONS IS: Will it be available in sufficient numbers???

A lot of times in the past we’ve seen the phenomenon that a manufacturer shows off a really beautiful kit……………………. and then when the customer wants one……………… OOPS NOT AVAILABLE…. Yeah that turns people off certainly.

I HOPE WITH THIS ONE IT WONT TURN OUT THAT WAY!!

BTW do you take preorders ? ? ?

Have fun,

Appie
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Old Aug 18, 2005, 06:45 AM
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Hi Appie,
your correct.
Actually the design is around for a couple months but I held it back due to the quantity problem.
The manufacturer wants to deliver 3 models a month (!). I hope it will be more and I try to get my hands on as many as possible.
But this kit is a lot of work in production, since it is really nearly ready. I have never before seen such a complete kit.

So keep fingers crossed and I keep pushing.

Oliver
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Old Aug 18, 2005, 07:19 AM
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The first 2 month of production to my hands .....

Heiner
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Old Aug 18, 2005, 07:40 AM
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Herb,
I'll be your test pilot so you can take video.................see you Labor day weekend at the pit!.
Regards,
Bob
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Old Aug 22, 2005, 02:59 PM
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I doubt I'll even have a servo installed by then ... still waiting for the fan as well.

Steve C, yes indeed they should have a clear canopy included in the kit, as an option. For such a beautiful (and quite close to scale) model a clear canopy (& pilot) would add a needed touch of realism. That would be my no. 1 request to the manufacturer. A scale intake lip would be my no. 2 request.

Also the kit has no decals, a few russian stars & czeck markings would be nice (I can already hear the sound of Ralph S. drawing red stars on his computer ).

It seems there's no fences, so I guess it does not need them. Will find out on the first downwind turn .
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Old Aug 22, 2005, 03:02 PM
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The fan, fence and decal issues are fixed now.
Fan was my fault, the other items where delayed and will be part of future kits.

The clear canopy is on my wishlist too. But the manufacturer told me we will have to wait till summer 2006 for the next revision.

Oliver
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Old Aug 22, 2005, 03:28 PM
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They should add a clear canopy as an option. Just deliver the kit as it is now, but with a clear canopy as an extra item.

Then let the modeler decide whether he wants to spend extra time fitting the clear canopy on.

I think they can use the mold they have now to make a nice looking clear canopy in no time, that's my guess, but I could be wrong.

Fences are easy for me (and others) to make, all you need is some sheets of styrene. Russian decals are no problem either,

http://www.rcglider.com/Accessories.HTM

http://www.sheldonshobbies.com/listing/maj.html
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Old Aug 25, 2005, 06:37 AM
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Quote:
Originally Posted by WeMoTec
Hi Appie,
your correct.
Actualy the design is around for a couple months but I held it back due to the quantity problem..........................
Oliver

Actualy design flies longer than a year, last year it was flown on Jeti Model Meeting in Hranice, CZ.
http://www.10jmm2004.wz.cz/images/let/PICT0022.jpg
You just saw it fly in Hude.


Herb, what do you plan for Miggy?
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Old Aug 25, 2005, 07:24 AM
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@ Jindra:

I meant the "commercial" design, not the prototype.
I only wished I could get more. Wish list is growing rapidly.

Oliver
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Old Aug 25, 2005, 07:29 AM
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My wish list is growing faster than I can build ........................

Heiner
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Old Aug 25, 2005, 07:35 AM
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Quote:
I only wished I could get more. Wish list is growing rapidly
Oliver,

No surprice there..........

You should go and sell them as a "Combo pack", with MidiFan & Motor & ESC that is (Top Tip ??)

Have Fun,

Appie
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Old Aug 25, 2005, 07:40 AM
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Oliver:
I believe, that kit was done by September last year. Proto is much different now. Also quite heavy, 2240g. No Herex and lots of balsa pieces here and there. Nevetheles, she flies just fine. I haven't flown the kit yet..
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Old Aug 25, 2005, 09:38 AM
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My wish list is growing faster than my bank account allows !
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Old Aug 25, 2005, 02:07 PM
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We must be talking about different kits, as the one I have is very light, one of the lightest glassworks I have ever seen. RTF weight depends on what cells you put in, so that's not particularly relevant . I posted the empty weight of the kit on the first page.

The kit includes a very nice CD with over one hundred of challenged-proof pictures (see example below) and a nice video of the prototype, which seems to fly very well.

MiG-15 prototype video (15 MB mpg)



.
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Old Aug 25, 2005, 02:47 PM
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@Herb:
Jindra is the original designer of the model and I understand that it is his own prototype model that is a little overweight now due to modifications.

And his prototype was not produced by the guys who did the kit you got.

Oliver
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Old Aug 26, 2005, 01:49 AM
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Herb, we talk the same kit, only difference is material used. Fuselage is the same, wings and tail is balsa against herex you have, but as Oliver said my is modified a lot since that time. Funny part is that it doesn't really mind going from 120 to 135 g/dm^2. Originaly she flew with 450W, these days it is 750W+, I still did not pluged Medusa in shame on me
Do you know your actual setup? Remember Mig was subsonic - keep it that way
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Old Aug 26, 2005, 04:08 AM
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Two years more of Lipo and new electric motors, and we will crack Mach1 .......

Heiner
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Old Aug 26, 2005, 12:17 PM
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Quote:
Originally Posted by Jindra M
Herb, ... Do you know your actual setup? Remember Mig was subsonic - keep it that way
Hello Jindra,

Most likely the setup will be MidiFan (or JePe fan if I can't get a Midi anytime soon ), Hacker B50-18S, Hacker 77 controller and 3S+3S=6S Kokam 3200 HD's .

I might fly it & trim it out on the bungee first, and then retrofit Springairs 602 (which I got a month ago). It will be hard to cut up that beautiful glass work.
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Old Aug 26, 2005, 05:37 PM
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Hi Herb

Quote:
hard to cut up that beautiful glass work
From my experience, it'll be even harder to get the 602s into an 8.5% thick RG14 wing. My slightly bigger (44" span) MiG 15 needed the root section at 13% and tip at 10% to get the gear in. It worked out that those were around the scale thicknesses too.
My installation had the main gear units swept forward 17deg in plan view, and swept back 17deg in the side view, almost the same angles as the full size. At any other orientation the wheels won't retract fully into the wing root.

An alternative setup might be to fit the mains into scale drop tanks.

It's gonna be a measure ten times cut once operation

Gordon
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Old Aug 26, 2005, 08:43 PM
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My wish list is growing faster than I can build ........................

Heiner[QUOTE]


Not possible! lol

Barry
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Old Aug 27, 2005, 12:24 PM
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The wing is indeed quite thin, and the Springair retract mount might have to stick out a bit at the bottom. So for you Gordon the pictures will only show the top of the wing

If I do install retracts though, I don't see any other viable setup. The Springairs work and can be relied on.



.
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Old Aug 28, 2005, 08:00 AM
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Herb,

I know you fly from dirt field but there was never intention to fit retract in plane that small. You may try, but..... You may want to beef up wing root structure if you cut holes in the lower sheeting. Nose gear would be paint to squeez in, not much space nor easy acces. Fuse should not be thick there, no support for retract provided. Not to mention the weight gain.
Fly it first, maybe with a layer of glass reinforced tape on the belly. Hint you land on the second half of the fuselage in high alpha or it gets froggy (10 jumps no exception) and you walk a lot. Proto takes a lot, and wouldn't drop a wing easily. Your setup sounds like 1kW+, hmmmm hope you are good on throttle
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Old Aug 28, 2005, 10:54 AM
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Weight gain? Fear not the extra weight of retracts in 90 mm EDFs....ROG is so much better than hauling a bungee around in my opinion. Of course you need the smooth, hard surface to take off from.... The weight savings of lipos can make up for the extra weight of retracts.

The EJF and I think JHH retracts are thinner in height than the springairs by about 3/32 to 1/8 inch. Two airlines are needed but they are thinner. I designed my F-22 for the EJFs then got a springair set and they were too deep to use.
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Old Aug 28, 2005, 01:04 PM
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Quote:
Originally Posted by Jindra M
Herb,

I know you fly from dirt field but there was never intention to fit retract in plane that small. You may try [...] Not to mention the weight gain. [...] Hope you are good on the throttle
I retrofitted retracts on the Aeronaut Rafale and the Aeronaut Panther, and they rog fine off of dirt (see pic below). The Rafale on takeoff blows a plume of dust 100 feet long ...

But I agree the wing is light and thin, so some reinforcing is necessary. I would not use anything but Springairs 602's though.

You guys have to understand that the more you tell me it can't be done, the more I set my mind to it

Seriously, I have also toyed around with the possibilty of doing an Ulf Herder type of setup, namely use a hot motor (Hacker B50-12S, kv=2000) on 3S Kokams 3200 HD, ca. 400-500 Watts peak in a 50oz (1420g) rtf setup.

With this setup it should rog off CA grass (ok Bob, gravel ) no problem without lg. Or a Joerg Rehm jettisonable twin wheel dolly.

I've flown a few MiG-15's before (3x) and I like very much the way they handle. But I know also that too high wingloading means vicious tipstalls on landing approaches ...

Have you tried flying it without wing fences?


.
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Old Aug 28, 2005, 01:48 PM
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Quote:
Originally Posted by Herb

With this setup it should rog off CA grass (ok Bob, gravel ) no problem without lg.



.
Ok Herb let's settle on Prairie grass with the occasional pebble.
If I lived there I'd be a regular at that field too.
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Old Sep 01, 2005, 08:38 AM
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Quote:
Originally Posted by Herb


You guys have to understand that the more you tell me it can't be done, the more I set my mind to it

Seriously, I have also toyed around with the possibilty of doing an Ulf Herder type of setup, namely use a hot motor (Hacker B50-12S, kv=2000) on 3S Kokams 3200 HD, ca. 400-500 Watts peak in a 50oz (1420g) rtf setup.

With this setup it should rog off CA grass (ok Bob, gravel ) no problem without lg. Or a Joerg Rehm jettisonable twin wheel dolly.

I've flown a few MiG-15's before (3x) and I like very much the way they handle. But I know also that too high wingloading means vicious tipstalls on landing approaches ...

Have you tried flying it without wing fences?


.
Everything can be done, if you try hard enough, I saw your retract conversions of aeronaut birds.
Once again, proto flies with a wing load people never believe to make a turn without staling. She never did. I saw more crashes on landing due to the high speed landing and subsequent jumps than from a tip stall.

I do not try to fly without fences. Doesn't look right and would ruin the flying characteristics. If you did not receive yours and do not want to wait take 0,8mm ply and make your own ones. I know you are a scratch builder, so it shouldn't be a problem.

ROG without gear has been done with even with 450W last year. I broke hook off and had a full pack in. 30m on wet short grass and she flew. I do not like idea of geting forign object in ducting so I do not start without bungee ( if I don't have to )
Looking forward your flight report.
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Old Sep 06, 2005, 11:32 PM
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I basically agree with all your points:

A model should be flown more or less within its intended design parameters . We'll see ...
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Old Sep 10, 2005, 12:51 AM
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Herb,
Any updates on the Mig?
Kerry
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Old Sep 12, 2005, 06:16 PM
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... Not really much to report. I got the Midi fan & fg fences (thanks Oliver), but my trusty Kokams 3200 HD's don't fit in the battery bay. But the PQ 3100 do fit, as they are thinner and narrower. Unfortunately I found out the hard way that in spite of the overhype it's a worthless cell for > 8C and therefore not really suitable for edf.

The MidiFan fits perfectly, so not much work expected there. This all-molded MiG-15 is almost too pretty to fly . What a work of art ....
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Old Sep 12, 2005, 07:24 PM
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Thanks Herb,
I talked to Oliver over the weekend, looks like I am down the list a bit to receive mine. Hopefully some people in front of me will cancel some of their orders.........not likely, but I can hope. Anyway that will give you plenty of time to get it ringed out for the rest of us. That way I will know just exactly what to put in it. I am looking fwd to flight reports and video.

Kerry
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Old Sep 13, 2005, 09:27 AM
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No! NO!

I will not cancel and I am hoping to stay in front of you at that list.......

Heiner
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Old Sep 13, 2005, 10:56 AM
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Quote:
Originally Posted by Herb
but my trusty Kokams 3200 HD's don't fit in the battery bay

Herb, do you think they are able to modified the battery bay in the future because, in my opinion, the most popular Lipo should fit.

Regards,

Harry
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Old Sep 14, 2005, 07:31 AM
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Quote:
Originally Posted by Herb
... Not really much to report. I got the Midi fan & fg fences (thanks Oliver), but my trusty Kokams 3200 HD's don't fit in the battery bay. But the PQ 3100 do fit, as they are thinner and narrower. Unfortunately I found out the hard way that in spite of the overhype it's a worthless cell for > 8C and therefore not really suitable for edf.

The MidiFan fits perfectly, so not much work expected there. This all-molded MiG-15 is almost too pretty to fly . What a work of art ....
How about a detail shot of the battery area and some dimensions.
Let's figure out the best high performance Lipo cell for this model.
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Old Sep 20, 2005, 12:47 AM
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Herb,

do you think we can place 2 packs of 3s1p KOKAM 3200 beside the tube?
There is enough Space, but how to fix them in that place?

Heiner
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Old Sep 20, 2005, 12:51 AM
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some one needs to make curved cells! lol


Barry
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Old Sep 20, 2005, 01:31 AM
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The battery bay is perfectly shaped to accept a double stick of 7-8 = 14-16 GP-3300 sized cells. It's made out of FG and has the required flattened oval shape. Perfect for sub-c Ni-xx cells. Too bad nobody really cares

That FG tube needs to come out. But boy did they secure it well, between intake & belly . When it's out, two sticks of Kok 3200's (3S+3S=6S) will be a perfect fit, and the CG should come out ok too (I re-calculated it).

So, to make a long story short, I need to dremel two long cuts under the belly and get that FG battery tube out. After that, the Kok's will fit perfectly (they are about as thick as a GP cell). Then it'll land right on the Kokams ...
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Old Sep 20, 2005, 01:46 AM
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Herb!

That's the point, I want to let the empty CP tube where it is, may be I fill it up with some Styro as a shock absorber. I don't want to land on my KOKAM's.

I will think about some packs 2x 3s1p right and left beside the inlet tube, set in through the opened canopy. Should be ok for CG. I made that at my Huckebein from Steve that way.
Do you think I have to make the formers for EDF hold stronger, if I set in the more heavy LEHNER 1950-11 hiamp? After a harder landing it would tear out I fear.

Heiner
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Old Sep 20, 2005, 05:33 AM
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I had to remove the twin fibreglass battery tubes from my Schuebeler Vector so that my Lipos would fit. Daniel recommended forcing a wood chisel between the battery tubes and the fuselage skin and using it as a lever to break the glue; it worked a treat, but there wasn't a lot of glue there.

If a chisel won't fit in the MiG, perhaps a stiff kitchen knife will do the job.

Of course, if the MiG's tubes are glued in differently, eg to both fuselage skin and ducting, you have a bigger problem than I had.

Gordon
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Old Sep 20, 2005, 05:48 AM
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Herb would need very thin and long fingers to dremel that out. Or we have to ask a XXXXXXXXXX to do the job.

Heiner
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Old Sep 20, 2005, 10:20 PM
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Quote:
Originally Posted by Heiner Skroblin
I don't want to land on my KOKAM's.


Heiner

I don't know why, well actually I do, but this statement made my laugh so hard tears started comming from my eyes. I don't think I want to land on my KOKAM's either.

Kerry
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Old Sep 20, 2005, 11:07 PM
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No Coment.

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Old Sep 22, 2005, 05:22 PM
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Quote:
Originally Posted by Gordon
... perhaps a stiff kitchen knife will do the job...
Where would edf be today without Gordon ...

I took out the kitchen knife, and it detached the battery tube pretty well - all the way up to the front, where unfortunately those dedicated czek fiberglass molding masters had made sure it would not come lose even in the worst possible spiral crash ...

I then opened a small hole in the front, and finally out it came.

Now the Kokams fit in the bottom, so maybe we'll see if "landing on your Kokams" is still an option. Heiner, the Kokams will fit on the sides too, but there's nothing to hold them in place. In any case, that's an alternative location.


.
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Old Sep 22, 2005, 05:27 PM
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The WeMoTec MidiFan fits nicely and requires very little work for installing.


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Old Sep 27, 2005, 12:57 AM
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Herb,

do you found any throws and the CG at your CD?

Heiner
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Old Oct 03, 2005, 03:08 PM
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Yes the CD has everything.

Heiner if you look at the picture of the fuse bottom I posted above, you will see a blue pen mark corresponding to the recommended CG.

The throws look reasonable too, but most of the time I just eyeball them and use a bit of expo.

The project is a bit on hold as the elevator linkages are very tight and just won't slide in the glued-in white plastic tubes. The tubes seem dimensioned too small, I used a dremel connected to the steel wire supplied for the linkage to try to free them, but it did not do much yet.

They should test that the supplied steel wires actually do move in the tubes before they ship them out. I don't like linkages that don't slide well.



Did a bit more work on the Sabre to HW-620 (85mm) fan conversion , which is almost complete:

.
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Old Oct 04, 2005, 12:44 AM
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Thank's Herb for answering my question, but almost too late!

I made the maiden at Sunday! Here is my setup:

KONTRONIK FUN 600-15
KONTRONIK JAZZ 80-6-18 BEC
5s1p KOKAM 3200
Schulze alpha 8.35
3x Hitec 85Mg
Throws: ailerons up 13mm, down 8mm expo 60%
elevator: up 10 mm, down 8 mm expo first flight 50% now 70%

The Mig flies just like my small Alpha Mig-15, but much more sensitive on elevator. For that reason I programed more expo, from 50 - 70%.
For landing it needs a long distance, I could fly 2 feed above the airfield for about 300 feet before touch down.
Sorry my didital camera is still at the service, for that reason no pictures!

Herb in case of those wires, you have to take the 0,6mm wires. If you tried the 0,8 mm it's like you discribed, that the tubes are plugged or too tight.

Heiner
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Old Oct 04, 2005, 02:34 AM
who dares wins
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hi Herb, Heiner,

what are the dimensions of the battery bay please.

kok 3200's 3s are~ 140*32*23mm
8GP3300 are ~ 180*46*24mm

now i understand you said oval!! "It's made out of FG and has the required flattened oval shape. Perfect for sub-c Ni-xx cells. "

would taking a dremell to the oval part be poss? is tray removal the best option?
Heiner, are your 5s kokams one pack?
thanks
alex
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Old Oct 04, 2005, 03:12 AM
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@ Alex,

the original battery bay is made for NiMH cells sub-C. I don't use them, I let it like it is, just to have something to make the bottom stronger. Because I set in no retracts, my Mig has to land on the fuselage. (I don't want to land on my Kokams, I told before ....)
The Kokams 3200 I used, are 1 pack 3s1p and 1 pack 2s1p, I placed left and right to the inlet tube through the opened canopy. For the first flight I fixed them in position with some Styro parts to get the exact CG at 166mm from LE, where wing meets fuselage.
Next fly I want to set in 2 packs of 3s1p to test 6Kokams for better motor performance.

Heiner
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Old Oct 04, 2005, 08:40 AM
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thanks Heiner,

ive ordered one from oliver, i want to use 5s Evo 20C 3700's 37*44*150mm 494g, i was trying to chose a motor for this battery to run at about 50amps max. would the mega 22/30/2 (kv1770,220g) or mega 22/20/3 (kv1850,165g) be suitable?
im not sure what amps these would pull

thanks
Alex
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Old Oct 04, 2005, 08:47 AM
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Alex,

I don't know the Megas at all. I use a FUN 600-15 what makes 1500rev/V. Ask Herb, I think he knows the Megas better.

Heiner
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Old Oct 04, 2005, 04:21 PM
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Hello Heiner,

Good to hear all went well !!! Mine's still sitting on the bench and will do so for a while. I like tight rigid linkages and will probably redo the tubing, the wire seems already thin as it is.

Alex the Megas should work well on 6S (or 5S if you think the amps are too high), do a search here, I posted some number on the Mega 20 and 30 here recently. A motor with a kv of 2000 or a bit less like 1800 will work well on 6S in the Midifan, with throttle management.

http://www.rcgroups.com/forums/showt...ighlight=Mega+

Btw it's best to buy the battery last, after you installed & measured the amp draw with a wattmeter.



.
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Old Oct 06, 2005, 10:48 AM
My project: FAIREY DELTA 1
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some nice info regarding this edf

http://www.modelbouwforum.nl/phpBB2/...er=asc&start=0

I have some nice vdo of Ger's mig on my HD. Fancy an E-mail Herb/ Heiner for hosting

greetz! Erik
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Old Oct 06, 2005, 11:59 AM
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@ Erik,

Dat Mig15 next to your Yak 23.
Is that powered whit a minifan, or midifan.
And do you now where he has gotten, the drawing for that wood build Mig15?

greetings Frank
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Old Oct 08, 2005, 01:38 AM
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Hello
Mig 15 is from Daniel Schubeler plan.
It is powered by Wemotec midi-fan, Ultra 930-5 (special wind) and 14 2400 mAh Nicad. This gives nice performance!!
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Old Oct 08, 2005, 11:07 AM
Let er Rip
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Watching this one..

Jim
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Old Oct 29, 2005, 04:32 AM
who dares wins
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Hi, any update.
also Herb with the battery tray removed is it possible to fit two packs of dimensions 100/53/34mm

thanks
Alex
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Old Nov 27, 2005, 02:46 PM
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The MiG-15 is almost ready for it's maiden (possibly already next weekend) ...

Power in the 1200 Watt range, weight rtf around 55 oz, takeoff by sliding on short grass.
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Old Nov 27, 2005, 02:49 PM
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Retrofitted the Kokam 3200HD's with TP taps for connecting to the TP balancer:
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Old Nov 27, 2005, 03:01 PM
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PVC Rail system

Herb,

What was the dimensions for the PVC rail system you used for the Pyranha


http://www.rcgroups.com/forums/attac...hmentid=640273


Thanks ~JOHN BANNER~
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Old Dec 03, 2005, 02:24 PM
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Quote:
Originally Posted by like2fly!
Hi, any update.
also Herb with the battery tray removed is it possible to fit two packs of dimensions 100/53/34mm thanks Alex
The Kokams 3200 HD are 7.6 mm T X 43.5 mm W X 131 mm L; the thickness for 3S is therefore around 23 mm. Anything thicker or wider will not fit.

If you read the posts above, you will see how Heiner has installed the batts in the fuse sides instead.
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Old Dec 03, 2005, 02:26 PM
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Quote:
Originally Posted by feenhere
Herb,What was the dimensions for the PVC rail system you used for the Pyranha http://www.rcgroups.com/forums/attac...hmentid=640273 Thanks ~JOHN BANNER~
It is about 2m (6ft) + extensions. If you do a search under my name you will find lots of pictures & videos of my PVC ramp setup.
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Old Dec 03, 2005, 02:31 PM
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I've accumulated a few more pictures of the MiG-15 ... The Midifan took some vinyl tape to balance properly on my magnetic balancer.

Later the Hacker B50 was mounted with a nice cooling gap, it will need it .
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Old Dec 03, 2005, 02:35 PM
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Elevator and aileron servo setups were rather straighforward, I did use ball links though instead of the recommended "thick steel wire & few bends" method ...
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Old Dec 03, 2005, 02:41 PM
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Motor, fan and exhaust duct slide right in and are secured with vibration/resonance damping silicone ...


.
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Old Dec 03, 2005, 02:45 PM
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Once installed, the fg duct fits well in the fuse ... 70A opto ESC nicely tucked in on the side.
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Old Dec 03, 2005, 02:51 PM
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All that's left after the maiden is to take out the masking tape & airbrush ... Would have been nice if I had recieved the decals


.
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Old Dec 04, 2005, 03:16 PM
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It's very windy this weekend so no maiden, I took out the airbrush instead .

The CSSR decals were easily made with monokote and an inexpensive circle cutter, for now they are just taped on.


.
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Old Dec 04, 2005, 03:45 PM
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@Herb,
you did not get the decals?

Oliver
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Old Dec 04, 2005, 05:06 PM
tow
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Are you going to maiden without wing-fences - noticed they`re not on the photo. My advice - put them on.
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Old Dec 04, 2005, 05:45 PM
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The Mig looks spectacular Herb!
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Old Dec 04, 2005, 10:33 PM
shut up & fly
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i forgot about this one very nice Herb

1 quick question .... on the intake do you ramp up somehow to the midi or do you just leave the edge of the fan housing as a 2mm step?
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Old Dec 04, 2005, 11:04 PM
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looks awesome Herb!

Barry
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Old Dec 05, 2005, 12:44 AM
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Herb,

I can send you the CSSR decals, I put on the USSR ones. Just let me know.

Heiner
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Old Dec 05, 2005, 01:06 AM
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@heiner:

no need, I already put another set in the post last night for Herb.

@Hoser:
The kit manufacturer already took care about this. Both intake and ducting match to the inner dia. of the outer shell. Nicely made, no need for fiddling with a Midi Fan, which the model was designed for. With the DS 51 a little modification is in ordr, due to the thicker shell of the fan.

I will drop you another email offline soon reg. the things you are waiting for. There is good news.

@all
With a new shipment recently we have reached the end of the waiting list. So delivery time of the MIG comes down to about 6 weeks at the moment.

Oliver
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Old Dec 05, 2005, 07:44 AM
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Nice work Herb, looking forward your maiden coverage. Did you get my mail from german forum? Are you still on that 55oz? Do you have any fresh air for the controller cooling? Temp shut down might strike when flying part. throttle for longer period of time. My one ended behind the fan...

All: Just a hint, CZ decals must have blue part in the front, white on the top and red bottom, on the wing red is towards the canopy, blue LE and white tip
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Old Dec 05, 2005, 12:46 PM
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Thanks for the comments guys !

Oliver, no decals here yet, but it should fly fine without them

tow, the fences will go on there at some point. Spanwise flow, what's that, you mean fly slow ??

Hoser, as Oliver mentions, the ducts have a nice transition in and out of the fan: They widen slightly just were the midi slides in, and restrict again just past it.

Ideally you don't want a step before the fan, even if it's a tiny 2mm, since it can cause turbulence and loss of fan efficiency. But in practice other considerations apply, and I always end up following the kiss principle. The last thing you want to happen is some stuff flapping or getting loose before the fan and get sucked in - with a loud bang

Heiner, thanks for the offer. But you should hold on to your decals, you might need them for another plane.

Jindra, no sorry did not get your mail. It takes me five minutes to swap controllers, we shall see. I already did a dry run / spool up of the fan in the MiG, the fan is as smooth as silk, and it's only 69A wot . The weight rtf is now at 63.7 oz (1810g), ca. 352 W/lb wot, should have adequate power.

Yes I noticed later the decal orientation, I think I will have to take out that Michael's circle cutter again ...

CG location revisions? Elevator trim? Elevator throws?
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Old Dec 05, 2005, 12:58 PM
EDF Jet Jam May 2014
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Herb,
350 watt/LB!!!!!!!!!!!!!!! A rocket no doubt.
At 1.8k the landings should be nice too.

I see the answer to my questions.
Regarding 3200 Kokams will they slide through the canopy opening to mount on each side of the duct OK?
69 amps static? I would think this will drop 6-8% in the air.
How did you resolve the drag in the elevator pushrod linkage.
Bob


I saw this post:

Herb in case of those wires, you have to take the 0,6mm wires. If you tried the 0,8 mm it's like you discribed, that the tubes are plugged or too tight.

Heiner
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Old Dec 05, 2005, 01:30 PM
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Bob,

Regarding the elevator linkage, after some frustration in getting the original supplied linkage to work, I went to the hobby shop with the original steel (piano) wire, and got one that's a tad thinner. Interestingly enough the one that comes with the kit is different from any they had at the shop (metric presumably).

I would imagine that the production version of the kit will have a bigger elevator snake plastic tube, so my problem presumably won't arise any longer. I have a certain un-easiness with control linkages that aren't 100% smooth, tight and slop free. The servos btw are HS-85MG x 3 .

Yes the Kokams 3200's will fit on the side of the fuse too. Keep in mind that the fg fuse is quite thin, and the Kokams will get hot.
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Old Dec 05, 2005, 01:54 PM
EDF Jet Jam May 2014
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But will they slide in with ease?

Quote:
Originally Posted by Herb
Bob,


Yes the Kokams 3200's will fit on the side of the fuse too. Keep in mind that the fg fuse is quite thin, and the Kokams will get hot.
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