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Posted by Herb | Oct 29, 2016 @ 09:19 PM | 1,328 Views
Started to look at the various pieces as the came out of the FlyFly box, it seems all the underwing tanks are missing.

Other than that, the kit seems in reasonable shape. I got it from hobby88.com (which is basically flyfly),



JePe's modifications are described in detail here :


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Posted by Herb | Oct 19, 2016 @ 01:11 PM | 2,191 Views
I got this kit some time ago from Dragon Hobby for $64 which is not bad, so I don't get all the extra junk I don't need.


Setup is a JetFan 90mm with HET 650 motor on 6S (3S+3S) 4000's , this is the setup I took out of that POS Freewing Fiat G-91 with atrocious ducting that always felt overweight, underpowered and never flew half right

Posted by Herb | Jan 10, 2016 @ 12:50 PM | 5,221 Views
Here's my latest fast foam project , a $99 FlyFly Mirage 90mm EDF




modified following (rather loosely) JePe's very detailed suggestions:



The model has been around for a while so here's a few useful threads talking about it:




I got the kit about a month ago, and did the maiden yesterday

I like to do most of the finishing & detailing work after the maiden, for obvious reasons

Below is what she looks like after the maiden

And here is a short video of the Mirage, I had to edit some parts out as the camera was on auto-focus:


Mirage 2000 by FlyFly 90mm EDF (2 min 14 sec)

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Posted by Herb | Apr 28, 2014 @ 01:14 PM | 22,193 Views
Here's my latest project, I picked this one up at a local HS (Rob's).

Like most Kyosho products it looks very well made


The specs are scale 1:7, 1.8m (71") wingspan.

Recommended engine size is described as 90 to 120 ...

(The original F4U Corsair had a wingspan of 41' or 12.5 m, which gives a scale of 12.5/1.8 = 6.94:1 : http://en.wikipedia.org/wiki/Vought_F4U_Corsair )

Here's a direct link to the Kyosho instructions (34 Mb) :


It has been pointed out to me that it looks very similar (if not identical) to the Phoenix Model Corsair (1.80m ws):


the slightly smaller BH Model Corsair (1.74m ws) :


and the even smaller Phoenix Model Corsair (1.49m ws)


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Posted by Herb | Sep 17, 2013 @ 08:07 PM | 19,000 Views
HTG MiG-15 (90mm EDF) 155cm (61") wingspan, a very nice kit! And quite close to scale

This thread in Italian or German



http://www.hobbyking.com/hobbyking/s...dProduct=24003 ($159 epo )



The MiG-15 with shipping cost me less than a pair of BVM molded MiG-15 wing tanks

Given the 155cm wingspan of the model, the scale is approximately 1008cm / 155cm = 6.50 :



Flight video added Nov. 17 2013, flies pretty fast but lands slow :


MiG-15 90mm HTG flyby (0 min 15 sec)


MiG-15 bis 90mm HTG (1 min 53 sec)
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Posted by Herb | Sep 11, 2013 @ 01:30 PM | 22,108 Views
I got this kit for $119 from the HK usa warehouse, not bad fro the price

I started putting some of it together while I am waiting for some additional parts.

Power setup will be a WeMoTec EVO fan on 6S 4000's.



It is / was sold as the "Hobbyking", "Proedf", "ProDesign" or "KMP" (Kondor Model Products) MiG-15 90mm edf.

Wingspan is around 1127 mm, length around 1124mm, expected weight rtf around 3kg.

Edit: short flight video added Oct. 27 2013:

MiG-15 90mm composite EDF (HK/ProEdf/ProDesign) (1 min 53 sec)

Posted by Herb | Feb 03, 2013 @ 04:18 PM | 6,778 Views
I ordered the new Dynam Me-262 from Nitroplanes a few days ago ... I got it in two days, and it took me a day to build and set up.

http://www.nitroplanes.com/60a-dy8950-me262-arf.html (I used a 5% coupon)








On the model the wingspan is 150cm, whereas the original Me-262 had a wingspan of 12.60m (http://en.wikipedia.org/wiki/Messerschmitt_Me_262), so that makes the scale approximately 12.6/1.5 = 7.9:1 .

The next day, Saturday, I flew it with the CG at 115 mm and it flew fine, it barely needed any trims. I use the recommended 4S 4000 setup and it flies well, plenty of speed for a foamie . My latest CG is now at 130mm (see picture below).

My nosegear steering lingage kept getting undone at the field, so I had to put a collar to prevent that Z-bend from slipping out.

The elevator and rudder linkages (pushrods) were really flimsy, I had to make the whole assembly a lot more rigid to avoid a possible catastrophy on the maiden.

Other than that, it flies like a charm

Edit : Short video clip :

Me-262 Dynam short video clip (0 min 55 sec)

Posted by Herb | Jan 26, 2012 @ 12:47 PM | 107,740 Views
The long awaited CMP (aka CMPro or China Models) Aero L-39 / L-59 Albatros 90mm EDF

http://www.chinapro09.com/OEM%20airplan/L-39.html is now out.

This thread in German

This thread in Italian

Given that the original had a wingspan of 9.46m and a length of 12.13m (L-59: 12.20m), whereas the model has a wingspan of 120cm and a length of 132cm, the scale is approximately 9.46m/1.20m = 7.9 :1 .

L-39 : http://en.wikipedia.org/wiki/Aero_L-39_Albatros



More info on the kit :







The retracts are exactly the same as the ones sold for the CMP / HK Hawk :


I got mine from RC Aerodyne and it arrived, double boxed with no damage.

ca. 75-78 mm from wing leading edge at root (see picture below)

Short Video of mine (April 2012) :

CMP L-39 (Hobbyking L-59) Albatros 1200mm EDF (5 min 52 sec)

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Posted by Herb | Dec 16, 2011 @ 06:15 PM | 62,527 Views
My new little project, a Messerschmitt Me-163 Komet, 61'' wingspan. It will be FAST

This thread in German

Some basic info on the Me-163 Komet rocket interceptor can be found here : http://en.wikipedia.org/wiki/Messerschmitt_Me_163

The original Me-163B had a wingspan of 9.33m, which makes the model roughly 1:6.1 scale.

Most likely the paint scheme will be "yellow 15" kept at Raf Cosford.

The model itself is the so-called "Flyboy Models" or "BH Models" 0.60-size Me-163, 1540 mm (61'') wingspan,

and is made by CY Model : http://www.cymodel.com









Edit : Me-163 short video March 2012:

Me-163 Komet 60-inch RC (FlyBoys) (2 min 5 sec)

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Posted by Herb | Oct 13, 2011 @ 06:29 PM | 37,693 Views
Once in a while an EDF fan comes along where there's plenty of measured data to evaluate how good it is ...

Here's some nice and complete systematic data for the new 90mm JetFan :


Of great relevance of the overall fan efficiency, defined as

efficiency = (mechanical work done per unit time) / (input power) , in e.g. (N.m/sec)/Watts

A good substitute for the above quantity is, based on simple formulas relating work to fan thrust and fan efflux:

efficiency = (const.) x thrust^(3/2) / (input power)

You would imagine that if somebody is really serious about designing an efficient fan they would take the time to actually do relative measurements of different designs, in order to figure out which rotor/stator design in the end is best.

Indeed that is how serious fan designers (eg WeMoTec, Daniel Schuebeler etc.) indeed do it ...

But then often a new design comes up (nowadays every other week, in some cases a copy of somebody else's rotor, with one blade added or subtracted so it don't look like a copy ) - without any clear measurements of anything.

If it is a clear shameless copy of a DS-51 fan, then it has to be as good as the DS-51, right ?

Then the relentless overhype follows ("20% more efficient than anybody elses fan'" - to the point that now the overall efficieny adds up to 110% ), and more adverts such as "best fan I ever tried in my xx" etc.

Now, the Jetfan 90 data is interesting and accurate enough to pull out :

1) the relative efficiencies of different motors in the JF

2) the very slow rise of efficiency with power/voltage

3) the large errors inherent in all these measurements

4) the wide spread in motor efficiencies (up to 31%).

Posted by Herb | Oct 02, 2011 @ 01:29 PM | 28,281 Views
Last month I had a chance, while spending some extended time in Paris for work, to visit the Air and Space Museum in Le Bourget.


The museum is located within a large airport in the Bourget suburb of Paris, and is the site the Paris Airshow (which takes place usually in June).

It has an amazing collection of - what else - French (mostly Dassault) jet aircraft, including some weird looking experimental aircraft, but also Montgolfieres, some very early 20-th century planes (Bleriot), some very nice WWII warbirds (including a FW-190A and a Spitfire Mk. IX) and two Concorde.

A Visit to Le Bourget Air and Space Museum (2011) (3 min 14 sec)

Rafale A:

Posted by Herb | Jul 24, 2011 @ 01:50 PM | 8,411 Views
I've had this Spitfire for a year and a half now, been flying it since last October 2010 ... It has become one of my frequent fliers



Initially I didn't do much to it as far as appearances, looked pretty good out of the box (my wife commented that it was my best paint job ever ) so I just flew it ... The large MiG-21 kept me busy with paint etc.

After almost a year of flying and probably 100+ flights, I decided to play around & practice with the airbrush a bit.

Posted by Herb | Apr 02, 2011 @ 01:48 PM | 82,416 Views
Started to look at the various components last week ...

This thread in German

It's a big all fg-airex-sandwich carbon composite airframe for twin 90mm fans, made by Airworld Germany;


the rest of the components, well you can guess where most of them (esc, batts) will come from ...

Edit : Me-262 flyby added March 2012 :

Me-262 Airworld (twin 90mm edf) flyby (0 min 18 sec)

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Posted by Herb | Nov 09, 2010 @ 07:05 PM | 277,793 Views
I just received this new CMP / CMpro T-45 arf, I have the CMP Spitfire and I like it ...

This thread in German or Italian

It is almost identical to the Hobbyking Hawk (also made by CMP or China Model Products : http://www.cmpairplane.com/ ) up to the paint






The Spit is a bit on the heavy side , but it seems now this Hawk is made relatively light(er) ...

The wing area on the T-45 is 24dm^2, so that makes the wing +33% larger in surface than the Sapac T-45.

Wingspan = 114 cm = 46 ''

Length = 122 cm = 49 ''

Wing area = 24 dm^2 = 372 sq in

Approximate scale 1:9

Est. weight rtf 7.2 - 8.0 lbs

ca. 110-115 mm from wing leading edge at root (see picture below)


Short video (8S, HET fan) Dec. 2011 (more T-45 videos on youtube under user "Herbzqy" )

T-45 Goshawk 90mm EDF by CMP (Neu 1515 on 8S) (3 min 0 sec)

Short video (6S, WeMoTec fan) Nov. 2011:

T-45 Hawk 90mm by CMP (BAe Hawk) Aerobatics (3 min 22 sec)
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Posted by Herb | Aug 22, 2010 @ 01:22 PM | 6,659 Views
Two friends at the field (Art and Don) already have one of these, they fly pretty well, the only changes on theirs was the fan and 3x good sized metal gear servos for the retracts.

I got the F/A-18 airframe only (with plastic wemo-copy fan & mechanical retracts).

Built it Thursday and Friday night and flew it twice today (Sunday) .

I use three metal gear Hitec HS81 servos for the retracts & moved the twin elevator servos under the fins.

The mech. retracts on mine seem to work fine so far, after patiently taking care of all the little mechanical adjustments.

I use a separate beefy 800Ah JR receiver battery.

I tossed the included BananaFan (cheap plastic WeMoTec copy) and used a WeMoTec Midi pro instead with a $19 HC B36-55 kv=1800 inrunner motor on 6S 3300's : https://www.rcgroups.com/forums/show...pp=100&page=13

These motors are now on their second year of flying in the Midi...

Mine weighs rtf on 6s 3000's (Turnigy 40C) 77.5 oz = 4.84 lbs = 2.20 kg , with ca. 1600W.

Guy H took these very nice inflight pictures with a Canon 7D. Thanks Guy

Posted by Herb | Mar 24, 2010 @ 02:47 PM | 58,680 Views
Just started my latest scratch build project, a 1/8-th scale MiG-21 MF (Fishbed J) EDF for a 101mm fan.

This thread in German

So far I managed to find some time to patiently cut out all the fuse formers and trial fit the fan ...

It will eventually be powered by a Neu 1515 motor in a 101mm fan on a 9S 4000 setup; depending on final weight (< 9 lbs) power will be in 3.0-3.5 kW range.

Inspiration for the MiG-21 project came from another avid edf-er JC (Bidule),


I found this particular plan on e-bay:


The plan is nice and seems very well made ... will know more about the quality after the MiG has flown

Edit Jan 7 2011 : Video of the second flight of the MiG-21:

MiG-21 MF (Fishbed J) 100mm EDF (4 min 4 sec)

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