EJF / Fly Fly MB-339

[CRCJA]

So I have owned four different MB-339's before, but they where all turbine. One from DL Aeromodels in Canada, one from ANK models in Torrance (no longer in business) and two from Tam/Cermark. When rumors about The Fly Fly MB-339 came out, I knew I would probably end up getting one.

The plane came nicely packed as usual. This time is has panel line and some rivet/fastener detail include.


Ralph

[CRCJA]

I comes with a Detailed picture building/instruction manual as usual Fly-Fly style. Constructions per the manual begins with the Nose, but you can start almost anywhere.

[CRCJA]

Now let’s move on to some decisions, Do you use the Stock Fly-Fly fan (included) with the kit or use your own. I elected to go with the Lander 90 mm fan, which will require some modifications to the plane but I will also not able to use the included thrust tube.

In Regards, to Retracts, you are in the same boat as the fan. People have expressed interest in the HET and the Spring Air. So I will also make my build with Spring Air which again will require some modifications.

Ralph

[CRCJA]

For the most part, servos are glued into the flying surfaces, The plane has pockets for small servos, but All I had at the shop where Futaba 3102, so that is what I used for Elevators and Ailerons. Each Elevator half has it's own servo as do the Ailerons. I had to enlarge the servo pockets to fit my needs (or what I had available)

The Vertical stab does not have the rudder cut off, But if you want a rudder, you can easily make one yourself.


Ralph

[Sid3ways]

Since this is the exact gear I want, please make sure not to glue the wings on to make it easier to ship it to me. :) Great work, I can't wait to see it fly.

Why don't you just build a 2nd one right next to it while you are at it. ;)

[AceMigKiller]

Lookin' good Ralph!
Only thing that semi-concerns me is that landing gear mount... if it were mine I'd definitely dig in some hardwood rails a few inches each way to supplement that neat metal mount.

Vic

[CRCJA]

Vic,

They improved the mounts since the F-4 so it has a little more bite. The metal frame/bucket/support if used get's glued to the Side and bottom of the gear mount, plus the wood support where the screw go in. So I think it has more Bite at least compared to the earlier planes if used per supplied gear and instructions. BTW I just came back from EJF and he still has a couple more 339's in stock

Ralph

[lavochkin]

Nice!!!!! I didnt know it had cheaters on it though!! :confused: :(

[CRCJA]

It was a little Hot today, so I spent most of the time in the house working on small parts for the Sniper 90, you can look up that thread on the Ducted Fan section. Page 38 and 39

http://www.rcgroups.com/forums/showthread.php?t=1050341

I also worked on the MB-339. I built the new trust tube, I didn't have Millar laying around so I used an old poster they had thrown away at the office, It was laminated, so I figured it would make perfect material for Thrust tubes.

Run all your extensions through the body of the plane but make sure you leave enough slack to remove the servo if you ever need to. Today was spent centering servos and testing RX etc. Right now I am waiting on some retracts that I traded with from Bob Ruff before I can finish the wing.


Turbulence

[flanker]

Is the wing removable for transportation?

[CRCJA]

The wing comes off by removing a couple of screws.

Ralph

Is the wing removable for transportation?

[Socomon]

Ralph:

How much different would you say the foam really is from the previous flyfly models? Is it a huge difference?

[ditchit]

It's EPO so it's gotta be big time different. EPO doesn't tend to have a perfectly smooth surface though and it's never been a great idea to glass it so would be interesting to see some close up pictures.

EDIT: Actually if you look at the 2nd pic above it's got a typical EPO finish.

..and that's why in this pic the lines aren't exactly sharp. Not that it'll notice in the air though.

http://www.rcgroups.com/forums/attachment.php?attachmentid=2636662

[Socomon]

In that photo it looks a lot like the Elapor from the Multiplex planes. If it is as tough as Elapor, that would be pretty good.

[ditchit]

EPO is same as Elapor. Multiplex has had this type of foam to themselves for far too long.

[Socomon]

That is pretty awesome then. EZStars are tough to kill.

[flanker]

Just ordered one with HET retracts and HET 90mm fan :D wooohooo

[Socomon]

Just FYI - the HET 90mm fan is very hit or miss as far as getting it to run smoothly. They have some problems with their collets.

I think the HET retracts are probably on the borderline as far as being able to handle the weight of these 90mm planes.

[david hardy]

If you look closely at the 1st photo in post no1 the box top clearly says MATERIAL- STYROFOAM no mention of epo. Im disappointed too!! but dont want anymore high priced burger box models. :(

[TheSkylineFlyer]

Mine should be arriving tomorrow!!! :D

[Sid3ways]

If you look closely at the 1st photo in post no1 the box top clearly says MATERIAL- STYROFOAM no mention of epo. Im disappointed too!! but dont want anymore high priced burger box models. :(
Apparently you read absolutely none of the thread. How can you possibly miss the fact that someone is BUILDING the plane in this thread and states it is EPO. That first picture is the actual boxed airplane that CRC is building now. :rolleyes:

[david hardy]

Sid3ways - must come back at you on that i had read the whole thread and nowhere i can see does CRCAJ (Ralph) say what foam this kit is made from the first mention was post#13 there Ditchit says its EPO but he doesnt have the kit. So lets ask Ralph (CRCJA) what its made from ?? just to clear this misunderstanding up as the Box top specification does say Styrofoam. EPS. :confused: Dave

[Socomon]

The foam in the photos looks very different from the foam the f-86 or Bae Hawk is made from. I have both of those. The foam in the photo looks more like Elapor type foam which I am familiar with from Multiplex models. Rovert from EJF has confirmed that the 339 is EPO.

[ditchit]

I saw pics on another thread where it clearly stated EPO on the box. RC-Castle put it on their site as EPS. I emailed them and they checked with FlyFly who confirmed it was EPO. Believe what you want.

http://www.rcgroups.com/forums/showpost.php?p=12584298&postcount=26

http://claregrace.brinkster.net/rc/1.gif

[CRCJA]

On the "Coming soon thread, they (EJF, Fly-Fly, etc.) settled the argument about the type of foam. You can read all about it on the other thread:

http://www.rcgroups.com/forums/showthread.php?p=12584298#post12584298

This is stonger/tougher than the usual Fly-Fly planes, I should know, I own the F-86, Hawk, Mig29, and of course the F-4, I guess I need to get the Mirage next :)

Anyway, I was my Spring Air's where old and dirty, so I traded with Bob Ruff (Trader Bob) for some Yeah Racing retracts. so that slowed down a bit of progress, I read the 30 page wemo thread about the Medusa motor, etc. I ordered the a Medusa 3660-1500-5 V2 so it got mailed from Medusa yesterday (Friday).

I made new retract mounts for the landing gear and finished up the wing, I left/added an extra extension cord for the Future in case I decide to add flaps.

Turbulence

[CRCJA]

Elevators all done and ready to be mounted.

Turbulence

[-PaX-]

Any updates on this bird? :)

[CRCJA]

Sorry Pax, my computer had a failed hard drive and the Raid did not want to rebuild, so I bought two more and started fresh, has taken most of my time, anyway, I also have been playing with dolls, err I mean action figures, I just can't have a scale, sport scale, or way off scale plane without a pilot, so I tried the ones I had and they where too small. J I Joe to the rescue, I purchase a Figured called Ripcord which is a pilot on the moviw, looks close enough.

Finished off the cockpit and added a piece of wood to the back of the canopy. Since the hatch latch attaches to the plastic, I had the plastic rip/tear on me on the Fly-Fly F-4 so this time I added the wood support from the start. You can make it smaller if you like, as long as it helps support the canopy. I also got my new Medusa Research Motor and that is mounted to the Lander Fan, Started to modify the wire struts to fit the standard oleo struts that came with the kit.

Ralph



Any updates on this bird? :)

[CRCJA]

Since I don't have any fancy tools, I have to go old school, Grind the strut down with a dremmel. I hope to finish the plane by this weekend


Ralph

[gooseman]

gents

got mine at 1.30 pm had at finished at 8.30pm

just decals and tanks to install

setup is
mg servo's all round
lander fan and motor installed
turnigy plush 80amp esc
flightmax 6s1p 5000 25c pack

wll maiden tommorrow

Grant

[TheSkylineFlyer]

What servos is everyone using?

[lavochkin]

Hitec Hs-82 mg's or hs-85mg's are the best. All my fly fly jets use them with no problems. Full size servos are too large.

[AceMigKiller]

gents

got mine at 1.30 pm had at finished at 8.30pm

wll maiden tommorrow

Grant

Nyyyyyyce!!!
Good luck on the maiden and of course let us know how it goes! :cool:

Vic

[ditchit]

Nice job Grant...gonna take some vid?

[ScYcS]

I know this is the EDF forum but seeing this bird reminds me big time that i want a company offer a kit for the Aermacchi SF.260....sadly, it seems there are none (well at least none in the size i want it in.....SMALLER than 70" wingspan lol).

[flanker]

Wow! that was fast. I am scheduled to get mine today. But I won't be able to build it as fast.

gents

got mine at 1.30 pm had at finished at 8.30pm

just decals and tanks to install

setup is
mg servo's all round
lander fan and motor installed
turnigy plush 80amp esc
flightmax 6s1p 5000 25c pack

wll maiden tommorrow

Grant

[Jet Dreams]

I think I see a cheater hole, is this correct? I hate cheaters :mad:

Any maiden flight reports from here?

[AceMigKiller]

I haven't seen this bird in person yet.
It does appear to have a cheater on the bottom though... Luckily it looks pretty easy to cover up. You should still have way more than enough air coming in through the primary intakes.

Vic

[CRCJA]

Well I seem to suffer a couple of set backs again. While is still HOT out here, the build continues. I didn't plug in my programming card right on my HET 100 ESC so, I burn up the card, no way to program the Speed controller now until I get a replacement, to make sure the build continues, I resorted to use an HET 75 that I had in my shop.

Because of the fan and Motor I used, I saw no practical way to place the ESC where the plans called for, so I enlarged the opening on the top of the fuselage and ran the ESC where the servo leads go.I didn't feel confortable running the cables with the connectors my be touching the Metal Fan housing. My last major hurdle besides the heat is the Front nose retract and steering, so I see my plane getting done this coming weekend.

Ralph

[Madmax1965]

I have built a few of the Multiplex planes (Evapor foam) and the use of epoxy is not reccommended.....use CA only on Evapor foam. If this foam is the same as the Multiplex foam then epoxy will not hold. So what does the instructions say to use?

Cheaterhole? What is the problem? When the plane is on the ground you can't see it.....when the plane is in the air you still can't see it.

[lavochkin]

Says the man holding a Byron jet. LOL!!!!!!

[Madmax1965]

Well as for cheaterholes everyone has one...some are larger than others....LOL!!!! :D

Anyone can answer if regular CA is used on this plane or will epoxy work?

[Socomon]

While epoxy was not the suggested adhesive in the Multiplex manuals, I can tell you from experience that it does work fine on Elapor. As I understand it, there were a couple reasons Multiplex did not recommend epoxy:

1) The epoxy used in Europe is different that what we buy in the states and some of it is not foam compatible.
2) weight.
3) CA is fast and easy.

[AceMigKiller]

Epoxy does bond Elapor okay... but the problem is that it tears away from the glue joint pretty easily. I epoxied the motor mount onto my Parkmaster when building it, only to watch it separate while hovering... it was pretty funny to see though! :D

CA tends to "fuse" (not literally, but you get the picture) the foam together and holds really well. And it is faster and easier to use, especially with kicker.

I'm not saying that epoxy is a no-no, just my personal experience. I wonder if there's any scrap pieces of foam in that kit we could get Ralph to goof around with???

Vic

[Madmax1965]

Epoxy did not work well on my first Multiplex plane(the wing came loose).....I used regular (not foam safe)CA on the other three Multiplex models and nothing came loose. So I take it this plane would use CA. I just ordered one of the MB339 to play with.

[Socomon]

Personally - I have used Gorilla glue to build my FlyFly planes. Very strong and light and it expands to fill gaps. Sandable and paintable too.

[TheSkylineFlyer]

I finished mine. Went to maiden it yesterday and forgot the series plug!!! :mad: That would have meant a 35min one way home and then back out. Probably next week I'll get to fly mine.

[AceMigKiller]

Doh!
Can't say I've never done that... :o

[gooseman]

Guys,

this is not the same foam as multiplex kits it is similar with big beads of foam but personally i dont think it is the same.I would be hesistant t use CA on it and i hav used 5 Minute epox in all high strength places and uhu-por for all others. I believe it will be fine, will be able to maiden it this weekend coming

Gooseman

[TheSkylineFlyer]

Oh good. I was afraid that I might have messed this up. I used 6min epoxy on everything. :eek: Foam safe CA should be okay with this stuff though as its the same foam that the Hobbyzone Supercub is made of and I have used foam safe plenty of times on that plane.

[TheSkylineFlyer]

Doh!
Can't say I've never done that... :o


Tell me about it. As I don't have 6s lipos, I was going to use a friends 3s and run them in series. I feel real bad making him meet me there too. :(

[Madmax1965]

If this is the same foam as Multiplex uses then regular CA works great. I will see if I can find as piece of foam off my plane when it arrives and try regular CA on it. I can tell you epoxy did not work on my Multiplex plane.

Maybe it is time for someone who sells or maunufatures to settle the question on which "glues" to use.

[Socomon]

I finished mine. Went to maiden it yesterday and forgot the series plug!!! :mad: That would have meant a 35min one way home and then back out. Probably next week I'll get to fly mine.

I arrived at the field once set up my airplane and opened the tranmitter case only to find out I left the transmitter at home on the charger. Drove the 30 minutes home, got the transmitter, dove 30 minutes back to the field (pretty aggrivated by that point), then proceeded to crash the airplane. :censored:

[TheSkylineFlyer]

I arrived at the field once set up my airplane and opened the tranmitter case only to find out I left the transmitter at home on the charger. Drove the 30 minutes home, got the transmitter, dove 30 minutes back to the field (pretty aggrivated by that point), then proceeded to crash the airplane. :censored:


LOL. Don't mean to laugh, but they way you put it, its... sad and funny at the same time.

Its probably best to reason that when this type of thing happens, that you should just walk away.

I went to fly one time and was having problems with the plane that I was about to fly. Proceeded to take another one out of my truck and put that one into a tree. :rolleyes:

[flanker]

I started building mine but I haven't used regular CA. I have only used foam safe CA to bind couple of wood pieces. I haven't had good experience with CA (foam safe or not) with foam models. I prefer something that is flexible. I have used hot-melt glue and GWS type glues in the past. But each glue has its own trade-offs. On this one I have been mostly using Gorilla (fast curing) glue, hot-melt glue, and some foam safe CA.

[anthodenn]

I arrived at the field once set up my airplane and opened the tranmitter case only to find out I left the transmitter at home on the charger. Drove the 30 minutes home, got the transmitter, dove 30 minutes back to the field (pretty aggrivated by that point), then proceeded to crash the airplane. :censored:
How did it crash? What happened? :confused:

[Socomon]

I had an issue with fake Deans connectors that pulled apart too easily. The weight of the Eagle Tree unit caused the connectors to seperate in a dive and I lost all motor and radio control at about 200' and 100+ mph.

Made a heck of a divot. :cool:

[anthodenn]

100+ mph! :censored:...
You goin to get another one:confused:...

[Socomon]

That was an HET F-20. No plans to get another just now.

[CRCJA]

Don’t get it twisted; he didn't crash an MB-339 just telling a story.

Back to the 339, so I pulled out the fan yet again, routed the lines where they where called out in the manual, unpractical as reported earlier, maybe but that is just because I have a different fan mounted and I had to cut out a new channel/hole to route the cables. I did it because I want to run 8S on this bird and once I get the other ESC and programming card, it makes it easy and faster to replace the ESC.

EPOXY: I used 15 Min epoxy on the rear joint and the forward to rear fuse joint with no problem. I tested it on the scrap pieces I was cutting out first and could not separate unless I chopee the foam, so Epoxy is good ( it just dries about twice as fast here in the heat :) )

I am just down to the nose gear steering and It's ready to fly


Ralph

100+ mph! :censored:...
You goin to get another one:confused:...

[anthodenn]

Oh :o you scared me for a minute there.

[TheSkylineFlyer]

My video of my maiden will be up on Youtube in about 28:06 minutes. :p :D

[TheSkylineFlyer]

HERE IT iS FoLkS!!!!


http://www.youtube.com/watch?v=Yic-sJ1jcvg

[Sid3ways]

Video is not yet processed, error. :(

Works now. :D Going to watch it in a bit. HD - Nice! :)

[Madmax1965]

Skyline what is your setup/weight?

[TheSkylineFlyer]

Have not weighed it.

Setup is:

90mm RCLander 6s fan and motor
Hextronik 80A ESC
5 Hextronik servos, 1 9Gram HXT900 and 4 MG14 (metal gear)
1 Hitec MG 82-MG for air retracts
Flyfly retracts
AR6200

Lipos: Subject to change.

3s2200mAh 30c x4 Two in series and two in parallel.

[lavochkin]

Seems to fly well!!! It looked like the wings were flexing pretty well in a few shots there. Did you reinforce the wings with any carbon rods?
I wonder how well it would fly on an 8s midi/neu setup at 2,500 or so watts?? Could ya fit 8s 5000mah lipos in it? It flew very well on the 6s setup.
Nice vid!!

[TheSkylineFlyer]

I was thinking the same thing on the flex. It already has CF in the wing. Maybe more is in order?

If the 8s setup was divided into 2 packs and you organized your wires better than I did, I think that it would work. It was a tight fit thanks to the contour of the seats in the cockpit. The cockpit could use some reworking and that would make this alot better.

[TheSkylineFlyer]

Don't forget this is a 55" WS Foamie. Not only a foamie, but a EPO foamie.

[Socomon]

This airframe could be different, but I tested my FlyFly F-86 recently by dropping a cell (about 500W less), and there was almost no difference in speed. The airframe pretty much maxed out around 1300W before serious diminishing returns.

[AceMigKiller]

Lookin' good, lookin' good!!!
But I agree... this thing needs 2kw+ :D :D :D
Oh, and maybe some better spar construction, but nothing CFR, Glue, and about 15 minutes can't take care of! :cool:

Vic

[TheSkylineFlyer]

Is that the HET motor? Is it more powerful than the RcLander setup?

CFR will definitely be looked into before the next flight. Glad you liked it. Now go give me my 5 stars! :mad: j/k :p :)

[TheSkylineFlyer]

Vic,

They improved the mounts since the F-4 so it has a little more bite. The metal frame/bucket/support if used get's glued to the Side and bottom of the gear mount, plus the wood support where the screw go in. So I think it has more Bite at least compared to the earlier planes if used per supplied gear and instructions. BTW I just came back from EJF and he still has a couple more 339's in stock

Ralph


I left the metal supports out as they pinched the side of the plastic Flyfly retracts and kept them from opening after retracting them.

[flanker]

I haven't noticed any CF in the wings where do you have them in the wings? Did you add it yourself or did it come with it? Any pics?


I was thinking the same thing on the flex. It already has CF in the wing. Maybe more is in order?

If the 8s setup was divided into 2 packs and you organized your wires better than I did, I think that it would work. It was a tight fit thanks to the contour of the seats in the cockpit. The cockpit could use some reworking and that would make this alot better.

[CRCJA]

Flanker,

The carbon rod is thin and installed vertically on the bottom of the wing. You can see part of it here on the photo.


Skyline,

Great job on the maiden, mine should be flying very soon too.

All,

This is the largest of the Fly-Fly planes so far.


Ralph

I haven't noticed any CF in the wings where do you have them in the wings? Did you add it yourself or did it come with it? Any pics?

[Madmax1965]

I want to try using A-123s in the plane if there is enought room and the weight is not too much. Reason? The A-123s can be recharged fast, are very safe and last for years(I am flying a pack which is 3 seasons). Also the A-123s are mounted permanent and are recharged through an outer charge jack.

[TheSkylineFlyer]

Skyline,

Great job on the maiden, mine should be flying very soon too.

All,

This is the largest of the Fly-Fly planes so far.


Ralph


Thanks Ralph! Your going to love this plane.


Make sure that before you install the wheels, make sure that the two halves of the rims are glued together. On my second flight, I came down nice and easy as the first landing, but upon my mains touching down, the right main wheel popped off. I saw the foam wheel go flying off and part of the rim. Upon inspection, I found that what happened was the the two halves were not glued together and the compression of the foam wheel popped the two halves apart and then one half of the rim and the foam wheel went flying off. The other part of the rim stayed on the gear, but as it started to hop down the runway, the hopping cause the rim to shatter. :mad: Good thing I have my F-86 wheels. I just swapped it out.

[TheSkylineFlyer]

I want to try using A-123s in the plane if there is enought room and the weight is not too much. Reason? The A-123s can be recharged fast, are very safe and last for years(I am flying a pack which is 3 seasons). Also the A-123s are mounted permanent and are recharged through an outer charge jack.


What A-123's would be equivilant to a 6s 4400mAh 30C lipo? I don't quite understand how to do the math to get the same power. Also, would I need a new ESC, one for A-123's?

I have to say, leaving the packs in the plane sounds really tempting.

[Madmax1965]

Skyline:
What A-123's would be equivilant to a 6s 4400mAh 30C lipo?

A 6s2p A-123 pack is 4600mah and 50C....more weight as the pack would weight 2lbs.
As for the extra weight I was told the MB339 could handle a two pound pack. If this is true this plane will be a great setup using A-123s. I intend to find out.

Also, would I need a new ESC, one for A-123's?

No you would not need a new controller just set the cut off voltage to 2 volts per cell as the A-123 cells are 3.65 when fully charged....lipos 4.2 volts.(be sure if you change out for the A-123s to lipos that you reset the controller to the lipo cutoff voltage or you will have BIG problems.) The 6s2p pack would give you 21.9 volts. I fly a Sebart Sukohi 50E(61"wingspan)plane on the 6s2p A-123 and it flings the plane around the sky with vigor. I get 8 minute flights with a 1 minute landing time....and can recharge in 10 minutes @ 20 amps.

[TheSkylineFlyer]

Next question Madmax. Where would I buy that configuration already made?

[Madmax1965]

Tanic. They make really nice packs....cells are tab welded. I have been using the Tanic A-123 packs for many years now.
You might want to wait and see how my MB339 weighs out first....up to you. I found the brick config is the best for constructing the packs. Tanic has the packs listed as 19.8 volts but a full charge will be 21.9 volts....I actually set my power supply to charge the packs to 22 volts. Some flyers charge the cells to 4 volts......this way you don't need balance taps as the cells will settle and balance out. 4 volts per cell won't hurt the batteries but I would always have balance taps on my packs.

I use a MAstech power supply to charge my A-123s(Tanic sells them too)but you can use any charger which will do A-123 cells. You can choose your balancing taps and wire plugs. You will be using the 2300mah batteries in these packs. The 1100mah A-123s make great onboard packs. You really can't hurt these batteries unless you over charge them too high voltage....then the safety end caps will pop off.....no danger there but the battery will be ruined.

http://www.tanicpacks.com/

https://www.tanicpacks.com/product_info.php?cPath=111_120_99&products_id=744&osCsid=aa1381fa5770e515c4bc223930dc9a19

[flanker]

Ralph or Skyline,
Did you reinforce the wings with CF rods or anything else? Does the wing seem strong enough? My build is coming along but slowly due to lack of build time. Finally got my motor yesterday so now I have pretty much everything I need to get it built.

[TheSkylineFlyer]

I have not done any reinforcement as the wings already have them. It does flex, but I'm not planning on doing any hard G's. But I might down the road.

[AceMigKiller]

...but I'm not planning on doing any hard G's...
PFFT!!!!!! You ain't flyin'... ;) :D

[Socomon]

Yeah - save the high Gs for your composite and built-up models. It is not what these FlyFly models are good at.

[flanker]

Neither am I (high Gs etc). I just want this one to be moderate speed nice / relaxed flying jet. I have others that do a good job of keeping my heart rate while in the air.

[TheSkylineFlyer]

Then you won't need to do any mods to it then. Its perfect just the way it is.

[TheSkylineFlyer]

Lookin' good, lookin' good!!!
But I agree... this thing needs 2kw+ :D :D :D
Oh, and maybe some better spar construction, but nothing CFR, Glue, and about 15 minutes can't take care of! :cool:

Vic


:cool: Yeah...

[TheSkylineFlyer]

Lets get more vids out there guys.

[Madmax1965]

Finally received my MB339. A very big foamie. Plenty of room for my A-123 6s2p pack but I might have a problem locating the pack to have the correct CG....but maybe not. I am not too sure about the landing gear.....sort of lacking.


Power will be a Scorpion HK-3026-1900kv running on 6s if I use the A-123 or 8s if I use lipos. The plane is very light in weight so if the A-123s fit there should be no problem as to weight.

[Socomon]

Finally received my MB339. A very big foamie. Plenty of room for my A-123 6s2p pack but I might have a problem locating the pack to have the correct CG....but maybe not. I am not too sure about the landing gear.....sort of lacking.


Power will be a Scorpion HK-3026-1900kv running on 6s if I use the A-123 or 8s if I use lipos. The plane is very light in weight so if the A-123s fit there should be no problem as to weight.

Why would you use a higher count for Lipos? 1900kv seems awfully hot for an 8s lipo. These FlyFly planes can't really make use of that many watts in my experience.

[Madmax1965]

Because that is what I have as for lipos.....either 4s or 8s........but I will more than likely use the A-123s anyway.

A work in progress...so what are you powering your MB339 on Socomon ? Do you see problems @ speed on this plane? I don't see a problem with the wings being weak if you use carbonfirbe rods to beef them up.....

[Socomon]

I have the Hawk and Sabre, but no 339 as yet. In both those planes I used C/f in the wing and stabs per ExtremeRCs suggestion.

[Madmax1965]

This plane is a little different than prior Fly Fly planes. Better and stronger foam and I believe the design is better except for the LG. I would have no problem flying this plane @ high speeds if the wings are reinforced. The weak spot on the wings are @ the point where the bottom panel is glued in. The main part of the wings seems fine but I will run the CF rods on out to about even with the aeliron servo. All in all this is a nice looking plane from about 10 feet away....better than most foamies.


I would like to paint this plane in a different color but don't know which type of paint I would use. I do know that alcohol will remove the paint which was used on the plane so I am guessing it is water based. The problem with Evapor is that not much of anything sticks very well.

[Socomon]

I wouldn't have a problem flying at high speed but it takes some serious watts to get there. there is a real diminishing return on watts-in after a certain point. On the other planes it was around 1300W. This airframe looks equally draggy.

[flanker]

I am almost done with my build but unfortunately typically the easiest step of the build has become the hardest. I can't seem to be able to figure out how to mount the wing and keep all the wires and retract lines out of the way from the fan and getting sandwiched between the wing and the fuselage. There doesn't seem to be much space to route wires or have them get tucked in when the wing is mounted.

How has everyone dealt with this issue. Any pics would be greatly appreciated. I want to keep the wing easily removable for transportation but so far it has proven to be a chore.

[Madmax1965]

Flanker......I can see where you could have a problem. I didn't install retracts on my plane(but may do so later)but I figured the lines could be glued,taped or zip-tied...or maybe even cut a channel in the foam to the top of the fueslage and so be out of the way when installing the wing. I don't want wiring hanging down in the way each time I need to put the wing in place. In my case I would only have the motor wiring. I probably won't be removing the wing very much as I can travel to the flying field with the wing in place.

I will fly the plane as is except for putting CF rods in the wings. I probably will install different LG after a few flights if I feel the stock gear is not working out well. Too bad the Evapor can't take paint too well as I end up with blue fingers each time I handle the plane.

I didn't like the way the fuselage pieces were connected and I wish I had added a few carbonfibre rods at the connection point for strength.....maybe all will be well as is.

[Socomon]

FWIW - the servo leads, etc are kind of a pain on the Hawk and Sabre as well. On the Hawk, I kinda ended up with them just smooshed between the wing and the wing saddle, but they kinda press themselves down into the foam and seem to be OK.

[Madmax1965]

Socomon:

I kinda ended up with them just smooshed between the wing and the wing saddle

Yep looks like that is what I will do on this plane. The foam is soft enought to accept the wires and I will not be removing the wing very often so this should work.

I noticed one wing has a small carbonfibre rod glued in......the other wing had no rod....it was missing. :confused:

[TheSkylineFlyer]

FWIW - the servo leads, etc are kind of a pain on the Hawk and Sabre as well. On the Hawk, I kinda ended up with them just smooshed between the wing and the wing saddle, but they kinda press themselves down into the foam and seem to be OK.


I did what you did. Then after it smooshed the foam, I cut that section out of the foam to form a small pocket for the wires to go.