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Sep 01, 2003, 09:27 PM
Ado's Avatar

Which airfoil to make an AMD SU-35 to fly?


I purchased an AMD SU-35 a while back, despite peoples recommendations not
to buy it....It's a cool plane...who could resist :P

Anyway...I want to get this thing flying(its nearly flying session
again!) I have devised a cunning plan...that needs a little help. =]

I have removed the wing and that ever so heavy sold fibreglass rod and I
plan to replace them with a carbon fibre arrow shaft and a blasa skinned
foam core wing. I have found a place locally that can CNC the wing for me
and I can do the rest.

The thing I need help with is what profile wing to use and what dimensions
etc. Here are the current dimensions of the wing... .The root is about 18mm(25mm to an inch)
thick at the biggest point and the wing tip is about 7mm thick. I wouldnt
have a clue what the profile is....they all look the same to me eheh.
Actually, I just looked it up, its a MH-22. Never heard of it :P

Well then, now for the good part. What to use? =]

I was thinking of the old trusty RG-15 or RG-14...but we have to consider
how draggy a jet fuse is like and put that in to consideration? Apart from
those 2 popular profiles I seriously have no clue. Dimensions, well to keep
things looking semi scale I think the root thickness should remain the
same, same as the sweep, but overall wing span can grow some(50-100mm..or
more if you think it needs it) to get better lift/performance. Also,
washout can be included?

So far the fuse, stabs and elevator weigh 200g. No servos, receiver or
battery included yet. The fuse will require a little work aswell from a
couple cracks and the fuse is a little weak in places and will need to be
stiffened with carbonfibre or a couple formers.

I hope thats enough information to be able to get this "plane" flying the
way it was meant to. =]

Thank you for your time!


Adrian Mallett (Australia)

ps: This was sent to the ISR email list...sorry to those that have read it already.....more coverage the better I spose
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Sep 01, 2003, 10:57 PM
Registered User
mattg's Avatar
I think either the RG14 or 15 would be okay choices, just how oweight do you think the plane is? Both of those will work well with a plane that's flown fast most of the time; esp the RG14 will want to be flown fast.

MH32 seems to be pretty popular and might be a bit more of an all-round alternative.

It looks like a nice kit and I saw a review in S&E Modeler that seemed to say it flew okay. What have others said that's so bad?
Sep 01, 2003, 11:07 PM
Ado's Avatar
It never flew to specifications when I tried to fly mine......a member from ISR also could never to get his to fly either....I have heard other reports of varied success.

I think the main issue is the cockpit part of the fuse is very weak and flex alot during flight which is causing the front canards to reduce performance.

I dont think the model is over weight but weight is an issue with such a draggy plane.
Sep 02, 2003, 08:31 AM
Registered User
TFLG's Avatar
My F-15 has a RG-14 and it flies alright for a scale jet. It likes to go fast in a straight line. Rolls are good but it in no way wants to loop with that long fuse and short span. The best I've gotten so far is about 1/3 of the way through a loop before is flops off to the side. I have not flown it in hurricane conditions yet but even in good lift it is best left right side up. I expect the same level of performance could be achieved with the Su-35. Any of the popular airfoils will work fine (RG-14, MH-35, 6061,6062, 3016 etc) if you want to go slower then use something like a 3021 or an E205. If you're keeping the planform like the kit wing make sure to have a couple of degrees of washout (i'de go 3 or 4 if I were making it). I don't see any reason it should not fly if it's built and balanced right. Don't have your expectations too high. It's a jet and it is not going to fly like a P-51 or a 60" slope racer, it's gonna fly like a jet. Fly it fast, fly it back and forth, do some rolls etc.

Last edited by TFLG; Sep 02, 2003 at 08:33 PM.
Sep 02, 2003, 05:32 PM
Ado's Avatar
TFLG - Thanks. I`ll give the RG-14 a go.