SU-25/39 Frogfoot - RC Groups
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Oct 01, 2012, 10:39 PM
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SU-25/39 Frogfoot

Figured i would give it a go.

I'm going with a clarkym-18 @root 0 incidence and clarkym-15 @tip 2 degrees washout

Gonna try to get some landing gear on this one.Would be nice to get at or near 1-1
being they were known for taking off with more loadout weight then the aircraft weighed itself.
Last edited by D_FAST; Oct 08, 2012 at 10:13 AM.
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Oct 02, 2012, 02:54 AM
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more model'd

next up... ducting
Oct 02, 2012, 09:39 PM
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SU-39 Variant

being pretty much one of the same.Im modeling in the 39 or 25Tprts as well.
Oct 02, 2012, 11:38 PM
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All data used was from the fsa calulator
Oct 08, 2012, 09:26 AM
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Well my brother got a hold of a dynam a-10 2x64.

So 2x 64 it is. Im still going to work on the single plan as well.

I tried my best to keep everything scale. The A10 its supposed to be bigger then the frogfoot,in length and wing span.

But there was no way i could squeeze 2x64mm into something scale in size to dynam's a-10.

Im not sure how they did it. I had to tweak both the intake and exhaust areas, as well as fatten the whole engine naccles upjust to make this work on 43in wing span.

Im using EPS with this build, its so much lighter then the home depots pink foam.

Im cut all sections at 1" but im using mixture of 1" ad 2" section cuts, example canopy/wing root/front engine nacelles well be 1" to capture the nice curves, the rest is 2"cuts

to make this work i need other empty airframe weight of around 14oz.

Im thinking of a built up wing on this one, and i want to do the full moving stab, but then there is the angle it sits on.
I've never built a wing in such manner so have no way to know how to cad it.

been plowing threw the forums searching for built up+ wing + construction,my head is spinning.

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