Mini p-40 23 inch - Page 2 - RC Groups
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Mar 12, 2018, 08:04 PM
Scratch building addict
rotagen's Avatar


She's done ! Came in at 6.8 ounces with 2s 850maH. I'm pretty stoked because my hayabusa at same wingspan is 7.5 ounces.

Normally I wait until first successful maiden to earn decals but it's a rainy day .. so go for it.
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Mar 12, 2018, 09:49 PM
Build, crash...repeat
AleRRon's Avatar
Very cool. It’s nice to save money in this hobby by scratchbuilding, but one gets even more out of it by conceptualizing, designing, problem solving, and learning along the way. Nice work. I’ve been chicken to try “wrapping” rounded fuselages and so far have gone rectangular cross sections for simplicity. I’ll have to try your method soon.
Did you cover everything with foam putty and then sanded, or just covered certain spots?
Mar 13, 2018, 12:54 PM
Scratch building addict
rotagen's Avatar
Initially I debated over trying to make the fuse using my little hot-wire table, by using 2 pieces of styro for the 2 sides and keeping one side flat from the factory for gluing. I did a large p51 fuse this way, with a central thin piece of tougher foam which included the vertical stab - and it actually took a lot of time to rout out the holes and do all the shaping/sanding. So I opted to repeat the method I used on the hayabusa since it flew so well. But it would be a cool thing to try to do it with hot wire and sanding, just coudn't get my head around how to hollow out the fuse etc and keep things straight.

I tried to minimize the foam putty and just covered my vertical and top/bottom "wrapping seams", which matched where I put the cross-section (1/4 pie) formers. Just used my fingers. the stuff sticks well, almost as sticky as lightweight spackle. I also had to put some putty below the nose to smooth it out because I messed up on the shape. Sands down almost as easy as the foam itself. I didn't even bother with this step on my hayabusa but I was trying a little harder since this is my first build thread.

The measuring of course took some time, but I made it easier on myself this time by making two 1mm depron pieces (one for each side of the fuse) , per each longitudinal section of the fuse. and had them meet on top and bottom. I think it took 5 poster board templates (5 shapes) to cover the fuse but that's because I had one between every cross-section.

Definitely try this method, the result is a great flying lightweight nimble plane. Don't hurry like I often do, or you'll get a little frustrated.
I'm always amazed at how stable the little warbirds are. I have a Nicesky p-51 in this same size range and if you throw it gentle, the wings don't drop even a millimeter, just goes perfectly straight.

Turns out I was very lucky on the CG, since I moved the servos way back, a 2S 850mah battery put it right on the mark.

Next time will be much faster since I saved all my templates on poster board. I don't have a scanner at the moment or I could put all the formers on card stock and scan them in - then it's just simply printing out keeping things at letter paper size - I suppose I could drag out my old crappy inkjet with scanner some day if ffolks demanded.
Last edited by rotagen; Mar 13, 2018 at 01:00 PM.

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