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Oct 08, 2017, 06:30 PM
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nnP-39 - 100mph Foam Board Plane


If you follow my blog here on RCG or my Youtube channel, you'll know I've become interested in building a fast--100++mph--plane. I started out with the FT Racer. After fooling around with motor/prop combos I realized the plane could be spirited but it wouldn't make the grade. So I started searching for plans and came across Nic Lechner's Mig3 and P-39. Both of those airframes utilized techniques designed for a fast mover. Key among them: Reinforced double layer true airfoil stabilizer and double layer vertical stabilizer. Aluminum reinforced wing with a knife edge trailing edge, and wing/fuselage filets. Nic also produced a video clocking his P39 with a radar gun at 121mph. So I found the platform.

Nic borrows heavily from Flite Test but adds some advanced techniques to his plans such as sculpting the foam to provide knife edge trailing edges. He also uses BBQ skewers to reinforce the nose along the main deck. This little extra supports the use of higher output motors required to hit the speed target. He has a very nice build video for the P-39.

Anyway, here is my build review video of the P-39 and my experience with the 2nd flight. My maiden takeoff was actually much more controlled than the takeoff in the video below as I had someone hand launch for me while I focused on the controls. On the 2nd launch, I gave it an underhand toss with too much AoA and Yaw. Thankfully I managed to get it under control and finish the flight.

I'm using an Emax 2812/06 which is a 3535mm 1550kv motor on 4s with an 8x8 prop. I'm going to try a 9x9 and see what I think of it. I have no honest way of knowing if this plane made 100mph or not; however, whether I actually achieved 100mph is academic for me at this point. The plane is fast, faster than any other model I've flown, so my "need for speed" is satisfied (for the time being).

Thanks to Nic for sharing his plans.

nnP-39 Build Review Goal: 100+MPH (15 min 54 sec)

100MPH Foam Board Airplane nnP-39 Maiden *Holy [email protected]&* (5 min 15 sec)
Last edited by jmxp69; Oct 08, 2017 at 06:35 PM.
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