Stuka Stunt Main Forum · 3 of 3 known posts recovered
How bad a stunt engine is a stock OS 35 FP-S, roughly '83 or '84? If I run it with muffler pressure, Uniflow, and small venturi, should I add a head gasket? It will be hauling a Ringmaster or Streak. Prop size? What else? I don't want to have it reworked, which might be the smartest thing to do.
Then again, I am tempted to make it a Hot Rod, large venturi, backplate pressure, 9 - 8 prop cut down to 8 - 8, and forget 4 - 2 - 4 runs. Just scream for fun on 60 foot lines.
Ideas?
Larry F
The first FP's I had, probably 1981 or so, were lapped piston type, with iron pistons and steel cylinders. Yours is probably the ABN that they changed to about 1983. My 40 was the hot rod; the 35 was more amenable to sport and stunt-type flying.
>If I run it with muffler pressure, Uniflow, and small venturi,
>should I add a head gasket? It will be hauling a Ringmaster or
>Streak. Prop size? What else? I don't want to have it reworked,
>which might be the smartest thing to do.
>
I didn't run the first pair of FP's with any mufflers that I can recall. The 35 liked an 11-4 Zinger well enough, running in a two cycle, but remained a bit "quick" on 60' lines with the 550 square inch foamie mule I made from a Slow Combat plane. I had much worse luck with the FP 40. But neither one came anywhere close to running an old style stunt 4-2-4 no matter the venturi size or number of head gaskets.
>Then again, I am tempted to make it a Hot Rod, large venturi,
>backplate pressure, 9 - 8 prop cut down to 8 - 8, and forget
>4 - 2 - 4 runs. Just scream for fun on 60 foot lines. Ideas?
>
For that, I'd get a 6 ounce size sullivan RC tank to use as a bladder compartment, and forgo the crankcase pressure. It's too much easier running a bladder compared to a hard tank that I doubt I'll ever bother trying it again! And for fast flying, a Streak is greatly preferable over any Ringmaster.
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Kiwi