phil wrote:

    Would seamless pipe (4130) be a proper "tube type" material to use
for a shaft turning max 2000 RPM @ 200hp, 300 hp max?  The ends need to
be splined to slip onto a gear.

   If seemless pipe won't work, what might do the trick? It must be
hollow because I need to run a tube through it.

Dimensions are everything. Do you have a sketch?
What RPM is the engine generating 300 HP? Also what type of engine?
Four cylinder piston engines at 200 HP have much worse torque
pulses than 2 rotors or a six cylinder piston engine.
What is on the end of the shaft?

Paul Lamar
 
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