ADK wrote:
How would one of the composite props, such as an IVO or Warp drive fair in
an application such as I have described? Especially using a 3 or 4 blade
prop.

My cure the problem. May create it.

Also I want to use a segmented drive shaft so that each of two sections are
reduced in length over a single long shaft.

May solve the problem. May create it.

Would not using a 6 cylinder higher reving engine also be an advantage over
a lycoming for torsional vibration or would the concern only change in
frequency?

The concern is about frequency. Not power. Not absorbtion. Not
dampening. Not anything except frequency. If the power pulses
generated by the engine or turbulence around the propeller (the ONLY
excitation sources available in flight), or any of the harmonics of the
two matches the natural frequency of the prop/drivetrain combination,
you'll have a short useful life for the drivetrain.

--
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."