Mark Wrathall wrote

I'd look at getting the biggest turbo you can possibly find, to
try and keep the rpm down. At 100K you will have a great deal
of trouble with that long extension shaft bending. The slower
the turbo the more likely you will get this design to work.

Paul Lamar responded:

We can shorten the 1/2 inch shaft Mark. Good point. Or make it
from carbon fiber. That lowers the mass and reduces the off
center whirl effect.

We can also attach the gear box to the compressor for better
alignment.

In addition to making the shaft as short as practical, you could also make
it hollow to keep the mass down.  Just like the prop shaft, outside diameter
of the shaft is the major component in its strength.

Russell Kent

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