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Richard Casady wrote:

On Fri, 17 Aug 2007 18:26:31 +0700, wrote:

Here's a little engineering insight. If a drive shaft is lightened
by drilling out an axial hole whose diameter is one half the outer
diameter - the shaft's strength in torque is reduced by 5% and its
weight is reduced by 25% This is important in aircraft
construction.

Driveshafts are usually tubes and not rods. Always for cars and big
ships. It is only the smaller boats that lack the space.

Casady

uh what have you been taking?
drive shafts on cars are tubes may be on other things; i have only seen one
driveshaft on a boat that was tube and it corroded til it fell apart.
mostly you find a ss shaft machined to speck for the boat and the power out
put of the engine.

but go ahead and use spring steel tube drive shafts it will give me
business.