On 8 Mar 2005 10:27:24 -0800, wrote:

Yes, it will definitely get tested later on the correct engine. I want
to do an initial run to veryify a few things first though.

What 100hp junk-yard engine could be readily adapted to a prop but not
have nasty torsional issues?

Joa

Think about it Joa, a four stroke cycle flat four produces a power
stroke every 180 degrees of crankshaft rotation. On a V8 the power
stroke occurs every 90 degrees of crankshaft revolution.

Now add to the mix the size of the cylinders. The O-360 is 90 cubic
inches of impulse for each combustion. The 350 cid V8 is 43.75 cubic
inches per cylinder, less than half the per cylinder cid of the big 4.
Bigger cylinders make bigger impulses.

You'll be running direct drive so PSRU reduction ratios aren't a
factor.

Which of the above engines do you think will produce the biggest
tortional impulse to the propeller? 360 cid four, or 350 cid V8?

Corky Scott