On Thu, 18 Oct 2007 21:49:59 -0700, druid wrote:

One problem with most of the prop-calc programs I used is they don't take
into consideration the HORSEPOWER of the engine. Same prop for an 8hp as a
20hp? I don't think so!

That is correct. More horsepower generally means more torque, and
more torque gives you the ability spin a prop with more pitch, all
other things being equal.