302Sport

http://go-fast.com/prop_slip.htm

this is easier haha http://go-fast.com/Prop_Slip_Calculator.htm

tomcat

Hey Brownie, thanks for reminding us that there is nothing new under the sun. All of these equations also need to be adjusted according for local conditions, like whether or not you are in a bar. And don't forget Smoky Yunick's theorem (I think it was him)

OA + T > Y + E

302Sport

i think whats crazy, even with all the new bottom tech, the major factor in speed is still weight. Also the fact that a non-step hull starts running out of bottom at certain speeds, but I would like to see a 42 cigarette straight bottom vs a 42 twin step with optimal props and drive heights using todays tech. Both boats with 700's......This would give an accurate idea of how much better the bottom is. I remember speaking to somebody that worked at Cig back when the first stepped boats started coming out and he told me that the step really only gained a couple if any mph, and it wasnt until they started raising the drives and lightening up the boats that the speeds came up.

A.O. Razor

And this even more so

http://www.heringpropellers.com/prop-slip