Martin,
Revised the math after talking with Jim today.
Just do the math, or go to my web site and plug in the numbers.
It was pretty easy, enter the figures and hit the calculate button.
35,114 is going 94.07 MPH
36,000 would be 96.4 MPH
37,000 would be 99.1 MPH
Believe it or not we lose a lot of RPM once the engine is loaded
with the propeller load. I could be off +/- 2% but testing that propeller
on one of my very light 12- Hydros it is calculating out to be 18%.
You have to remember you cannot compare a higher raked propeller to a
much lower raked propeller, the efficiency is much different. I have a friend
making up a test tank and that should reveal the right number. There is a
test tank at the University of Michigan in Ann Arbor, Michigan that could test
the efficiency of these propellers also. Anyone go to U of M that could get us
some lab time?
Awesome engine, pipe, and propeller combination, Nice Work!!!
Mark Sholund