Red B.


Rossi also promised the .65 makes 12,000 RPM on a 12x12 prop... But actually got 10,500...

I would accept calculated HP numbers, for propellers with blade-tip-speeds that are Mach 0.7, or lower, using a tested prop calculator, like the PropPower.


If we can assume torque not to be dependent on RPM... If a very high power, piped .91 can make torque, which is calculated to an output of 2.8 HP, at 14,000 RPM; then if the same torque could be retained to 28,000 RPM, the output would be double that, or 5.6 HP, at that RPM.

If I estimate the 1.05 to make 16% more torque than the .91, due to its increased displacement, its output at 28,000 RPM would theoretically be about 6.5 HP...

But you say it is rated at 6.97 HP @23,000 RPM; 7.3% more horsepower at 18% lower RPM... The BMEP (a direct descendant of which is torque) and thus, VE must be 27.3% higher than that .91...
You could make the exact calculation from below, as well...

Impossible, I would say.