- Recommended pitch is theroetical as it assumes no
- For very high pitch props (70"-80") the calculated
Tip Speed has been adjusted 5%-6% to approximate true helix Tip Speed. Otherwise
circular Tip Speed is shown.
- Ideal Tip Speed varies depending on the H.P. per square ft
of the prop disc.
- The efficiency of a propeller is reduced as the tip speed
approaches the speed of sound. Beyond 80% of the speed of sound, further increases
in RPM has little affect on thrust. Thus, it is important to keep tip speeds below
75%-80% of Mach.