I'm sure he is a couple of steps beyond the basics I have outlined.ĭata point: Cessna 182, 230 HP 2600 RPM 82' prop 948 FPS ~.86 Mach tip speed. I felt a kinship and above all an admiration for his background, knowledge and ability. So, one can rock these factors back and forth on a computer and find the sweet spot for efficiency and maybe feed in other practical requirements as well.Īs I was reading Craig Catto's autobio a couple of years ago. Engaging, informative, and easy to follow, our Propspeed application video will leave you with confidence when applying the Propspeed system Propspeeds Vic. The bigger the diameter, the greater the mass, the less slippage and the higher the efficiency. However, thrust is produced by grabbing air and pushing it rearward. Moving up or down two inches in pitch will usually change WOT engine speed by approximately 400 RPM. Greater diameter produces a higher mach number. That means diameter + a little adder for forward speed, times a constant = mach.
We are generally stuck with a given propeller shaft speed, say 2700 RPM. While underwater lights provide increasingly longer service life, Lightspeed also promises worry-free 12-24 months with reduced maintenance. The two main competing factors which dictate a certain tip speed for maximum efficiency are: tip compressibility drag rise, and mass flow through the propeller disk.
