Here's a mathematical formula I derived to calculate speed (mph) for a cat only.
Basically, it gives you an average figure for speed, based on a collection of 30 actual catamaran setups I've come across online. It takes into account the prop, kv, volts, rpm. This formula works for LiPo power only. Engineers relax, I am only a dentist. Differences in prop slippage, friction losses, cat hull design, weight, electrical/mechanical issues are all moot since this is not a theoretical equation. This is a statistical equation based on samples under their actual running conditions.
mph = [Prop Factor] x [Prop dia] x [kv motor] x [LiPo Volts] x 0.000687
or
mph = [Prop Pitch] x [Prop dia] x [Prop RPM] x 0.000687
or
mph = [Prop Distance per Revolution] x [kv motor] x [LiPo Volts] x 0.000687
Remember it's only a statistical approximation for speed. As they say, individual results may vary. Good Luck!
Basically, it gives you an average figure for speed, based on a collection of 30 actual catamaran setups I've come across online. It takes into account the prop, kv, volts, rpm. This formula works for LiPo power only. Engineers relax, I am only a dentist. Differences in prop slippage, friction losses, cat hull design, weight, electrical/mechanical issues are all moot since this is not a theoretical equation. This is a statistical equation based on samples under their actual running conditions.
mph = [Prop Factor] x [Prop dia] x [kv motor] x [LiPo Volts] x 0.000687
or
mph = [Prop Pitch] x [Prop dia] x [Prop RPM] x 0.000687
or
mph = [Prop Distance per Revolution] x [kv motor] x [LiPo Volts] x 0.000687
Remember it's only a statistical approximation for speed. As they say, individual results may vary. Good Luck!
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