Thread: Discussion Prop advice
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Old Sep 30, 2012, 04:14 PM
MCarlton is offline
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Cromer,Norfolk, UK
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In general, a prop has two loads which it imposes, coming from a combination of pitch and diameter. If either increases, so does the load on the engine, and thus the RPM reduces.

So, generally, whilst you are correct in that increasing pitch will increase the maximum speed (assuming the airframe drag etc enables it to increase) but only if RPM is minimally altered. So, generally, a rule of thumb is that 1inch more pitch = 1in LESS diameter.

So in your scenario, to get a higher speed, you would either need a 4x6 prop, which I doubt you'll get, or a much higher Kv motor, which will turn a smaller prop at a faster speed.
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