# How can I use electric motor data with my prop data to obtain a power available versus velocity curve?

I'm not entirely sure this is appropriate for this forum but it's worth a shot...

I have propeller data ($C_T$ , $C_P$ , J , and $\eta$) and very very limited electric brushless motor data (motor diameter, shaft diameter, Kv, voltage range, max amperage) I am trying to put together a power available curve (P vs V) but I'm not exactly sure how to use the data I have to do so. How do I get shaft power from my engine data? Or what can I use?

• So your question is about the shaft power vs the voltage? I mean the propeller data have nothing to do here, correct? If so, here is some information, but I'm not sure this is complete.
– mins
May 27 '16 at 0:23
• No. Power available to the aircraft verses velocity. May 27 '16 at 20:23
• For electric motors, torque is a function of amperage and rotational speed is a function of voltage. Jun 10 '17 at 20:15