Would require an electric rc motor equivalent to an AXI 2826/12 External Rotor Brushless. This motor would allow this model to perform basic aerobatics with its semi-symmetrical wing. Specs of the Hangar 9 Arrow You will need these numbers to help determine the motor, battery, and prop requirements. Wingspan: 63 in Overall Length: 52.5 in. Team Corally Dynotorq 815 1/8 Sensored 4-Pole Competition Brushless Motor Turns 2.5D 1750 KV Product code: C-61202 Team Corally 815-4 Pole 1/8 class brushless motor series is a high performance motor line developed using the latest technologies.

If it is a high number (high tens to hundreds) it is the motor's "Kv" constant, or voltage constant in RPMs / V 4. An optional Y or D means the windings are terminated Y or Delta - for the same TURN COUNT, Y-terminated motors rotate slower and with more torque for the same current draw, but need a higher voltage to achieve said current draw. For brushless motors, you would measure the RMS voltage between any two leads. The formula to calculate Kv for brushless motors is: This is just speed divided by voltage but the 1.414 term is to convert RMS voltage to peak voltage. The 0.95 term is "fudge factor" that has been found by hobbyists to give you the right answer.