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Motor Selection

A project log for Electric Propeller Backpack for Skiing

Mini paramotor designed to push a person on skis.

peter-buckleyPeter Buckley 03/31/2021 at 21:190 Comments

The motor is the key to this project. If the motor cannot produce enough thrust, the project will not work. If the motor is inefficient, the battery will die too fast. Along with these constraints, I do not have a ton of money to spend. Due to budgetary concerns, I headed to my favorite Chinese wholesale website Alibaba. After looking at many thrust charts, I eventually decided on a motor, the eagle power Ea98 90kv. Spinning a 35 inch propeller, this motor can produce 19kg of thrust at 65amps. This metric is almost to good to be true, especially for an $88 motor. The T-Motor P80III is similar in both size and spec, but costs more than twice as much. Along with the moto I purchased a 35 x 10 carbon propeller and a Hobbywing  x-rotor 80a esc. All together it cost me $270 shipped. For battery's, I plan to use 6 5000mah 6s lipos I purchased for an electric bike a few years back. 

Here is a picture of the electronics.

In my next update I will cover the mechanical design and materials choice.

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