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I need help identifying electric motor.

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I need help identifying electric motor.

Old 11-24-2023, 07:01 AM
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Default I need help identifying electric motor.

I am looking to find out what electric motor this is so i can know what batteries I need for it. I have never flown electric before and got this with a Sig Rascal 40 so I suppose it will fit a 40 size plane but having never messed with Electric before I need a little guidance. Thanks in advance!

Old 11-24-2023, 10:26 AM
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Without a watt-meter you're in the dark ... until something starts to glow.

Motor mass is a useful indicator for a motor's power rating.
Conservative rule of thumb for max. continuous motor power:
4watt per gram motor mass.
A safe starting point.

And three straightforward methods for measuring motor velocity_konstant_Kv
www.bavaria-direct.co.za/constants (a.k.a. RCG user skylar)

Note that Kv (in rpm/volt, e-motors try to keep a constant rpm) says nothing about the maximum continuous current (in ampère) a motor can handle, nor about maximum continuous power (in watt).
However, Kv has a massive effect on actual current and power drawn, both are proportional to Kv cubed
Silly example: doubling Kv would eight-fold current and power drawn.

(IC engines try to keep a constant torque).

Prettig weekend Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC

Last edited by ron_van_sommeren; 11-25-2023 at 07:38 AM.

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