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RPM of K'nex engines? Answered

Does anyone know the revolutions per minute for the K'nex electric motor (grey one with mains adapter) and the revolutions per minute for the K'nex tethered battery motor (same as standard battery motor I think). Electric one is first picture, battery one is second picture.

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The standard red and clear motor is 32 RPM and the electric motor is about 30 RPM. Hope this helps.

i think the battery one is faster but struggles with heave loads.