RPM of K'nex engines?

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.

Picture of RPM of K'nex engines?
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The standard red and clear motor is 32 RPM and the electric motor is about 30 RPM. Hope this helps.
murraylp28 years ago
i think the battery one is faster but struggles with heave loads.
So are you going to give best answer??
Yeah sorry I was on vacation so I had no time, am I forgiven?
Are you sure though because I would have expected the electric one to be faster.