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680 Motor

Old 11-26-2006, 03:19 PM
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W.A.S.P.S-Flyer
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Default 680 Motor

I have a multiplex 680 motor with a 3:1 gearbox and a 12x8 prop. What prop size would be ideal for this motor in direct drive form?
Old 11-27-2006, 07:45 PM
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Default RE: 680 Motor

Anyone???
Old 11-27-2006, 08:30 PM
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Matt Kirsch
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Default RE: 680 Motor

Sorry, never heard of a "680" motor. Can't find it on the Multiplex website

What are you trying to achieve by removing the gearbox? Direct drive, the motor will be far less efficient and may not spin a useful prop for the plane you're trying to fly with it.
Old 11-28-2006, 06:10 PM
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Default RE: 680 Motor

I heard that direct drive will let the motor spin faster therefor increased speed (Im building a speed airboat). The motor came with my multiplex magister.
Old 12-14-2006, 06:41 PM
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Default RE: 680 Motor

It looks like a 550 size motor to me, I would try and use a 6x5 - 7x5 prop. If it can handle that well, I'd move up a cell. Start at no more than 7 cells.

Good Luck
Ryan

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