Graupner 720 BB Torque mount - RC Groups
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Aug 23, 2012, 10:44 AM
Registered User

Graupner 720 BB Torque mount

I'm the process of designing a watertight vessel for a Graupner 720 BB Torque motor, to be used as a thruster on a submersible craft. I have searched the web high and low, and called dealers, but I can't seem to find any drawings or dimensional information on the mounting holes for this motor. I don't have the motor on hand, because I want a completed design (i.e., CAD) before ordering any parts.

It seems odd to me that a motor company would not provide dimensional drawings so that people can actually USE their products. Does anyone know the mounting info for the Graupner 720 BB Torque motor?

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Aug 23, 2012, 12:26 PM
Boaters are nice people.
Hi Matt,

The mounting holes on a 700 motor are 29 mm apart and are M4 threaded
The ballbearing stub on the front is 18,3 mm and protrudes 6 mm.

Can 45 mm including the fluxring, can length 72 mm (without the shaft)

Whatever you're designing, make sure the motormount doesn't block the cooling slots, the airflow through the armature is vital (as is a cooling jacket and brushtab cooling if the motor has to work hard).

Hope this helps, regards, Jan.
Aug 23, 2012, 02:34 PM
Registered User
That is exactly the info I needed, you are a lifesaver! Thanks again.


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