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[16-21]

Hi all,

I was having a tidy out and found two graupner 900 Torque motors
Still boxed and not used.

I know the rpm at 12v is 6500
However would anyone now how the rpm will increase per volt added?
Say 18V =
And of course 24V

Many thanks

[HMS Invisible]

Don't use the Graupner 900 above 12volt.
Look at the stall current.

[16-21]

54amps stall current.
Range 6V - 40V
Nominal 12V
It's quite good idle current wise though.


Mike, when will you be releasing a new 40amp Esc??

[HMS Invisible]

   At 12volt there was already enough energy in this motor to pop a bait boat supplier's well known brand escs. It was ok with my esc though.    I suggest you connect wires to one of the 900 motors and to 12v and 24v battery. Where you make the connection it will have a tendency to weld together and erode contacts.

The idle current is only another numerical indicator of an efficiency peaking at less than 20% of stall current, as is the peak of 71%. A higher or lower idle figure loses significance if you load the motor down below 70% of no load rpm. If you don't use its high torque capability you may as well sell the pair to get four 800 equivalents.

[16-21]

I've sent you a pm Mike

[HMS Invisible]

I've sent you a pm Mike

I say share your results and put the questions on the forum.