Graupner 13.5 for sure.
If you think what you have is the fastest then you have not tried a Graupner!
The resistance of the coils on a 13.5 Graupner are just shy of most 10.5 motors. Hence the speed.
Oh Graupner 13.5 is the same motor as a Corally 13.5 so either will do.
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