Thank you for your replies, Melanie it was more of a 2 wheel design but now it might incorporate a Biddy Bingo Button for the 4 wheeled variety. I had the equation in mind that a motor constant is proportional to the ratio of peak torque to peak power at stall etc, for a loose association, but summised the law as always would be even looser than this. At least now I can cover my bottom, many thanks to all for your input
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