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I also experimented with brush advance. The original setting in the Citicar was zero, and I tried a 10 degree advance at first. It didn't work out well - used more power and was slower to accelerate.
I tried again with a 5 degree advance - Better acceleration, about 2 MPH faster, with about the same efficiency. It is currently at 5 degrees advance - no room to put holes in for 7 1/2 or 2 1/2.
I imagine it'd take some big magnets or interpoles to change the field shape... Do the RC motors run interpoles?
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