As mentioned, Bedworth run 27T BR and 17.5 BL as the "Stock" class. So far, the lap record in this class is still held by a 27T BR motor.
This class works well; a newbie can run a cheap 27T BR setup for very little money. The experienced guys can run BL without all the maintenance headache. Both end up with about the same performance. A few people have tried timing advance ESCs, but the effect seems to be less with these motors than with faster ones.
13.5 BL is massively faster than 27T BR, and any club running these together is being unfair on newbies and those on a budget.
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