If your Lipo pack is 25C ~ 30C, powering a stock 540 (or anything up to 23T) shouldn’t be a problem. For brushless, a 17.5T without aggressive gearing would still be ok.
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If your Lipo pack is 25C ~ 30C, powering a stock 540 (or anything up to 23T) shouldn’t be a problem. For brushless, a 17.5T without aggressive gearing would still be ok.