If you are racer, that motor is useless, i guess its the reason why the price is liltle bit low, 780kv will suit 10s power or even 12s, but 1521 is too small for 10s boat or T racing class boat, you can use it on smaller boat running 10s lipo just for sport run, but in that case you will end up spent much more money on lipo as well, so.... my opinion is just forget about it
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