Something else that should be mention is that because of the internal resistance of a feigao 3650 2100kv, Using a 445 would make that motor generate a lot of heat and it is possible that this high level of heat is transfer to the esc threw the wires casing the esc to get excessively hot really fast and as a result damaging the esc.


I think it would be a good idea not to use that motor on 4s with the 445, I personal would buy a bigger motor like a leopard 3674 or 4074 with a y wind. like a 2y or something ending with y, and a good kv would be 1700 to 2000 kv for 4s.