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hello! I have a Dynam Skytrainer, and i have it for more than 3 years now, as i was trying to fly it yesterday i had problems with its power(not enough thrust), its the first time this happened, I'm not sure if its the ESC or the Motor, i'm thinking about upgrading both and i need some suggestions, all the motors i've seen have short shafts and has no thread, not sure if it would work. please help, thank you