Just wondering how you guys figure out what prop size will work best? Is it all trial and error? Is there a formula you use? I have a Titan 29 with proboat kv1500 running 2s2p 3000 with x640 I also have a x642 both props run good on 2s looking to run 5s and 6s come spring. As its getting pretty cold here in Mi. Well to cold to go swimming if boat flips hahaha

Thanks!