helloman1976
Ziptie Relocation Expert
My question is how do you know your going to need 10" rather than 8"?
Beep, Beep, Honk, Honk, Over and Out Rotorhead
Trial and error or experience from someone who's already done it. There are too many factors to be able to say one will work where the other one won't. Weight is a huge factor and will help determine prop size and if your model is heavy, bigger props will be required versus the opposite. 10" on a stock F550 is probably fine with 3S but I hear with 4S you should use 9" but I have no experience with that personally. I fly an F550 with 750Kv motors and 10"x5 APC props that I balance to as close to perfect as I can. Hope that helps...