i see what your saying so what prop can i use to get my speed back then? bigger? http://www.nitrorcx.com/99b-10021-650-ep-artr.html the stock is 4122kv and the one i got is 4400kv i messed up getting it thinking it was the same what can i do. i use 2s 5000mah pack would it be ok to run 3s