I have serveral dynathrusts 22-10's I will give you. I used ONE dynathrust on a G-38 for YEARS, flew the helll out of it, hit it on the rocks, hit it on the pavement, took a BIG nick out of the leading edge, filed it down the nick and flew it a bunch more [X(] BUT I have heard enough people say they break in flight that I am afraid to use them now, especially on my G-62's.. Im smart enough to know that just because mine didnt break does not mean that there is no problem.... If you do use dynathrust, they will arrive to you so out of blanace that you better get your hacksaw out [:@] I had to trim at least 1/2 inch off mine to balance them correctly... They are very inefficient, but I was trying to save some money, but I just ended up throwing my money away... Send me a stamp for postage and I will send you 3 22 inch dynathrust props to stir paint with, ruin your airplane with, or impale your best buddy with on runup .