MAS doesn't make the prop size I use on my P-51 and they do flex quite a bit. I don't fly off of grass so thats not an issue.

I found a great article here [link=http://www.fly-imaa.org/imaa/hfarticles/safety/v5-1-24.html]http://www.fly-imaa.org/imaa/hfarticles/safety/v5-1-24.html[/link]