RacerX8518

whats the limit on prop size?

I have a predator on its way in the mail and I was thinking about ordering a 2217-09 suppo motor from lightflightrc.com since I'm already planning on getting a different motor for another plane.

If you look at the specs on it ( I think its the same as graysonhobby's motors w/ the same numbering system) its a 950kv etc..etc

11v with a 10x6HD gives around 50mph pitch speed and 32oz thrust w/in amps of my 10c 2100lipo.

so...is 10'' too big or should I just work with a 9''? Any idea of pitch speed/thrust to shoot for?