HI Matt,
My Aiolos is slightly over 5K dry, & weighs more with a full tank of 600cc fuel. In addition, I'm using the same throttle curve for both the 20.5" & 21" prop & believe the 21" is probably better suited for the cdi version. As stated, the motor will handle the prop, but just needed to throttle up slightly earlier in my case. However, I think I will try it again on my Acuracy which only weighs about 4,800 dry
However, I do like the higher pitch, it pulls just like a freight train. They do make a 21x10PN but I felt like I can use a bit more pitch, hence the reason why I wanted to try the 10.5 pitch. After I've a chance to try the 20.5x10.5 I'll report back.
Adrian
Last edited by riot3d; 10-17-2015 at 09:39 PM.