Originally Posted by ripplewave
Even the 11" prop is not overpropping. In fact it is giving me just about my target power of 150 watts. The 9" props don't get over 100 watts.
For me - I go for THRUST ... watts are fine IF you are getting pitch speed / thrust as well.
Put a flat plate wood on a motor and have it put out a million watts - you aint going anywhere with it !
Only value I see in figures above is the run-time with the 9" will be better than the 11"...
But on a QB10 - originally designed in LitePly and balsa flew on an IC 10 engine.... that's small and could never swing a 9" prop well and certainly not an 11". Even when I converted my QB10 to a 'ballistic display' machine without wheels, swept back wings and an IC 20 motor - she still ran only a 8x6 .. and then it was very torquey !
A large diameter prop will have a serious flywheel effect and create a torque moment ... My foam QB10H now as i say is on a 7x5 ... and that climbs like a bat outta hell !
Only trying to help ....