ORIGINAL: dmcconneyherc
......One consideration I found was that a 15x12 four blade prop needs to spin at a much slower speed than an electric motor (typically 5500 rpm max compared to 11,000 rpm). I think this would present a massive problem for the match of motor and prop and I have no idea what would happen if I tried this combination.
Dave
Your right again on all points except RPM.
An E-flite motor uses the spec "Kv" which denotes RPM per volt (not "kilovolts" like you are used to thinking) . Most large motors are in the 130-150-180 Kv range. You can find them up to around 230-250.
So if you want to turn your prop at 5500 rpm with 36 volts then your motor needs to be in the 150Kv range.
Check the specs on this motor... [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=5139&Product_Name=HXT_80-100-A_180Kv_Brushless_Outrunner_(eq:_70-55)]Big Outrunner[/link]...just for an example...it has a 180 Kv rating. It was also 85 bucks a month ago....dunno whats up with that[X(]