If you must use a 7" prop, you'll have to run that motor on 4s or 5s to get enough power. With 7x5 on 4s you'll have 225W/25oz thrust... might be enough. On 5s you'll have 400W/38oz thrust (too much for the motor?)
Last edited by Dr Kiwi; 10-17-2013 at 08:31 PM.