want to put an 11in, 4 blade prop from hobby lobbly on my pkz p-47. what will i have to change in order to make everything work? lower kv motor AND speed control or just motor? the plane comes with a 15 size motor (about 960 kv i believe) and a 30 amp speed control. the 4 blader would look so much better the the stock 2 blade prop. lemme know what ya guys think. thanks!