I will move my post from the other thread here



Hi Al,

I will try and help you with the motor question.

Basically, the real differences between outrunner and inrunner are maintenance and to a lesser extent efficiency. The outrunners in general need zero to very little maintenance. The only part that needs replacement as maintenance is bearings, which should last for many flights. Inrunners require gearbox greasing about every 50 or so flights. Inrunners are slightly more efficient (5% or so), but are louder in flight compared to an outrunner.

There are many more options for outrunners than inrunners, which gives you some very low cost options. Be cautious of the weight, the low cost outrunners can be very heavy. Typically the top of the line inrunners and outrunners weigh about 560-600g with all the prop adapters/mounts.

Mostly its a matter of preference, and if you are willing to accept a slightly heavier motor with a little less efficiency to avoid any maintenance work.

Hope that helps!