A little about the F4 Cub. Electric power with ~800-1500mAh 2s lipo. Brushed motor with a gearbox with various gear ratios Wingspan ~40'', under cambered wing "slow flyer" 3 channels. No ailerons as it is designed to be a simple easy to fly plane that I operate with landing gear on pavement.
Steering via tailwheel allows taxi on pavement and bare ground. I usually sit in a folding chair while flying it and Taxi it to the ROG area and after the flight of up to 30 minutes or longer depending on the lipo used, I taxi it back to where I am seated. People say to me that it "Flies like a bird"
ROG's are its specialty with scale like take off and landings that when people see it do those things they are amazed at how realistic it does them. They often clap and say wow, that was a sweet landing! I put on a air show yesterday with 3 GWS plans for three ladies in the neighborhood who brought their elderly wheelchair bound mother to watch the show
I have been flying these GWS cuds since 2007. IMO, these "cubs" are the best R\C planes available, (I have 5 of them). I decided to upgrade to a brushless inrunner on the one in this thread
First motor tested was a GWS Ducted Fan motor that I installed in a GWS gearbox with "C" ratio gear with 10.47 prop.
Worked very well on the test flight but Telemetry reading of current draw from the small lipo used was too high (6 amps @ medium throttle) from a 2s 1300 pack. Overpowered and short flight time but other than that worked well.
Next I will try a Bm2410-08 BL outrunner which should be be in the 2-3 amp medium throttle range.
I do happen to know about flying, as I studied the physics of it as a teenager while in the Civil Air Patrol. Sigh...to be young again. 
maybe not...
