I'm using a Turnigy 2822 1400kv motor ($13.30 plus shipping) with an APC 7X5 thin electric pusher prop and a 3S Li-poly battery. Works great on a Baby Ringmaster.
https://www.hobbyking.com/hobbycity/...idProduct=4915
You maybe could get by with a smaller motor but this one I know will work.
John