There are systems for Baby clown and 1/2a ringmaster in the "List your set up" electric section. Here's one I found:
Wingspan 25 1/4", area 136 sq-in
Weight 10.5 oz
Motor: BP Hobbies 2212-13 Outruner, Kv=1000
ESC: BP Hobbies 20 amp helicopter, in governor mode
Timer: timer replaced by RC throttle control
Battery: Hyperion 3rd generation 3S 850 mah LiPo
Prop: APC 8x8 thin Electric
Line length 40' eye to eye
Lap time 3.7 sec at 7,500 rpm
Static power at 7,500 rpm approximately 150 watts
Flight time: 4 min to keep battery usage to 80%.
Setup will also do 4.3 sec laps on 50' line for 3 min.