If you have a 250 size CCPM heli this is the motor for you. This motor is perfect for your 3d or sport or hover mode

Specification:
◆ KV value: 3900kv
◆ Shaft diameter: Φ2.5mm * 35mm
◆ Weight: about 38g
◆ Input voltage: 2-3cell Li-Po
◆ Max continuous current: 20A (30sec)
◆ Maximum output power: 220W (30sec)
◆ Housing diameter: 26mm
◆ shell length: 24.5mm

Required but not included
◆ Suitable level: 200 250 class electric helicopters
◆ gear:15-16T