BrotherHobby has released two new motors the BrotherHobby Tornado T7/T10. These motors are designed for large prop operation. BrotherHobby T7 4215 drone motor features Titanium Alloy hollow shaft,will make long and short two versions shaft,to help for more props. BrotherHobby T10: 5215-170KV for 22'' prop on 12S, 5215-340KV for 20'' prop on 6S We will have these babies in stock within two weeks. BrotherHobby T7 4215 BrotherHobby T10 5212 .