Algin T-Rex 700 with Costum Built Motor Mount for Brushless motor Scorpion HK 40/35 44 Volts! This design is with the clutch! The clutch is very EZ on Your electronics on start up and If You Love scale like we do, The start up on a scale Helicopter with the Winding of the brushless motor first Then  the clutch starts to engage and the blades slowly start to turn.WOW! This is top notch.