Take in the flight performance of the OMPHOBBY M7, equipped as a 3.8kg ultralight helicopter! Through careful choice of components, achieving a flying weight below 4kg is very possible and viable. Setup:

M7 Airframe: 2225g
SUNNYSKY 4520550Kv: 400g
Tribunus 12130A: 150g
4x KST X201806: 55g per servo
VStabi NEO: 14g
2 Blades RT6903: 149g per blade
RT116: 6g per blade
6S 3300mAh 45C: 518g

Flying weight: 3837g