0 a type of aircraft without wings, that has one or two sets of large blades that go round very fast on top. It can land and take off vertically and can stay in one place in the air:
1 a type of aircraft without wings but with large blades that spin on top
2 a type of aircraft without wings, that has long flat parts on top that go round very fast. Helicopters take off and land vertically.
The helicopter made a drop of much-needed supplies to the stranded hikers.
The crew of the ship were winched to safety by a rescue helicopter.
Note that the helicopters are not physically coupled in any way.
The average salary per soldier is about $3,500 per month, with top helicopter pilots and country commanders earning about $7,500.
The overall motion plan for a single virtual lead helicopter is assumed.
