helicopters

n.

直升机( helicopter的名词复数 )；

Principles of helicopter aerodynamics
Quadrotor Helicopter Flight Dynamics and Control: Theory and Experiment
An interactive approach for hierarchical analysis of helicopter logistics in disaster relief operations
Principles of Helicopter Aerodynamics
Control of a quadrotor helicopter using visual feedback
Output tracking control design of a helicopter model based on approximate linearization
An Application of Reinforcement Learning to Aerobatic Helicopter Flight
Adaptive trajectory based control for autonomous helicopters
Autonomous Inverted Helicopter Flight via Reinforcement Learning
Output Tracking Control Design of a Helicopter Model