Related by context. Frequent words. (Click for all words.) 51 rotor blades 50 rotating blades 49 laminar flow 49 propellers 48 tail rotor 48 propeller blades 48 pressurisation 47 propeller 47 spinning blades 47 tilt rotor 47 propellor 47 radome 47 rotor 46 helicopter rotors 45 airstream 45 twin rotor 45 VTOL 44 currents 43 rotors 43 microbursts 42 helo 42 turbine 42 winching 42 CH #E 42 unpowered 42 turbofan engines 41 luff 41 rotor blade 41 downdrafts 41 drogue 41 STOVL 40 airfoil 40 tidal currents 40 CH #K 40 crosswind 40 ailerons 40 deflector 40 rotor diameter 40 depressurize 40 cavitation 40 venturi 40 Kiowa Warrior 40 combustor 40 flapping wings 40 vertical takeoff 40 chopper 39 Hueys 39 Super Stallion 39 Globemaster 39 towline 39 Osprey tilt rotor 39 turbofan 39 torsional 39 downdraft 39 amidships 39 turbines 39 tidal turbines 38 ocean swells 38 Harrier jets 38 forestay 38 helicopters 38 sonars 38 Harrier jet 38 Coastguard helicopter 38 airframe 38 winch 38 cyclonic 38 helicopter 38 aircrews 38 turbine blade 38 airdrops 38 impellers 38 turbine blades 38 aircraft 38 Cormorant helicopter 38 autopilots 38 centrifugal forces 38 Twin Otter 38 throttles 38 Dornier aircraft 38 slewed 38 B 1B Lancer 38 Sea Harrier 38 rapid decompression 38 Chinooks 38 vanes 38 velocities 37 twin engined 37 cowling 37 minima 37 hydrodynamic 37 overflying 37 altimeters 37 torquing 37 afterburner 37 sailplane 37 updraft 37 airflow 37 tidal 37 conning tower 37 UAV