rudders, rotors, propellor, blades, motors, sponsons, tail rotor, airfoils, halyards, vanes, skeg, impellers, windlass, hulls, centerboard, underwing, outboard motor, davits, piston, towline, aerofoil, nosewheel, hydrofoils, fin keel, strakes, ailerons, gliders, bilge pump, hawsers, propulsion, cowling, pontoons, winch, rotor blade, turbine, foremast, landing gear, centreboard, hydraulics, triplane, daggerboard, backstays, engines, inlet manifold, downwash, propeller shaft, paddlewheel, hydraulic ram, fins, sponson, radome, outboard, deckhouse, hydraulic pump, tailplane, capstan, undercarriage, boats, foredeck, outriggers, furling, forestay, scow, chocks, sprockets, periscopes, tail fin, cogwheels, foresail, fiberglass, spindle, tailstock, groundspeed, vertical fin, spool, fenders, bulkheads, airframe, headstay, airbrake, sterns, mainmast, arrester, pulleys, empennage, helldiver, bimini, engineless, vortices, aircraft, paddles, conning tower, wingtip, sheave, magnetos, gimbals, rotor shaft, portholes, mainsheet, ornithopter, bearings, nozzle, propeller, turbines, compressors, lathes, wheels, winches, elevators, locomotives, plows, boilers, presses, reels, turntable, dredges, engine, machines

aeroplane, airplane, double-prop, double-propeller plane, plane, synchroniser, synchronizer, synchronoscope, synchroscope, twin-prop, twin-propeller-plane