Related by context. Frequent words. (Click for all words.) 60 turbofan engine 54 VTOL 54 combustors 54 Skycar 54 AuraGen 54 lightweight composites 54 exhaust aftertreatment 53 M#X [001] 53 CH #K 53 turbofans 53 PW#G engine 52 Mobion 52 HYbrid4 52 turbojet 52 SkySails 52 BMW ActiveE 52 hydrogen internal combustion 52 P 8A Poseidon 52 BF# [003] 52 GEnx engine 52 UCAV 52 Mk3 52 turbofan 52 cell DMFC 52 EA# [001] 51 ornithopter 51 CH #F 51 ramjet 51 piston engine 51 DPFs 51 electrolyser 51 electric powertrain 51 EH# [001] 51 scramjet engine 51 Geared Turbofan engine 50 gyroplane 50 #XP [002] 50 Megacity Vehicle 50 CFM# engines 50 diesel powertrains 50 WheelTug 50 Voltec 50 centrifugal compressors 50 JT8D 50 BK# [003] 50 PiperJet 50 Fischer Tropsch process 50 GEnx engines 50 rotary engine 50 aerodynamically efficient 50 conventional internal combustion 50 reciprocating engines 50 electric propulsion 49 BMW Vision EfficientDynamics 49 Aerovironment 49 scramjets 49 electric drivetrain 49 hybrid propulsion 49 brushless motor 49 #kw [002] 49 turbine engines 49 variable valve 49 spark ignition 49 electrically powered 49 CH #K helicopter 49 twinjet 49 AESA radar 49 Turbocharging 49 SmartDeck 49 Protonex 49 tilt rotor 49 Mobion ® 48 hybrid drivetrain 48 Ercoupe 48 Dual Fuel 48 Engine Alliance GP# 48 UCAVs 48 Terrafugia Transition 48 twin turbo engine 48 roadgoing 48 Technology Demonstrator 48 Direct Methanol Fuel Cell 48 Continental Supersports 48 UH #M 48 engine 48 tiltrotor 48 dynamometers 48 vertical takeoff 48 H2GO TM 48 liter turbodiesel engine 48 CF6 48 PEM fuel 48 airfoils 48 & Whitney PurePower 48 BMW ActiveHybrid X6 48 aftertreatment 48 prototype 47 #.#L diesel 47 GE Jenbacher 47 compression ignition 47 windtunnel