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...me of the kinetic energy, and the propulsive mechanism (whether propeller, jet exhaust, or ducted fan) is never perfectly efficient. It is greatly depende Most aerospace vehicles are propelled by heat engines of some kind, usually an internal combustion engine. The efficiency of a he ...

...st with a "black box" description which only looks at what goes into the [[jet engine]], air and fuel, and what comes out, exhaust gas and an unbalanced f ...2</ref> "Flight" gives examples of these internal forces for two early jet engines, the [[Rolls-Royce Avon]] Ra.14<ref>{{cite web|url=https://www.flightglobal ...

Specific fuel consumption of air-breathing jet engines at their maximum efficiency is more or less proportional to exhaust speed. ...ology tend to be quite small. Increasing [[overall pressure ratio]] on jet engines tends to decrease SFC. ...

...e paddle will provide astern propulsion. Redirecting the thrust of a water jet driven craft, changing the cyclic pitch of a [[Voith-Schneider]] propulsor, ...hips such as the [[R-100]] could reverse the direction of rotation of some engines, so reversing the direction of thrust of the attached propeller. This faci ...

...]] aircraft performing a vertical climb using its [[Pratt & Whitney F135]] jet engine, which produces {{cvt|43,000|lbf|N}} of thrust.]] ...itch propeller blades, or using a [[Thrust reversal|thrust reverser]] on a jet engine. [[Rotary wing aircraft]] use rotors and [[thrust vectoring]] [[V/ST ...

...on}}{{For|the effects of a stall of the airfoil within the compressor of a jet engine|Compressor stall}} ...ol unit|ECU]] [[ignition system]]s have greatly reduced stalling in modern engines.<ref>{{Citation |last = Hatch |first = Steve V. |date = 2012 |title = Compu ...

...t]] using propellant or a [[jet engine]] using fuel, generates thrust. For engines like [[cold gas thruster]]s whose reaction mass is only the fuel they carry ...ccounted for. Actual and effective exhaust velocity are the same in rocket engines operating in a vacuum. ...

The force created by [[propeller (aircraft)|propellers]] and [[jet engine]]s is called ''[[thrust]]'', and is also an aerodynamic force (since ...

{{Short description|Dimensionless ratio of thrust to weight of a jet or propeller engine}} ...ntity|dimensionless]] ratio of [[thrust]] to [[weight]] of a [[rocket]], [[jet engine]], [[Propeller (aircraft)|propeller]] engine, or a vehicle propelled ...

...roviding [[deceleration]]. Thrust reverser systems are featured on many [[jet aircraft]] to help slow down just after touch-down, reducing wear on the br ...essjet/how-to-handle-an-engine-failure-on-takeoff-v1-in-a-jet/|title = How Jet Crews Make Their Go/No-Go Decision During Takeoff}}</ref> this need is more ...

...JPG|thumb|250px|A Honeywell GTCP36 APU mounted in the tail of a [[business jet]]]] ...t of both World War II-era German [[BMW 003]] and [[Junkers Jumo 004]] jet engines (pullcord starter variant shown).]] ...

|designer = [[Reaction Engines Limited]] ...//www.reactionengines.co.uk/downloads/REL_Engine_Names.pdf |title=Reaction Engines Limited Engine Names ...

...eled/tracked or vehicles or "bollard pull" of boats or the "thrust" of jet engines when a proper "test rig" is designed and constructed to provide "frictionle ...

...rcraft)|attitude control]]. Exhaust vanes and [[Gimbaled thrust|gimbaled]] engines were used in the 1930s by [[Robert H. Goddard|Robert * Exhaust vanes, also known as jet vanes ...

[[File:Zoelly turbine, section (Heat Engines, 1913).jpg|thumb|180px| Multistage turbine.]] [[Category:Jet engines]] ...

...rbines do not require a pressure casement around the rotor since the fluid jet is created by the nozzle prior to reaching the blades on the rotor. [[Newto ...are sometimes referred to as turbine engines to distinguish between piston engines.<ref>{{cite book |title=A Dictionary of Aviation |first=David W. |last=Wrag ...

.../26/E9-6221/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes|publisher=Federal Aviation Administration (FAA ...Some [[constant-speed propeller]]s, such as those of the [[Argus As 410]] engines used in the [[Focke-Wulf Fw 189]], used a propeller turbine on the [[spinne ...

...on machines as textile machinery, compressors, agricultural machinery, and engines for ships. ...de by the inventors themselves. Early in the 18th century, the first steam engines, the [[Newcomen engine]], came into use throughout Britain and Europe, prin ...

...ts a liquid jet through its apex. [[Varicose wave]]s on the surface of the jet lead to the formation of small and highly charged liquid droplets, which ar ...veral electrospray operating regimes (dripping, burst, pulsating, and cone-jet). A few years later, Zeleny captured the first time-lapse images of the dyn ...

| in airbreathing [[jet engine]]s it is improved by using more inert air for propulsion (i.e. lower | for shaft engines less fuel use for a given output power means higher efficiency ...