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See all on WikipediaPropulsive efficiency - Wikipedia
Propulsive efficiency is defined as the ratio of propulsive power (i.e. thrust times velocity of the vehicle) to work done on the fluid. In generic terms, the propulsive power can be calculated as follows: $${\displaystyle P_{prop}=T\times v_{\infty }}$$ where $${\displaystyle T}$$ represents thrust and … See more
In aerospace engineering, concerning aircraft, rocket and spacecraft design, overall propulsion system efficiency $${\displaystyle \eta }$$ See more
• Vehicular metrics – Metrics that denote the relative capabilities of various vehicles
• Specific fuel consumption (thrust) – Fuel efficiency of an … See moreMost aerospace vehicles are propelled by heat engines of some kind, usually an internal combustion engine. The efficiency of a heat engine relates how much useful work is output for a … See more
Wikipedia text under CC-BY-SA license Spacecraft propulsion - Wikipedia
The technology areas are divided into four basic groups: (1) Chemical propulsion, (2) Electric propulsion, (3) Advanced propulsion technologies, and (4) Supporting technologies; based on the physics of the propulsion system and how it derives thrust as well as its technical maturity. Additionally, there may be credible meritorious in-space propulsion concepts not foreseen or reviewed a…
Wikipedia · Text under CC-BY-SA license- Estimated Reading Time: 9 mins
Propulsion - Wikipedia
WEBPropulsion is the generation of force by any combination of pushing or pulling to modify the translational motion of an object, which is typically a rigid body (or an articulated rigid …
- Estimated Reading Time: 10 mins
Propeller theory - Wikipedia
WEBPropeller theory is the science governing the design of efficient propellers. A propeller is the most common propulsor on ships, and on small aircraft. History. In the second half of the …
- Estimated Reading Time: 11 mins
Jet engine performance - Wikipedia
WEBA propulsion device, a nozzle, has to be added to a gas turbine engine to convert its energy into thrust. The efficiency of this conversion (Froude or propulsive efficiency) reflects …
Marine propulsion - Wikipedia
WEBAs modern ships' propellers are at their most efficient at the operating speed of most slow speed diesel engines, ships with these engines do not generally need gearboxes. Usually such propulsion systems consist …
Jet propulsion - Wikipedia
WEBJet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction. By Newton's third law, the moving body is propelled in the opposite direction to the jet.
Why this formula says jet engine is efficient at any speed?
WEBThis is the so called Propulsive efficiency! It is the main factor for new engines. The smaller the difference between the flight velocity and the jet stream velocity, the higher …
11.7 Performance of Propellers - MIT
WEBIn practice, the propulsive efficiency typically peaks at a level of around 0.8 for a propeller before various aerodynamic effects act to decay its performance as will be shown in the following section.
Plasma propulsion engine - Wikipedia
WEBA plasma propulsion engine is a type of electric propulsion that generates thrust from a quasi-neutral plasma. This is in contrast with ion thruster engines, which generate thrust …
WEB• The overall efficiency of a chemical rocket can be defined as the ratio of the useful energy over the chemical energy stored in the propellant – Qprop is the heat of combustion per …
UNIFIED PROPULSION LECTURE #1 - MIT
WEBIn the first lecture we arrived at general expressions that related the thrust of a propulsion system to the net changes in momentum, pressure forces, etc. Now we will look at how …
UNIFIED PROPULSION 3 - MIT OpenCourseWare
WEBIn the first lecture we arrived at general expressions that related the thrust of a propulsion system to the net changes in momentum, pressure forces, etc. Now we will look at how …
Electric motor - Wikipedia
WEBAn industrial electric motor. An electric motor is an electrical machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction …
Beginner's Guide to Propulsion - NASA
WEBMay 13, 2021 · Propulsion means to push forward or drive an object forward. A propulsion system is a machine that produces thrust to push an object forward. On airplanes, thrust …
Jet Propulsion/Propulsive efficiency - Wikibooks
WEBMar 28, 2019 · The propulsive efficiency is defined as: The mechanical work generated by the engine is crudely split between the work difference between the input and exit mass …
4.0 In-Space Propulsion - NASA
WEBMar 14, 2024 · The propulsion system enables detumbling and pointing for communication back to Earth. The propulsion system uses a 3D-printed propellant tank to reduce part …
WEBspacecraft propulsion. With literally hundreds of electric thrusters now operating in orbit on communications satellites, and ion and Hall thrusters both having been successfully …
Propulsive efficiency | mechanics | Britannica
WEBThe efficiency of a propulsor, propulsive efficiency η p, is the portion of the available energy that is usefully applied in propelling the aircraft compared to the total energy of …
Air-independent propulsion - Wikipedia
WEBAir-independent propulsion (AIP), or air-independent power, ... Warfare Magazine notes that: "although MESMA can provide higher output power than the other alternatives, its …
propulsion - Why does this formula say rocket efficiency depends …
WEBApr 29, 2020 · Wikipedia gives the following equation for the efficiency $\eta_p$ of an engine here: $$\eta_p= \frac {2\, (\frac {v} {v_e})} {1 + ( \frac {v} {v_e} )^2 }$$ where $v$ …
What is propulsion efficiency? - Answers
WEBIt is efficiency of the propelling device in converting the applied torque into useful thrust. In an IDEAL propeller the freestream velocity and the slipstream velocity should be same. …
WEBNEAT is a reconfigurable hybrid, gas-electric propulsion testbed capable of supporting full-scale electric aircraft powertrain technology development. NASA Glenn was able to …
Pushing the Limits of Sub-Kilowatt Electric Propulsion …
WEBApr 23, 2024 · Small spacecraft using the NASA-H71M electric propulsion technology will be able to independently maneuver from low-Earth orbit (LEO) to the Moon or even from …
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