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- Specific_impulse abstract "Specific impulse (usually abbreviated Isp) is a measure of the efficiency of rocket and jet engines. By definition, it is the impulse delivered per unit of propellant consumed, and is dimensionally equivalent to the thrust generated per unit propellant flow rate. If mass (kilogram or slug) is used as the unit of propellant, then specific impulse has units of velocity. If weight (newton or pound) is used instead, then specific impulse has units of time (seconds). The conversion constant between these two versions is the standard gravitational acceleration constant (g0). The higher the specific impulse, the lower the propellant flow rate required for a given thrust, and in the case of a rocket, the less propellant needed for a given delta-v, per the Tsiolkovsky rocket equation.Specific impulse is a useful value to compare engines, much like miles per gallon or liters per 100 kilometers is used for cars. A propulsion method and system with a higher specific impulse is more propellant-efficient. While the unit of seconds can seem confusing to laypeople, it is fairly simple to understand as "hover-time": how long a rocket can "hover" before running out of fuel, given the weight of that propellant/fuel. Of course, the weight of the rocket has to be taken out of consideration and so does the reduction in fuel weight as it's expended; the basic idea is "how long can any given amount of x hold itself up". Obviously that must mean "...against Earth's gravity", which means nothing in non-Earth conditions; hence Isp being given in velocity when propellant is measured in mass rather than weight, and the question becomes "how fast can any given amount of x accelerate itself?"Note that Isp describes efficiency in terms of amount of propellant, and does not include the engine, structure or power source. Higher Isp means less propellant needed to impart a given momentum. Some systems with very high Isp (cf. ion thrusters) may have relatively very heavy/massive power generators, and produce thrust over a long period; thus, while they are "efficient" in terms of propellant mass carried, they may actually be quite poor at delivering high thrust as compared to "less efficient" engine/propellant designs.Another number that measures the same thing, usually used for air breathing jet engines, is specific fuel consumption. Specific fuel consumption is inversely proportional to specific impulse and the effective exhaust velocity. The actual exhaust velocity is the average speed of the exhaust jet, which includes fuel combustion products, nitrogen, and argon, as it leaves air breathing engine. The effective exhaust velocity is the exhaust velocity that the combusted fuel and atmospheric oxygen only would need to produce the same thrust. The two are identical for an ideal rocket working in vacuum, but are radically different for an air-breathing jet engine that obtains extra thrust by accelerating the non-combustible components of the air. Specific impulse and effective exhaust velocity are proportional.".
- Specific_impulse wikiPageExternalLink software.lpre.de.
- Specific_impulse wikiPageExternalLink propel.htm.
- Specific_impulse wikiPageID "40250".
- Specific_impulse wikiPageLength "24529".
- Specific_impulse wikiPageOutDegree "87".
- Specific_impulse wikiPageRevisionID "681632065".
- Specific_impulse wikiPageWikiLink Air-breathing_jet_engine.
- Specific_impulse wikiPageWikiLink Airbreathing_jet_engine.
- Specific_impulse wikiPageWikiLink Category:Classical_mechanics.
- Specific_impulse wikiPageWikiLink Category:Engine_technology.
- Specific_impulse wikiPageWikiLink Category:Physical_quantities.
- Specific_impulse wikiPageWikiLink Category:Rocket_propulsion.
- Specific_impulse wikiPageWikiLink Category:Spacecraft_propulsion.
- Specific_impulse wikiPageWikiLink Delta-v.
- Specific_impulse wikiPageWikiLink Delta-v_(physics).
- Specific_impulse wikiPageWikiLink Delta_v.
- Specific_impulse wikiPageWikiLink Dimensional_analysis.
- Specific_impulse wikiPageWikiLink Effective_exhaust_velocity.
- Specific_impulse wikiPageWikiLink Energy_density.
- Specific_impulse wikiPageWikiLink English_unit.
- Specific_impulse wikiPageWikiLink English_units.
- Specific_impulse wikiPageWikiLink Estes_Industries.
- Specific_impulse wikiPageWikiLink Flow_rate.
- Specific_impulse wikiPageWikiLink Fluorine.
- Specific_impulse wikiPageWikiLink Gravitational_potential.
- Specific_impulse wikiPageWikiLink Gravity_potential.
- Specific_impulse wikiPageWikiLink Hall_effect_thruster.
- Specific_impulse wikiPageWikiLink Heat_of_combustion.
- Specific_impulse wikiPageWikiLink Heating_value.
- Specific_impulse wikiPageWikiLink Hydrogen.
- Specific_impulse wikiPageWikiLink Imperial_units.
- Specific_impulse wikiPageWikiLink Impulse_(physics).
- Specific_impulse wikiPageWikiLink Ion_thruster.
- Specific_impulse wikiPageWikiLink Jet_engine.
- Specific_impulse wikiPageWikiLink Liquid_rocket_propellant.
- Specific_impulse wikiPageWikiLink Liquid_rocket_propellants.
- Specific_impulse wikiPageWikiLink Lithium.
- Specific_impulse wikiPageWikiLink Mass.
- Specific_impulse wikiPageWikiLink Mass_flow_rate.
- Specific_impulse wikiPageWikiLink Metre_per_second.
- Specific_impulse wikiPageWikiLink Momentum.
- Specific_impulse wikiPageWikiLink Newton_(unit).
- Specific_impulse wikiPageWikiLink Newtons_laws_of_motion.
- Specific_impulse wikiPageWikiLink Newtons_second_law.
- Specific_impulse wikiPageWikiLink Nuclear_thermal_rocket.
- Specific_impulse wikiPageWikiLink Oberth_effect.
- Specific_impulse wikiPageWikiLink Oxidizer.
- Specific_impulse wikiPageWikiLink Oxidizing_agent.
- Specific_impulse wikiPageWikiLink Physical_constant.
- Specific_impulse wikiPageWikiLink Pound_(force).
- Specific_impulse wikiPageWikiLink Pound_(mass).
- Specific_impulse wikiPageWikiLink Propellant.
- Specific_impulse wikiPageWikiLink Rocket_engine.
- Specific_impulse wikiPageWikiLink Rocket_fuel.
- Specific_impulse wikiPageWikiLink Rocket_propellant.
- Specific_impulse wikiPageWikiLink SMART-1.
- Specific_impulse wikiPageWikiLink Second.
- Specific_impulse wikiPageWikiLink Slug_(mass).
- Specific_impulse wikiPageWikiLink Space_Shuttle_Main_Engine.
- Specific_impulse wikiPageWikiLink Space_Shuttle_main_engine.
- Specific_impulse wikiPageWikiLink Spacecraft_propulsion.
- Specific_impulse wikiPageWikiLink Specific_energy.
- Specific_impulse wikiPageWikiLink Specific_impulse.
- Specific_impulse wikiPageWikiLink Specific_thrust.
- Specific_impulse wikiPageWikiLink Standard_gravity.
- Specific_impulse wikiPageWikiLink System-specific_impulse.
- Specific_impulse wikiPageWikiLink Thrust.
- Specific_impulse wikiPageWikiLink Thrust_specific_fuel_consumption.
- Specific_impulse wikiPageWikiLink Tripropellant_rocket.
- Specific_impulse wikiPageWikiLink Tsiolkovsky_rocket_equation.
- Specific_impulse wikiPageWikiLink Turbofan.
- Specific_impulse wikiPageWikiLink Turbojet.
- Specific_impulse wikiPageWikiLink Variable_Specific_Impulse_Magnetoplasma_Rocket.
- Specific_impulse wikiPageWikiLink Variable_specific_impulse_magnetoplasma_rocket.
- Specific_impulse wikiPageWikiLink Velocity.
- Specific_impulse wikiPageWikiLink Volumetric_flow_rate.
- Specific_impulse wikiPageWikiLink Weight.
- Specific_impulse wikiPageWikiLink File:Specific-impulse-kk-20090105.png.
- Specific_impulse wikiPageWikiLinkText "I".
- Specific_impulse wikiPageWikiLinkText "Impulse".
- Specific_impulse wikiPageWikiLinkText "Isp".
- Specific_impulse wikiPageWikiLinkText "Specific impulse".
- Specific_impulse wikiPageWikiLinkText "Specific impulse#Specific_impulse_as_a_speed_.28effective_exhaust_velocity.29".
- Specific_impulse wikiPageWikiLinkText "Specific impulse, vac.".
- Specific_impulse wikiPageWikiLinkText "effective exhaust velocity".
- Specific_impulse wikiPageWikiLinkText "efficiency".
- Specific_impulse wikiPageWikiLinkText "efficient".
- Specific_impulse wikiPageWikiLinkText "isp".
- Specific_impulse wikiPageWikiLinkText "performance of the rocket motor".
- Specific_impulse wikiPageWikiLinkText "seconds".
- Specific_impulse wikiPageWikiLinkText "specific Impulse".
- Specific_impulse wikiPageWikiLinkText "specific impulse".
- Specific_impulse wikiPageWikiLinkText "specific impulse()".
- Specific_impulse wikiPageWikiLinkText "specific impulses".
- Specific_impulse wikiPageWikiLinkText "specific-impulse".
- Specific_impulse wikiPageWikiLinkText "superior".
- Specific_impulse wikiPageWikiLinkText "twice as efficient".
- Specific_impulse hasPhotoCollection Specific_impulse.
- Specific_impulse wikiPageUsesTemplate Template:Citation_needed.