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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 total impulse (or change in momentum) delivered per unit of propellant consumed, and is dimensionally equivalent to the thrust generated divided by the 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). Multiplying by the gravitational constant (g0) converts it from the weight basis to the mass basis.A propulsion method and system with a higher specific impulse uses the mass or weight of the propellant more efficiently in creating forward thrust, and in the case of a rocket, the less propellant needed for a given delta-v, per the Tsiolkovsky rocket equation. In rockets, this does necessarily mean the engine is more efficient at gaining altitude, distance, or velocity. This is because if an engine burns the propellant faster, the rocket has less weight for a longer period of time, which makes better use of the total force times time that was acquired from the propellant. This is much less of a consideration in jet engines that employ wings and outside air for combustion to carry payloads that are much heavier than the propellant. Specific impulse includes the contribution to impulse provided by external air that has been used for combustion and is exhausted with the spent propellant. Jet engines using outside air therefore have a much higher specific impulse than rocket engines. The specific impulse in terms of propellant mass spent (multiplying the weight-based Isp in seconds by g0) is in units of distance per time which is an artificial velocity called the \"effective exhaust velocity\". This is higher than the actual exhaust velocity because the mass of the combustion air is not being accounted for. Actual and effective exhaust velocity are the same in rocket engines not utilizing air. Specific impulse is inversely proportional to specific fuel consumption by the relationship Isp=1/(go*SFC) for SFC in kg/N-s and Isp = 3600/SFC for SFC in lb/lbf-hr.".
- Specific_impulse wikiPageExternalLink propel.htm.
- Specific_impulse wikiPageExternalLink software.lpre.de.
- Specific_impulse wikiPageID "40250".
- Specific_impulse wikiPageLength "24282".
- Specific_impulse wikiPageOutDegree "85".
- Specific_impulse wikiPageRevisionID "707604638".
- 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 Dimensional_analysis.
- Specific_impulse wikiPageWikiLink Energy_density.
- Specific_impulse wikiPageWikiLink English_units.
- Specific_impulse wikiPageWikiLink Estes_Industries.
- Specific_impulse wikiPageWikiLink Fluorine.
- Specific_impulse wikiPageWikiLink Gravitational_potential.
- Specific_impulse wikiPageWikiLink Hall-effect_thruster.
- Specific_impulse wikiPageWikiLink Heat_of_combustion.
- 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 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 Nuclear_thermal_rocket.
- Specific_impulse wikiPageWikiLink Oberth_effect.
- 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_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 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 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, SL".
- Specific_impulse wikiPageWikiLinkText "Specific Impulse, Vac".
- Specific_impulse wikiPageWikiLinkText "Specific impulse".
- Specific_impulse wikiPageWikiLinkText "Specific impulse#Specific_impulse_as_a_speed_.28effective_exhaust_velocity.29".
- Specific_impulse wikiPageWikiLinkText "effective exhaust velocity".
- Specific_impulse wikiPageWikiLinkText "efficiency".
- Specific_impulse wikiPageWikiLinkText "efficient".
- Specific_impulse wikiPageWikiLinkText "exhaust velocity".
- Specific_impulse wikiPageWikiLinkText "isp".
- Specific_impulse wikiPageWikiLinkText "seconds".
- Specific_impulse wikiPageWikiLinkText "specific Impulse".
- Specific_impulse wikiPageWikiLinkText "specific impulse ()".
- Specific_impulse wikiPageWikiLinkText "specific impulse".
- Specific_impulse wikiPageWikiLinkText "specific impulse()".
- Specific_impulse wikiPageWikiLinkText "specific-impulse".
- Specific_impulse wikiPageWikiLinkText "superior".
- Specific_impulse wikiPageWikiLinkText "twice as efficient".
- Specific_impulse wikiPageUsesTemplate Template:Citation_needed.
- Specific_impulse wikiPageUsesTemplate Template:Div_col.
- Specific_impulse wikiPageUsesTemplate Template:Div_col_end.
- Specific_impulse wikiPageUsesTemplate Template:Math.
- Specific_impulse wikiPageUsesTemplate Template:Reflist.
- Specific_impulse wikiPageUsesTemplate Template:Specific_impulse_examples.
- Specific_impulse wikiPageUsesTemplate Template:Thrust_engine_efficiency.
- Specific_impulse wikiPageUsesTemplate Template:Tone.
- Specific_impulse wikiPageUsesTemplate Template:Use_dmy_dates.
- Specific_impulse subject Category:Classical_mechanics.
- Specific_impulse subject Category:Engine_technology.
- Specific_impulse subject Category:Physical_quantities.
- Specific_impulse subject Category:Rocket_propulsion.
- Specific_impulse subject Category:Spacecraft_propulsion.