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- Oberth_effect abstract "In astronautics, a powered flyby, or Oberth maneuver, describes a maneuver in which a rocket falls into a gravitational well, and then accelerates when its fall reaches maximum speed. The resulting maneuver is actually a more efficient way to gain kinetic energy than applying the same impulse outside of a gravitational well. The gain in efficiency is explained by the Oberth effect, which is that the use of a rocket at high speed generates greater mechanical energy. In practical terms, this means that the most energy efficient time for a spacecraft to burn its engine is at the lowest possible orbital periapse, when its orbital velocity (and so, its kinetic energy) is greatest. In some cases, it is even worth spending fuel on slowing the rocket into a gravity well to take advantage of the efficiencies of the Oberth effect. The maneuver and effect are named after Hermann Oberth, the Austro-Hungarian-born German physicist and a founder of modern rocketry, who first described them in 1927.The Oberth effect is strongest at a point in orbit known as the periapse, where the gravitational potential is lowest, and the speed is highest. This is because firing a rocket engine at high speed causes a greater change in kinetic energy than when fired at lower speed. Because the vehicle remains near periapse only for a short time, for the Oberth maneuver to be most effective, the vehicle must be able to generate as much impulse as possible in as short a time as possible. Thus, the Oberth effect is much more useful for high thrust rockets like liquid-propellant rockets, and less useful for low-thrust reaction engines such as ion drives, which take a long time to gain speed. The Oberth effect also can be used to understand the behavior of multi-stage rockets: the upper stage can generate much more usable kinetic energy than the total chemical energy of the propellants it carries.The effect does not violate the law of conservation of energy. The Oberth effect occurs because the propellant has more usable energy due to its kinetic energy on top of its chemical potential energy. The vehicle is able to employ this kinetic energy to generate more mechanical power.".
- Oberth_effect wikiPageExternalLink adc0888477238597?rnum=131&_done=%2Fgroup%2Frec.arts.sf.science%2Fbrowse_frm%2Fmonth%2F1994-11%3F.
- Oberth_effect wikiPageExternalLink Oberth.html.
- Oberth_effect wikiPageID "13127410".
- Oberth_effect wikiPageLength "10434".
- Oberth_effect wikiPageOutDegree "38".
- Oberth_effect wikiPageRevisionID "681874480".
- Oberth_effect wikiPageWikiLink Apsis.
- Oberth_effect wikiPageWikiLink Astronautics.
- Oberth_effect wikiPageWikiLink Austria-Hungary.
- Oberth_effect wikiPageWikiLink Bi-elliptic_transfer.
- Oberth_effect wikiPageWikiLink Category:Aerospace_engineering.
- Oberth_effect wikiPageWikiLink Category:Astrodynamics.
- Oberth_effect wikiPageWikiLink Category:Rocketry.
- Oberth_effect wikiPageWikiLink Conservation_of_energy.
- Oberth_effect wikiPageWikiLink Delta-v.
- Oberth_effect wikiPageWikiLink Dot_product.
- Oberth_effect wikiPageWikiLink Escape_velocity.
- Oberth_effect wikiPageWikiLink Geoffrey_A._Landis.
- Oberth_effect wikiPageWikiLink Geoffrey_Landis.
- Oberth_effect wikiPageWikiLink Germany.
- Oberth_effect wikiPageWikiLink Gravitational_potential.
- Oberth_effect wikiPageWikiLink Gravitational_well.
- Oberth_effect wikiPageWikiLink Gravity_assist.
- Oberth_effect wikiPageWikiLink Gravity_well.
- Oberth_effect wikiPageWikiLink Hermann_Oberth.
- Oberth_effect wikiPageWikiLink Hyperbolic_trajectory.
- Oberth_effect wikiPageWikiLink Ion_drive.
- Oberth_effect wikiPageWikiLink Ion_thruster.
- Oberth_effect wikiPageWikiLink Liquid-propellant_rocket.
- Oberth_effect wikiPageWikiLink Mechanical_work.
- Oberth_effect wikiPageWikiLink Multi-stage_rocket.
- Oberth_effect wikiPageWikiLink Multistage_rocket.
- Oberth_effect wikiPageWikiLink Parabolic_trajectory.
- Oberth_effect wikiPageWikiLink Periapse.
- Oberth_effect wikiPageWikiLink Periapsis.
- Oberth_effect wikiPageWikiLink Physicist.
- Oberth_effect wikiPageWikiLink Prograde_motion.
- Oberth_effect wikiPageWikiLink Propellant.
- Oberth_effect wikiPageWikiLink Proper_acceleration.
- Oberth_effect wikiPageWikiLink Propulsive_efficiency.
- Oberth_effect wikiPageWikiLink Retrograde_and_prograde_motion.
- Oberth_effect wikiPageWikiLink Rocket.
- Oberth_effect wikiPageWikiLink Rocket_engine.
- Oberth_effect wikiPageWikiLink Specific_energy.
- Oberth_effect wikiPageWikiLink Specific_orbital_energy.
- Oberth_effect wikiPageWikiLink Work_(physics).
- Oberth_effect wikiPageWikiLinkText "Oberth effect".
- Oberth_effect wikiPageWikiLinkText "reduce launcher delta-V (V)".
- Oberth_effect wikiPageWikiLinkText "warping away from a close approach to the Sun".
- Oberth_effect hasPhotoCollection Oberth_effect.
- Oberth_effect wikiPageUsesTemplate Template:Distinguish.
- Oberth_effect wikiPageUsesTemplate Template:Orbits.
- Oberth_effect wikiPageUsesTemplate Template:Portal.
- Oberth_effect wikiPageUsesTemplate Template:Reflist.
- Oberth_effect wikiPageUsesTemplate Template:Rp.
- Oberth_effect subject Category:Aerospace_engineering.
- Oberth_effect subject Category:Astrodynamics.
- Oberth_effect subject Category:Rocketry.
- Oberth_effect type Article.
- Oberth_effect type Aeronautic.
- Oberth_effect type Article.
- Oberth_effect type Astrodynamic.
- Oberth_effect type Ballistic.
- Oberth_effect type Discipline.
- Oberth_effect type Technology.
- Oberth_effect type Thing.
- Oberth_effect comment "In astronautics, a powered flyby, or Oberth maneuver, describes a maneuver in which a rocket falls into a gravitational well, and then accelerates when its fall reaches maximum speed. The resulting maneuver is actually a more efficient way to gain kinetic energy than applying the same impulse outside of a gravitational well. The gain in efficiency is explained by the Oberth effect, which is that the use of a rocket at high speed generates greater mechanical energy.".
- Oberth_effect label "Oberth effect".
- Oberth_effect differentFrom Gravity_assist.
- Oberth_effect sameAs Oberthův_efekt.
- Oberth_effect sameAs Oberth_Effect.
- Oberth_effect sameAs Efecto_Oberth.
- Oberth_effect sameAs Oberth-effektus.
- Oberth_effect sameAs Efeito_Oberth.
- Oberth_effect sameAs m.02z7qx1.
- Oberth_effect sameAs Эффект_Оберта.
- Oberth_effect sameAs Q824852.
- Oberth_effect sameAs Q824852.
- Oberth_effect sameAs 奥伯特效应.
- Oberth_effect wasDerivedFrom Oberth_effect?oldid=681874480.
- Oberth_effect isPrimaryTopicOf Oberth_effect.