Oberth effect

E1000696

astrodynamics concept physical effect

The Oberth effect is a principle in astrodynamics where a rocket produces more useful kinetic energy from the same amount of propellant when it performs a burn at higher speeds, typically near a gravitational body.

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Statements (48)

Predicate	Object
instanceOf	astrodynamics concept ⓘ physical effect ⓘ
appliesTo	chemical rockets ⓘ electric propulsion systems ⓘ rockets ⓘ spacecraft propulsion ⓘ
basedOn	classical mechanics ⓘ conservation of energy ⓘ kinetic energy equation ⓘ
category	orbital maneuvers ⓘ rocket propulsion phenomena ⓘ spaceflight mechanics ⓘ
consequenceOf	kinetic energy scaling with the square of velocity ⓘ nonlinear relationship between velocity and energy ⓘ
contrastsWith	naive delta-v-only mission optimization ⓘ
describedByFormula	ΔE = 1/2 m[(v+Δv)^2 − v^2] = m v Δv + 1/2 m (Δv)^2 ⓘ
field	astrodynamics ⓘ orbital mechanics ⓘ spaceflight dynamics ⓘ
hasKeyIdea	a rocket produces more useful kinetic energy when burning propellant at higher speed ⓘ burns deep in a gravity well can be more energetically efficient ⓘ energy gain from a burn depends on current velocity as well as delta-v ⓘ kinetic energy change is proportional to velocity times delta-v ⓘ performing a burn near periapsis maximizes kinetic energy gain ⓘ
historicallyAttributedTo	Hermann Oberth NERFINISHED ⓘ
implies	deep-space burns at low speed are less energy-efficient than periapsis burns ⓘ for the same delta-v, more energy is gained at higher initial speed ⓘ
namedAfter	Hermann Oberth NERFINISHED ⓘ
occursNear	gravitational bodies ⓘ periapsis of an orbit ⓘ
optimizationGoal	maximize energy gain per unit propellant ⓘ
practicalImplication	combine gravity assists with high-speed burns for large energy changes ⓘ perform major burns at the lowest possible orbital altitude ⓘ time burns to coincide with periapsis passage ⓘ
relatedTo	Hohmann transfer orbit NERFINISHED ⓘ Tsiolkovsky rocket equation NERFINISHED ⓘ bi-elliptic transfer ⓘ delta-v budget ⓘ gravity assist ⓘ specific orbital energy ⓘ
timePeriod	early 20th century ⓘ
typicalLocation	low Earth orbit ⓘ periapsis of interplanetary transfer orbits ⓘ
usedIn	bi-elliptic transfer planning ⓘ capture maneuvers at planets ⓘ escape trajectory design ⓘ gravity assist maneuvers ⓘ interplanetary mission design ⓘ

Referenced by (1)

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Tsiolkovsky rocket equation → relatedTo → Oberth effect ⓘ