In this answer to the gedankenexperiment question With current state of technology if we wanted how long would it take for newly launched probe to overtake Voyagers? I've seen the term "solar gravity well manouver" mentioned as a way to go fast and catch up to the Voyagers.

If I come up to Jupiter from behind I can pick up some energy in the heliocentric frame via a gravity assist and thereby head out of the solar system faster. But I don't see the utility of heading towards the Sun first before heading out; after a decade wouldn't I just be back at 5.5 AU going the the direction and speed that I could have been had I swung by Jupiter a different way?

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    $\begingroup$ Maybe where isn't stated clear enough. It means "Oberth maneuver" at the Sun, wuth rocket burn at perigelium. $\endgroup$ – Heopps May 21 '20 at 12:13
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    $\begingroup$ @Heopps: Would you like to write that as a proper answer? $\endgroup$ – DrSheldon May 21 '20 at 12:24
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    $\begingroup$ A vehicle barely needs any propellant to escape the solar system at a very high velocity with this technique. A solar sail that doesn't melt during perihelion passage, plus perhaps a bit of propellant for attitude control, are all that are needed. See nasa.gov/pdf/740774main_NosanovSpringSymposium2013.pdf , for example. $\endgroup$ – David Hammen May 21 '20 at 13:28
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    $\begingroup$ Also known as the Oberth-Kupiter maneuver. explainxkcd.com/wiki/index.php/1244:_Six_Words (explainxkcd link because xkcd isn't mobile friendly) $\endgroup$ – Joshua May 21 '20 at 18:35
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    $\begingroup$ It's angular momentum you have to lose to get close to the Sun, not energy. $\endgroup$ – Steve Linton May 21 '20 at 21:10

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