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Repulsor-craft are land-based (usually) vehicles designed to levitate above the surface during operational use.

Is there a technical limit to the achievable height? Most seem to hover just slightly above the surface, but Separatist STAPs have been seen on Teth being used like an airborne infantry vehicle high above the surface.

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Repulsorlift technology has no height limit except the one imposed by the gravity well

STAP

STAPs are lightweight reconnaissance and patrol vehicles used by the battle droids of the Trade Federation army (and later, the Separatist Alliance). Incorporating repulsorlift technology, the STAP (single trooper aerial platform) is a slim, agile craft sporting a pair of blaster cannons. STAPs are often deployed as support vehicles in conjunction with larger craft.

Encyclopedia (StarWars.com)

That was your example of a craft levitated to great heights with repulsorlift but there are other, much heavier vehicles, with that technology:

So it seems there is no limit to the achievable height with an amount of repulsor engines large enough... except possibly one: the size of the gravity well. Repulsor technology seems to work pushing against a gravity so it doesn't work that well as gravity comes close to 0. Yet Core Ships can escape orbit in planets the likes of Geonosys and we don't know any example of a height limit in a smaller planet.

Edit: As pointed in the comments the list of ships with repulsor technology is larger and respulsors can be powerful enough to even be weaponized with large destruction as a result.

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    Just to add, there are other, even heavier things that seem to be able to enter atmosphere and hover using repulsors - Core Ships for Lucrehulk Battleships use repulsors almost constantly and then actually take off. We saw an Imp-Class SD hover over Jedha in Rogue One, Acclamators regularly land and take off. – Wraith Leader Jul 13 '17 at 14:06
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    @WraithLeader And in Legends, you have a repulsor powerful enough to destroy stars. – JAB Jul 13 '17 at 15:41
  • @JAB what was that one called? I remember sun crusher but that used resonance torpedos – Wraith Leader Jul 13 '17 at 15:57
  • @WraithLeader Centerpoint Station. – JAB Jul 13 '17 at 16:07
  • @JAB The planets of the Corellian system where the ones with repulsors on their surface capable of destroying the Centerpoint Station. The Station used a not well understood technology based on tractor beams – Ram Jul 13 '17 at 16:36

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