Here is what Wikipedia has to say about the Hoover Constellation:

The Hoover Constellation, which is a canister type but lacks wheels. Instead, the vacuum cleaner floats on its exhaust, operating as a hovercraft, although this is not true of the earliest models. They had a swivel top hose with the intention being that the user would place the unit in the center of the room, and work around the cleaner.

Introduced in 1952, they are collectible, and are easily identified by the spherical shape of the canister. They tended to be loud, had poor cleaning power, and could not float over carpets. But they remain an interesting machine; restored, they work well in homes with lots of hardwood floors.

The Constellations were changed and updated over the years until discontinued in 1975. These Constellations route all of the exhaust under the vacuum using a different airfoil. The updated design is quiet even by modern standards, particularly on carpet as it muffles the sound. These models float on carpet or bare floor—although on hard flooring, the exhaust air tends to scatter any fluff or debris around.

Hoover has now re-released an updated version of this later model Constellation in the US (model # S3341 in Pearl White and # S3345 in stainless steel). Changes include a HEPA filtration bag, a 12 amp motor, a suction turbine powered rotating brush floor head, and a redesigned version of the handle, which tended to break.

This same model was marketed in the UK under the Maytag brand, with the model being the Satellite. Same machine, different badges, owing to licensing restrictions.

The 5.2 amp motor on older US units provides respectable suction but they all lack a motorized brush head. Therefore they generally work better on hard floors or short pile rugs. Old units take Hoover type J paper bags but the slightly smaller type S allergen filtration bags can be easily trimmed to fit the retaining notches on the old vacuums. Replacement motors are still available from Hoover US for some models.

Hoover made another hovering vacuum cleaner model called the Celebrity in 1973. It has a flattened “flying saucer” shape. Hoover added wheels to it make it a conventional canister model after a brief run as a hovering vacuum. It uses type H bags.

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