• It is somewhat complex. Good year type blimps are designed with propellers that can "push" the blimp down near 100% vertical "land". However a blimp can not just "land" on its own, it requires a ground crew who grab ropes dropped by the blimp and they guide it to a rig (mooring mast) that attaches to the nose to "anchor" the blimp in place. The pilot maneuvers the blimp while close to the ground helping the ground team control and pull it to the mooring mast. Earlier models would "vent" lift gas (hydrogen or helium) to increase the weight of the blimp to make it heavy enough to "land" they still required a good deal of ground people hanging on ropes. the Modern blimp pumps normal air into bladders (Ballast bladders) inside the blimp to cause the weight of the craft to go from neutral to positive. I think some models would pump lift gas (hydrogen or helium) into tanks - compressing the gas takes away its lift and makes it act like ballast.

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