Vertical rocket landing via helium ?

[JustJoe]

Would a helium filled rocket ''top section'' help the rocket to vertically land ? 

[Bufofrog]

No.  If the top section weighs 3,300 kg with air inside, then replacing the air with helium would mean the top section would now weight about 3,300 kg.

[Sensei]

You would have to have liquid helium containers and balloons that are popped from the top and filled with gaseous helium (after it's heated) for this to make any sense.

[swansont]

The buoyancy of helium as compared to air at 1 atm is about a gram per liter. So 1000 liters will lift a kg.