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The 'Mythbusters' did it as well.. well sort of..
Should you need to reduce lift, either to land or prevent yourself from flying too high, the only option is to burst some of the balloons, and should you fly too high, the balloons will burst anyway. Once the balloons have been burst, there's no way of re-inflating them once you've descended to lower levels and require more lift (due to the increased air pressure making the balloons less buoyant), even if you were carrying additional lifting gas.
I've changed my mind about trying this. Maybe I could start with my cat... 
Quote from: Herman Melville on 04/06/2009 11:22:43I've changed my mind about trying this. Maybe I could start with my cat... I'd stick to using balloons
The 'Mythbusters' did it as well.. well sort of..long live lawnchair larry.
Would I be right in assuming you have a particular mangy moggy in mind?
We had to work this out for Radio Cambridgeshire once, they were considering flying one of their presenters around the car park. I cant remember the actual figures (I'll ask Dave) but it was well over £1000 worth of helium.The decided against it, so your licence fee is safe with them...