Talk:Ballonet

The name
comes obviously from French ballonet for "small balloon" --93.111.97.44 (talk) 19:34, 21 March 2010 (UTC) (Helium4) --Helium4 (talk) 19:35, 21 March 2010 (UTC)

i would like to raise a flag about this explanation "when inflated, reduces the volume available for the lifting gas, making it more dense". this seems to be implying that inflating the ballonet compresses the lifting gas and this contributes to a reduction in lift. i don't think this is correct. i think that the decrease in lift is due entirely to your second half of the explanation, that is, that taking on board air from outside the airship increases the average density of the airship therefore it gets less buoyant lift i.e. the airship is simply heavier. what matters for the buoyant lift of the airship is the average density which is the total volume of the balloon i.e. outer envelope divided by total weight. if the ballonet expands within the volume of the outer envelope then the total volume stays the same and the weight goes up increasing average density. if anything, the ballonet would press on the interior side of the outer envelope and possibly cause it to expand insignificantly thereby increasing total volume. maybe i am wrong but i am confused why compressing the lifting gas is part of the mechanism for decreasing buoyancy.

thanks.

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