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ZF Navy free balloon

No change in size, 20:46, 6 June 2010
Improved structure.
* F/f - Open/close the gas valve.
* R - Rip the envelope. Use only close to the ground and when you really really want to stay there.
==External links==
* [http://www.gasballooning.net/BT-2361.pdf Theory of Ballooning, War Department, 25 Apr, 1940]. The basics in 13 pages.
[[Category:Historical aircraft]]

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