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ZF Navy free balloon

512 bytes added, 21:19, 12 December 2017
Known problems.
{{infobox Aircraft|image =ZF_Navy_free_balloon.jpg|name =ZF Navy free balloon|type =Gas balloon|authors =Anders Gidenstam|fdm =JSBSim|status =Development|fgname =<tt>ZF_Navy_free_balloon<:{{PAGENAME}}/tt>info}} 
This is a US Navy free balloon as used for initial lighter-than-air training during the 1920s to 1940s. It is fairly representative for a type of aircraft that first flew in 1783 and soon afterwards found a shape and construction that it retained (almost) to this day.
==Handling instructions==[[File:ZF_Navy_free_balloon-2.jpg|thumb|right|300px|The ZF Navy free balloon with the envelope shader enabled.]]
===Important controls / keys===
====Flight controls====
* Gas valve
* Ballast
====Ballast====
* W - Weigh-off to 10% of current weight by dropping ballast. Takes about 10 seconds and only works when on the ground.
* D/d - Drop ballast in 1%/0.1% decrements.
====Gas====
* 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.
{{Aerostat}}== Dependencies ==
==External links==This aircraft depends on instruments from some other aircraft (for FlightGear 2.6.0 and above). Install these too.
* [http://www.gasballooning.net/resources.htm A very good resource for information about and instructions for gas ballooning[Short Empire]]* [[Supermarine Spitfire|Spitfire II]]* [[Supermarine Spitfire Mk IX|Spitfire IX]]* [[ZLT-NT]]. Has links to couple of (old but good) books available in PDF format.
* [http://www.gasballooning.net/BT-2361.pdf Theory of Ballooning, War Department, 25 Apr, 1940]. The basics in 13 pages.== Known problems ==
* The balloon envelope shader doesn't show over MP unless the property /sim/rendering/shaders/aircraft/balloon-envelope/quality-level is manually set to 1. The property might no longer be visible in the shader settings dialog also when the ZF Navy free balloon is the user's aircraft. == External links ==* [[Categoryhttps://web.archive.org/web/20150504200058/http:Aircraft]//www.gasballooning.net/resources.htm A very good resource for information about and instructions for gas ballooning]. Has links to couple of (old but good) books available in PDF format.* [[Categoryhttps:Balloons]//web.archive.org/web/20110103124518/http://www.gasballooning.net/BT-2361.pdf Theory of Ballooning, War Department, 25 Apr, 1940]. The basics in 13 pages.[[Category:Historical aircraft]]{{Aerostat}}
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