View source for Ader Avion II

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{{Infobox aircraft
 | name=Avion II
 | image=Moteur Ader 1892 developed for Avion II.jpg
 | caption=Ader's 1892 steam engine, called ''Zéphyr'', developed for Avion II, on display at the [[Musée de l'Air et de l'Espace]].
 | type=Pioneer aircraft
 | national_origin= [[France]]
 | manufacturer=
 | designer=[[Clément Ader]]<ref name=Opdyke>{{cite book|last=Opdyke|first=Leonard E.|title=French Aeroplanes before the Great War|year=1999|publisher=Schiffer Military History|location=Atglen, PA|isbn=0 7643 0752 5|author-link=Leonard E. Opdycke}}</ref> 
 | first_flight=
 | introduction=
 | retired=
 | status=
 | primary_user=
 | more_users= <!--Limited to three in total; separate using <br /> -->
 | produced= <!--years in production-->
 | number_built= 1 partially completed<ref name=Opdyke/>
 | program cost= <!--Total program cost-->
 | unit cost= <!--Incremental or flyaway cost for military or retail price for commercial aircraft-->
 | developed_from= [[Ader Eole]]<ref name=Opdyke/>
 | variants=
}}

The '''''Avion II''''' (originally referred to as the '''''Zephyr''''' (west wind) or the '''''Éole II''''') was the second primitive [[aircraft]] designed by [[Clément Ader]] in 1893.<ref name=Opdyke/> Most sources agree that work on it was never completed, Ader abandoning it in favour of the [[Ader Avion III|Avion III]] that had a financial backer. Ader's later claim that he flew the Avion II in August 1892 for a distance of 100 m at a field in Satory is not widely accepted.{{citation needed|date=January 2013}}

==Design and development==
The name "Avion" was devised by Ader from Latin ''avis'' ("bird") and became the origin of the word ''[[wikt:avion|avion]]'', the most common in French to designate an airplane (heavier-than-air aircraft). The first official text noting it is French patent no. 205 555 granted to Ader on April 19, 1890.{{citation needed|date=October 2011}}

The engine developed for Avion II, called ''Zéphyr'' was a light [[steam engine]] driving a {{convert|3|m|ft|abbr=on|0}} diameter 4-bladed propeller, in which steam was cooled through a condenser. It yielded {{convert|30|hp|kW|abbr=on|0|disp=flip}} at 480 rpm at a pressure of {{convert|15|Pa|psi|abbr=on|2}}, weighing {{convert|33|kg|lb|abbr=on|0}} dry, and {{convert|134|kg|lb|abbr=on|0}} with full boiler and accessories.<ref name=Opdyke/>
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==See also==
{{aircontent
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|see also=
|related=[[Ader Eole]]
|similar aircraft=[[Ader Avion III]]
|lists=<!-- related lists -->
}}

==Notes==
{{reflist}}

==References==
{{refbegin}}
*{{cite book|last=Opdyke|first=Leonard E.|title=French Aeroplanes before the Great War|year=1999|publisher=Schiffer Military History|location=Atglen, PA|isbn=0 7643 0752 5}}
{{refend}}
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{{Ader aircraft}}

{{DEFAULTSORT:Ader Avion Ii}}
[[Category:19th-century French experimental aircraft]]
[[Category:Steam-powered aircraft]]
[[Category:Unflown aircraft]]