Potez IX

{{Infobox aircraft | name = Potez IX | logo = | logo_size = | image = Potez IX L'Aéronautique December 1922.jpg | alt = | caption = | long_caption = | other_names = | aircraft_type = Airliner | aim = | outcome = | related = | national_origin = France | manufacturer = [[Potez]] | design_group = | designer = | builder = | issuer = | status = | owners = | primary_user = | more_users = | service = | major_applications = | proposals = | prototypes = | number_built = 30 | construction_number = | civil_registration = | military_serial = | radio_code = | requirement = | aircraft_carried = | flights = | total_hours = | total_distance = | construction_date = | introduction = | retired = | first_flight = 1920 | initiated = | in_service = | last_flight = | expected = | developed_from = [[SEA IV]] | variants = | developed_into = | preservation = | fate = | predecessors = | successors = | concluded = }}

The '''Potez IX''' was an early airliner produced in France in the 1920s, a further development of the [[SEA IV]] that [[Henry Potez]] had co-designed during the First World War.<ref name="JEA">Taylor 1989, p.747</ref><ref name="IEA">''The Illustrated Encyclopedia of Aircraft'', p.2760</ref>

==Design and development== The design mated an entirely new fuselage to the wing and tail structures of the earlier military aircraft.<ref name="JEA"/><ref name="IEA"/><ref name="Paris 841">"The Paris Aero Show 1921" 22 December 1921, p.841</ref> This fuselage was very deep, nearly filling the interplane gap, and carried within it a fully enclosed cabin with seating for four passengers.<ref name="JEA"/><ref name="IEA"/><ref name="Paris 841"/> The nose area was carefully streamlined<ref name="IEA"/> with curved aluminium,<ref name="Paris 764">"The Paris Aero Show 1921" 17 November 1921, p. [https://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200764.html 764]</ref> but other aspects of the construction were conventional for the day; wooden structures skinned in plywood (the passenger cabin) or fabric (the rest of the aircraft).<ref name="Paris 842">"The Paris Aero Show 1921" 22 December 1921, p.842</ref> The pilot sat in an open cockpit aft of the cabin.<ref name="IEA"/><ref name="Paris 842"/>

The prototype flew in 1920,<ref name="stdp176">Stroud 1966, p. 176</ref> and was followed by around thirty production examples that differed from it in having a larger tail fin and rudder.<ref name="IEA"/> The [[Compagnie générale transaérienne]] operated Potez IXs on cross-channel air services between Paris and London.<ref name="stdp176"/> The [[Compagnie Franco-Roumaine de Navigation Aérienne]] flew these<ref name="Paris 842"/> on routes linking Paris to [[Warsaw]] via [[Strasbourg]] and [[Prague]], and from Paris to [[Budapest]] via Strasbourg and [[Vienna]], later extending its services to [[Bucharest]] and [[Constantinople]].<ref name="stdp176"/> Franco-Roumaine, and its successor airline CIDNA operated the Potez IX until 1928.<ref name="JEA"/><ref name="stdp177">Stroud 1966, p. 177</ref>

The '''Potez IX S''', a one-off modified version with wings of larger area,<ref name="IEA"/> flew in the Grand Prix de l'Aéro Club de France in June 1921 with [[Gustave Douchy]] at the controls.<ref name="Grand Prix">"The French Aero Club Grand Prix", p.430</ref> Douchy was disqualified in the third stage of the competition.<ref name="Grand Prix"/>

==Specifications== [[File:Potez_IX_3-view_Les_Ailes_December_29,1921.png|thumb|Potez IX 3-view Drawing from Les Ailes December 29,1921]] {{Aircraft specs |ref="The Paris Aero Show 1921" 22 December 1921, p.842 |prime units? = met |crew=One pilot |capacity=4 passengers |length m=9.80 |length ft=32 |length in=2 |span m=14.00 |span ft=46 |span in=0 |height m=3.12 |height ft=10 |height in=3 |wing area sqm=46.0 |wing area sqft=495 |empty weight kg=1,250 |empty weight lb=2,750 |gross weight kg=2,050 |gross weight lb=2,511 |eng1 number=1 |eng1 name=[[Lorraine-Dietrich 12Da]] |eng1 kw=280 |eng1 hp=370 |max speed kmh=200 |max speed mph=125 |ceiling m=6,100 |ceiling ft=20,000 |climb rate ms=4.2 |climb rate ftmin=820 }}  {{aircontent  |see also= |related= |similar aircraft= |lists= }}

==Notes== {{reflist}}

==References== {{commons category|Potez IX}} *{{cite magazine |last=Coroller|first=Jean-Louis|title=Les premièrs avions Henry Potez (première partie)|magazine=Avions: Toute l'aéronautique et son histoire |date=September 1998 |issue=66|pages=8–14 |trans-title=The First Aircraft of Henry Potez|language=French |issn=1243-8650}} * {{cite magazine |title=The French Aero Club Grand Prix |magazine=[[Flight International|Flight]] |date=23 June 1921 |url=https://archive.org/details/sim_flight-international_1921-06-23_13_25/page/430/mode/2up |pages=430 |access-date=2021-10-29}} * {{cite book |title=The Illustrated Encyclopedia of Aircraft |publisher=Aerospace Publishing|location=London }} * {{cite book| last=Stroud |first= John |title= European Transport Aircraft since 1910 |year=1966 |publisher=Putnam |location= London}} * {{cite magazine |title=The Paris Aero Show 1921 |magazine=[[Flight International|Flight]] |date=17 November 1921 |url=https://archive.org/details/Flight_International_Magazine_1921-11-17-pdf/page/n11/mode/2up |pages=758–765|access-date=2021-10-29}} * {{cite magazine |title=The Paris Aero Show 1921 |journal=[[Flight International|Flight]] |date=22 December 1921 |url=https://archive.org/details/Flight_International_Magazine_1921-12-22-pdf/page/n3/mode/2up |pages=839–842|access-date=2021-10-29}} * {{cite book |last= Taylor |first= Michael J. H. |title=Jane's Encyclopedia of Aviation |year=1989 |publisher=Studio Editions |location=London |isbn= 0-7106-0710-5 }} *{{cite journal |last1=Warner|first1=Edward P.|title=Les avions de ligne au banc d'essai en 1921|journal=Le Fana de l'Aviation |date=May 2008 |issue=462 |pages=44–55 |issn=0757-4169 |language=fr|trans-title=Airlines on the Test Bench in 1921}}

[[Category:Potez aircraft|R09]] [[Category:1920s French airliners]] [[Category:Aircraft first flown in 1921]] [[Category:Single-engined tractor aircraft]] [[Category:Biplanes]]