<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{infobox aero engine |name= Delta |image = Gnome Delta - Moteurs Gnome October 1913.png |caption = Gnome 9 Delta as shown in a 1913 Gnome catalog |engine_type= Rotary aero engine |national_origin = |manufacturer= Société des Moteurs Gnome |first_run= {{circa|1909}} |major_applications=Avro 500<br>Vickers F.B.9 Gunbus |number_built = |developed_from = |developed_into = |variants_with_their_own_articles = Oberursel U.I }}

The '''Gnome 9 Delta''' was a French designed, nine-cylinder, air-cooled rotary aero engine that was produced under license in Britain. Powering several World War I era aircraft types it produced {{cvt|100|hp}} from its capacity of {{convert|16|L|cuin}}.<ref name="Lumsden">{{cite book|last1=Lumsden|first1=Alec S.C.|title=British piston aero-engines and their aircraft|date=1994|publisher=Airlife Publ.|location=Shrewsbury|isbn=1-85310-294-6|page=152|edition=1. publ. in the UK.}}</ref>

==Variants== ;Delta:The baseline 9-cylinder {{cvt|100|hp}} rotary engine. ;Delta-Delta:An 18-cylinder {{cvt|200|hp}} two-row rotary engine - Two Deltas on a common crankshaft.

==Applications== ''List from Lumsden''

*Avro Type 500 *Caudron Type L<ref name=Hauet>{{cite book |title=Les Avions Caudrons |last=Hauet|first=André|year=2001|volume=1|publisher=Lela Presse|location=Outreau|isbn=2 914017-08-1|page=55}}</ref> *Dreadnought No.1<ref>{{Cite web | title=Dreadnought 1 | url=http://www.century-of-flight.freeola.com/Aviation%20history/up%20to%20WW%201/dreadnought_1.htm | access-date=2026-03-28 | website=www.century-of-flight.freeola.com}}</ref> *Pemberton-Billing P.B.25 *Royal Aircraft Factory S.E.2 *Vickers No.7 Monoplane *Vickers F.B.9 Gunbus

==Engines on display== *A preserved Gnome 9 Delta engine is on public display at the Musée des Arts et Métiers, Paris

==Specifications (9 Delta)== thumb|Gnome 18 Delta-Delta from the 1913 Gnome catalog {{pistonspecs| <!-- If you do not understand how to use this template, please ask at Wikipedia talk:WikiProject Aircraft --> <!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with )</li> and start a new, fully-formatted line with <li> --> |ref=''Lumsden''.<ref name="Lumsden"/><ref name=gnomedelta>{{cite book|title=Moteurs Gnome|date=October 1913|publisher=Société des Moteurs Gnome|location=Paris|pages=15–18|url=https://www.museesafran.com/sites/musee/files/journaux/15-livres_espace_patrimoine_moteurs%20gnome_octobre_1913.pdf|accessdate=26 June 2018|language=French|format=PDF}}</ref><ref name="Angle">{{cite book |last1=Angle |first1=Glenn D. |title=Airplane Engine Encyclopedia |url=https://archive.org/details/airplaneenginee00anglgoog |date=1921|publisher=THE OTTERBEIN PRESS|location=Dayton, Ohio|page=[https://archive.org/details/airplaneenginee00anglgoog/page/n221 212]}}</ref> |type=9-cylinder, single-row, rotary engine |bore={{convert|124|mm|in|abbr=on|2}} |stroke={{convert|150|mm|in|abbr=on|2}} |displacement={{convert|16.28|L|cuin|abbr=on|2}} |length={{convert|1150|mm|in|abbr=on|2}} |diameter={{convert|1020|mm|in|abbr=on|2}} |width= |height= |weight= {{convert|135|kg|lb|abbr=on|1}} |valvetrain=Automatic centre-piston inlet valve, one overhead exhaust valve per cylinder. |supercharger= |turbocharger= |fuelsystem=one static Bloctube carburettor feeding the crankcase |fueltype=40 / 50 Octane gasoline |oilsystem=Total loss pressure fed |coolingsystem=Air-cooled |power=75 kW (100 hp) at 1,200 rpm |specpower= |compression= |fuelcon= |specfuelcon=362 g/(kW·h) (0.6 lb/(hp·h)) |oilcon= |power/weight= |reduction_gear= }}

==See also== {{aircontent <!-- other related articles that have not already linked: --> |see also=

<!-- designs which were developed into or from this aircraft: --> |related=

<!-- aircraft that are of similar role, era, and capability this design: --> |similar aircraft=

<!-- relevant lists that this aircraft appears in: --> |lists= *List of aircraft engines

<!-- For aircraft engine articles. Engines that are of similar to this design: --> |similar engines= *Bentley BR1 *Clerget *Le Rhône 9C <!-- See WP:Air/PC for more explanation of these fields. --> }}

==References== {{reflist}}

==External links== {{Commons category multi|Gnome Delta|Gnome Delta-Delta}}

{{Gnome-Rhône aeroengines}}

Category:Air-cooled aircraft piston engines Category:1900s aircraft piston engines Delta Category:Rotary aircraft piston engines Category:Nine-cylinder engines