View source for Bréguet 790 Nautilus

{{Short description|French coastal patrol flying-boat, 1939}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox Aircraft Begin
| name=790 Nautilus
| image=
| caption=
}}{{Infobox Aircraft Type
| type=Coastal patrol [[flying-boat]]
| national origin=[[France]]
| manufacturer=[[Bréguet Aviation]]
| designer=
| first flight=1939
| introduced=
| retired=
| status=
| primary user=
| number built=2
| developed from=
| variants with their own articles=
}}
|}
The '''Bréguet 790 Nautilus''' was a prototype [[France|French]] three-seat coastal patrol [[flying-boat]] designed and built by [[Bréguet Aviation]] to meet a requirement from the French navy.<ref name="orbis" />
==Development==
The Nautilus had a high-set [[monoplane]] wing on a single-step hull, the wing being [[Aircraft fabric covering|fabric covered]] and the hull all-metal.<ref name="orbis" /> The aircraft was powered by a 720&nbsp;hp (537&nbsp;kW) [[Hispano-Suiza 12Xirs]] [[V12 engine|V-12]] piston engine strut-mounted above the hull, driving a pusher propeller.<ref name="orbis" />
The first of two prototypes flew in 1939 and performed well enough that a production order for 75 was placed.<ref name="orbis" /> The order was reduced to 45 in May 1940 in order to free production capacity for more urgently needed combat aircraft, but none were built following the German invasion.<ref name="orbis" /><ref name="Green v5 p14">Green 1968, p.14.</ref>
==Variants==
;Bréguet 790
:Basic three-seat coastal reconnaissance aircraft, powered by {{convert|720|hp|kW|abbr=on|order=flip}} [[Hispano-Suiza 12Xirs]] engine.  Two prototypes built.<ref name="Green v5 p13-4">Green 1968, pp. 13–14.</ref>
;Bréguet 791
:Proposed version powered by single {{convert|660|hp|kW|abbr=on|order=flip}} [[Gnome-Rhône 14M]] [[radial engine]]. Unbuilt.<ref name="Green v5 p14"/>
;Bréguet 792
:Proposed version for ship-based reconnaissance aircraft, powered by two {{convert|360|hp|kW|abbr=on|order=flip}} [[Béarn 6]] air-cooled inline engines. Unbuilt.<ref name="Green v5 p14"/>
==Specifications==
{{Aircraft specs
|ref=<ref name="orbis" />
|prime units?=met
<!--
General characteristics
-->
|genhide=
|crew=three
|capacity=
|length m=13.00
|length ft=
|length in=
|length note=
|span m=17.00
|span ft=
|span in=
|span note=
|upper span m=
|upper span ft=
|upper span in=
|upper span note=
|mid span m=
|mid span ft=
|mid span in=
|mid span note=
|lower span m=
|lower span ft=
|lower span in=
|lower span note=
|swept m=<!-- swing-wings -->
|swept ft=<!-- swing-wings -->
|swept in=<!-- swing-wings -->
|swept note=
|dia m=<!-- airships etc -->
|dia ft=<!-- airships etc -->
|dia in=<!-- airships etc -->
|dia note=
|width m=<!-- if applicable -->
|width ft=<!-- if applicable -->
|width in=<!-- if applicable -->
|width note=
|height m=4.00
|height ft=
|height in=
|height note=
|wing area sqm=33.00
|wing area sqft=
|wing area note=
|swept area sqm=<!-- swing-wings -->
|swept area sqft=<!-- swing-wings -->
|swept area note=
|volume m3=<!-- lighter-than-air -->
|volume ft3=<!-- lighter-than-air -->
|volume note=
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=2700
|empty weight lb=
|empty weight note=
|gross weight kg=
|gross weight lb=
|gross weight note=
|max takeoff weight kg=3600
|max takeoff weight lb=
|max takeoff weight note=
|lift kg=<!-- lighter-than-air -->
|lift lb=<!-- lighter-than-air -->
|lift note=
|more general=
<!--
Powerplant
-->
|eng1 number=1
|eng1 name=[[Hispano-Suiza 12Xirs]]
|eng1 type=inline piston engine
|eng1 kw=<!-- prop engines -->
|eng1 hp=<!-- prop engines -->720
|eng1 note=
|power original=
|thrust original=
|prop blade number=3<!-- propeller aircraft -->
|prop name=
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop note=
<!--
Performance
-->
|perfhide=
|max speed kmh=310
|max speed mph=
|max speed kts=
|max speed note=
|max speed mach=<!-- supersonic aircraft -->
|cruise speed kmh=150
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=<!-- aerobatic -->
|stall speed mph=<!-- aerobatic -->
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=900
|range miles=
|range nmi=
|range note=
|combat range km=
|combat range miles=
|combat range nmi=
|combat range note=
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=6 hr at {{convert|90|mph|km/h|-1||abbr=on}}<ref name="Green v5 p14"/>
|ceiling m=6000
|ceiling ft=
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=
|climb rate ftmin=1437
|climb rate note=<ref name="Green v5 p14"/>
|sink rate ms=<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|sink rate note=
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|disk loading kg/m2=
|disk loading lb/sqft=
|disk loading note=
|power/mass met=
|power/mass imp=
|power/mass note=
|thrust/weight=
|thrust/weight note=
|more performance=
<!--
Armament
-->
|guns= 1× 7.5 mm [[Darne machine gun]] in dorsal position<ref name="Green v5 p14"/>
|bombs= 2× {{convert|165|lb|kg|abbr=on|order=flip}} bombs underwing<ref name="Green v5 p14"/>
|rockets=
|missiles=
|hardpoints=
|hardpoint capacity=
|hardpoint rockets=
|hardpoint missiles=
|hardpoint bombs=
|hardpoint other=
|avionics=
}}
==See also==
{{Portal|Aviation}}
{{aircontent
<!-- include as many lines are appropriate. additional lines/entries with carriage return. -->
|see also=
|related=<!-- related developments -->
|similar aircraft=<!-- similar or comparable aircraft -->
|sequence=<!-- designation sequence, if appropriate -->
|lists=<!-- related lists -->
*[[List of flying boats and floatplanes]]
}}
==References==
;Notes
{{reflist|refs=
<ref name="orbis">Orbis 1985, p. 879</ref>
}}
;Bibliography
{{refbegin}}
*{{cite book|last=Green |first=William |title=War Planes of the Second World War: Volume Five Flying Boats |year= 1968|publisher= Macdonald|location= London|isbn=0-356-01449-5 }}
*{{cite book |title= The [[Illustrated Encyclopedia of Aircraft]] (Part Work 1982-1985)|publisher= Orbis Publishing}}
{{refend}}
<!-- ==External links== -->
{{Bréguet aircraft}}
[[Category:1930s French military reconnaissance aircraft]]
[[Category:Flying boats]]
[[Category:Breguet aircraft| 0790]]
[[Category:Single-engined pusher aircraft]]
[[Category:High-wing aircraft]]
[[Category:Aircraft first flown in 1939]]