- Design and development
- Specifications
- Notes
- References
| name=L.71 | image=Albatros L.71b.png | caption= }}{{Infobox Aircraft Type | type=Two seat light biplane | national origin=Germany | manufacturer=Albatros Flugzeugwerke | designer= | first flight=1925 | introduced= | retired= | status= | primary user= | more users= | produced= | number built=2 | program cost= | unit cost= | developed from= | variants with their own articles=
}} |
The Albatros L.71 was a two seat, single pusher engined biplane built in Germany in the 1920s. Design and developmentFlight described the L.71[ as a flying boat on wheels because, in the 1920s, such aircraft were almost the only modern pusher biplanes. Visually, the most unusual feature was the extreme stagger, introduced to optimise the view for each of the occupants of its tandem cockpits. Both wings had spruce spars, continuous from tip to tip, and spruce ribs. The larger upper wing had no dihedral but carried the ailerons; the lower wing had 1.5° of dihedral. Outward leaning, aluminium tube N-form interplane struts braced the wings but there was none of the usual flying wire bracing in the single bay; the wings were aerodynamically quite thick, allowing them to be internally braced cantilevers. The upper wing centre section was supported by a shorter pair of outward leaning N struts from the upper fuselage. Though the lower plane was set at mid-fuselage the interplane gap was large, to provide clearance for the two blade propeller.[2]] The pusher configuration {{convert|55|hp|kW|abbr=on|0}} Siemens-Halske Sh 10[3] five cylinder radial was aerodynamically faired into the upper wing trailing edge but was not structurally connected to it; instead, four tubes from the fuselage formed the engine mounting. The fuel tank was within the forward section of the upper wing, feeding the engine by gravity with some pressure assistance. The fuselage was of mixed construction. From the nose to the lower wing leading edge, a region which included the two cockpits, it was a flat sided wooden structure, covered in plywood; aft, it was built from wire braced, welded steel tubes and fabric covering. This section included the lower wing mounting. The tail surfaces were fabric covered, over mixed steel and duraluminum frames. The incidence of the tailplane could be adjusted for pitch trimming. The L.71 had a simple, fixed conventional undercarriage with short axles hinged to the lower fuselage longerons and forward braced with short horizontal struts. Sprung, telescopic legs with rubber shock absorbers were attached to the outer end of the axles and to the upper fuselage longerons.[2] The L.71 was flight testing by late January 1926.[2] Two were built.[3] Specifications{{Aircraft specs
|ref=Flight, 28 January 1926[2]
|prime units?=met
|genhide=
|capacity=Two
|length m=7.20
|length note=
|upper span m=10.30
|upper span note=
|lower span ft=24
|lower span in=7
|lower span note=
|height m=
|height ft=
|height in=
|height note=
|wing area sqft=270
|wing area note=
|aspect ratio=
|airfoil=
|empty weight kg=450
|empty weight note=
|gross weight kg=660
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=50 L (11 Imp gal, 13.2 US gal)
|more general=
|eng1 number=1
|eng1 name=Siemens-Halske Sh 10
|eng1 type=5-cylinder radial, in pusher configuration
|eng1 hp=55
|eng1 note= (engine type number from[3])
|more power=
|prop blade number=2
|prop name=
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=
|perfhide=
|max speed kmh=125
|max speed note= at sea level
|cruise speed kmh=
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|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=
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|minimum control speed kts=
|minimum control speed note=
|range km=
|range miles=
|range nmi=
|range note=
|endurance=
|ceiling m=
|ceiling ft=
|ceiling note=
|g limits=
|roll rate=
|glide ratio=
|climb rate ftmin=
|climb rate note=
|time to altitude=12 min to 1,000 m (3,280 ft)
|wing loading lb/sqft=5.38
|wing loading note=
|power/mass=0.038 hp/lb (62 W/kg)
|more performance=
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Notes1. ^1 2 3 4 {{cite magazine |last= |first= |authorlink= |date=28 January 1926 |title= A Flying Boat on Wheels|magazine= Flight|volume=XVIII |issue=4 |pages=43–44 |id= |url= http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200043.html }}
2. ^1 2 3 {{cite web |url=http://www.histaviation.com/Albatros_L_71.html|title=Albatros L.71 |author= |date= |work= |publisher= |accessdate=9 August 2013}}
References{{Commons category|Albatros L.71}}{{reflist|refs=[1][2]
}}{{albatros aircraft}} 5 : German sport aircraft 1920–1929|Biplanes|Single-engined pusher aircraft|Aircraft first flown in 1925|Albatros aircraft |