{{Short description|1920s German sports aircraft}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{Infobox aircraft | name = V 40 | logo = | logo_size = | image = LFG V 40.png | alt = | caption = | long_caption = | other_names = | aircraft_type = Two-seat sports aircraft | aim = | outcome = | related = | national_origin = Germany | manufacturer = LFG (Luft-Fahrzeug-Gesellschaft) | design_group = | designer = | builder = | issuer = | status = | owners = | primary_user = | more_users = | service = | major_applications = | proposals = | prototypes = | number_built = 2 (V 40, V 44) | construction_number = | civil_registration = | military_serial = | radio_code = | requirement = | aircraft_carried = | flights = | total_hours = | total_distance = | construction_date = | introduction = | retired = | first_flight = 1925 | initiated = | in_service = | last_flight = | expected = | developed_from = | variants = | developed_into = | preservation = | fate = | predecessors = | successors = | concluded = }}

The '''LFG V 40''' and '''V 44''' were one-off, single-engine, two-seat sports monoplanes, identical apart from their engines, built in Germany in 1925.

==Design and development== The V 40 and V 44 were all-metal high-wing monoplanes, with thick, straight-edged, cantilever wings. Highly stressed members were steel, with duralumin elsewhere including the skin. The fuselages were deep-bellied and flat-sided with tandem open cockpits over the wing. On both aircraft, the pilot sat near the quarter chord position, with a slot in the fuselage below the wing to enhance his downward view, and the passenger was placed within a cut-out in the trailing edge. The tailplane was on top of the fuselage and the rounded vertical tail included a balanced rudder which extended down to the keel. The conventional undercarriage was fixed, with mainwheels on a single axle mounted on short V-struts and assisted by a tailskid.<ref name=Flight1/>

The V 40 and V 44 airframes were identical, but the V 40 was powered by a {{convert|75|hp|kW|abbr=on|0}} Siemens-Halske Sh 11 7-cylinder radial and the V 44 by a {{convert|100|hp|kW|abbr=on|0}} Bristol Lucifer 3-cylinder radial. Both were nose-mounted, uncowled, and drove two-blade propellers. External dimensions, apart from the exact length, were the same, and the weights were also similar.<ref name=Flight1/>

==Operational history== The V 40 and V 44 were amongst five LFG entries to the Round Germany Flight held in the summer of 1925, though only the LFG V 39 took take part.<ref name=Flight1/><ref name=Flight2/> thumb|right|V 44

==Variants== thumb|right|V 44 ; V 40: {{convert|75|hp|kW|abbr=on|0}} Siemens-Halske Sh 11 7-cylinder radial engine. One built. ; V 44: {{convert|100|hp|kW|abbr=on|0}} Bristol Lucifer 3-cylinder radial engine. One built.

==Specifications== {{Aircraft specs |ref=Flight 28 May 1925 p.323-4<ref name=Flight1/> |prime units?=met <!-- General characteristics --> |genhide=

|crew=One |capacity=One passenger |length m= |length note= |span m=11.4 |span note= |upper span m= |upper span ft= |upper span in= |upper span note= |lower span m= |lower span ft= |lower span in= |lower span note= |height m= |height ft= |height in= |height note= |wing area sqm=18 |wing area sqft= |wing area note= |aspect ratio=<!-- give where relevant eg sailplanes --> |airfoil= |empty weight kg= |empty weight note= |gross weight kg=829 |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |fuel capacity= |more general= <!-- Powerplant --> |eng1 number=1 |eng1 name=Siemens-Halske Sh 11 |eng1 type=7-cylinder radial |eng1 hp=75 |eng1 note= |power original= |more power=

|prop blade number=2 |prop name=<ref name=Flight2/> |prop dia m=<!-- propeller aircraft --> |prop dia ft=<!-- propeller aircraft --> |prop dia in=<!-- propeller aircraft --> |prop dia note= <!-- Performance --> |perfhide=

|max speed kmh=150 |max speed note= |cruise speed kmh= |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= |range miles= |range nmi= |range note= |endurance=<!-- if range unknown --> |ceiling m= |ceiling note= |g limits=<!-- aerobatic --> |roll rate=<!-- aerobatic --> |glide ratio=<!-- sailplanes --> |climb rate ms= |climb rate ftmin= |climb rate note= |time to altitude= |wing loading kg/m2= |wing loading lb/sqft= |wing loading note= |power/mass=

|more performance= *'''Landing speed:''' 75 km/h (46 mph) }}

<!-- ==See also== --> {{aircontent <!-- include as many lines are appropriate. additional lines/entries with carriage return. --> |see also= |related=<!-- related developments --> |similar aircraft=<!-- similar or comparable aircraft --> |lists=<!-- related lists --> }} <!--==Notes==-->

==References== {{Commons category|LFG V 40}} <references>

<ref name=Flight1>{{cite magazine|date=28 May 1925 |title=The round-Germany flight|magazine=Flight|volume=XVII|issue=22|pages=323–4|url=http://www.flightglobal.com/pdfarchive/view/1925/1925%20-%200323.html}}</ref>

<ref name=Flight2>{{cite magazine|date=4 June 1925 |title=Some impressions of the round-Germany flight.|magazine=Flight|volume=XVII|issue=23|page=343|url=http://www.flightglobal.com/pdfarchive/view/1925/1925%20-%200343.html}}</ref>

</references> <!-- ==Further reading== --> <!-- ==External links== --> <!-- Navboxes go here --> {{LFG aircraft}}

Category:1920s German sport aircraft LFG V 40 Category:High-wing aircraft Category:Single-engined tractor aircraft Category:Aircraft first flown in 1925