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Letov LF-107 Luňák

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  • Letov LF-107 Luňák

    Information
    The LF-107 Luňák (English: Kite) is a Czech aerobatic glider designed by Rudý Letov in the late 1940s. The design was developed within a prolific group of aeronautical engineers and sailplane pilots including K. Dlouhý, J. Matejcekm, and B. Bocek.

    Design and development
    The first flight of the prototype took place on June 25, 1948 and a second prototype flew in July. The prototype participated later in the same year in an aerobatic competition in Grenchen, Switzerland, and in Ziar[disambiguation needed], Poland in 1949, where its good aerobatic and gliding characteristics drew considerable attention.

    Unfortunately the serial production was disrupted by geopolitical developments, as the factory was charged with production of MiG-15, MiG-19 and MiG-21F aircraft and the access to Western civil export markets was progressively hampered by the emergence of the Iron Curtain. Therefore, only 75 examples of the Luňák were produced in all.

    In 1950, a variant with simpler construction and a revised cockpit, among other changes, was developed. This LF-107 Luňák of wooden construction, designated Letov VT-7 under the military training system, was instrumental in the development of gliding and aerobatics in the Czech Republic. The LF-107 was also used for aerobatic training in the Soviet Union, Bulgaria, Romania and Poland.

    XLF-207 Laminar
    The Letov XLF-207 Laminar, a derivative of the Luňák, holds the distinction of being the first glider in the world to have a laminar flow wing.[citation needed] Its maiden flight took place in Praha Letnany in August 1951. Research into laminar flow wings was carried out by the XLF-207 Laminar, a LF-107 fitted with laminar flow wings. Presently there are only nine airworthy Luňák, of which two are in the United Kingdom. A Luňák is displayed in the American Museum of Flight.

    Variants
    LF-107 Luňák
    The initial production version of this aerobatic glider, 75 built.
    VT-7
    Simpler construction with a revised cockpit for use by the Czech military.
    XLF-207 Laminar
    The Letov XLF-207 Laminar holds the distinction of being the first glider in the world to sport a laminar flow wing. Its maiden flight took place in

    Specifications (LF-107 Luňák)

    General characteristics
    Crew: 1
    Length: 6.78 m ( ft in)
    Wingspan: 14.27 m ( ft in)
    Wing area: 13.38 m2 ( ft2)
    Aspect ratio: 15.22
    Empty weight: 205 kg ( lb)
    Gross weight: 310 kg ( lb)

    Performance
    Maximum speed: 300 km/h ( mph)
    Maximum glide ratio: 24 at 80 km/h (43kts)
    Rate of sink: at 65 km/h 0.85 m/s (at 35kts 167 ft/min)

    Link https://en.wikipedia.org/wiki/Letov_LF-107_Luňák

    Lunak LF-107 (http://www.lunak.de/)

    Available Kits, RC Plans
    3,6 meter (1:3.7 scale)
    Wing Span: 3.6 m (143")
    Wing Airfoil: HQ 1.5/12
    Flying Weight: 4.5 kg (159 oz)
    Radio: Standard radio
    Mini servos for the wings
    http://www.icare-rc.com/lunak_3_6m.htm
    http://www.soaringusa.com/4.0M-LUA-AK-LF-107.html
    ————
    4,0 meter - Richard Modelsport CZ
    Wingspan: 4000 mm
    Length: 1840 mm
    Weight: 4200 g
    Area: 124,8 dm2
    Airfoil: E 211
    http://www.reichard.cz/en/models/gliders/lunak/
    ————
    4,4 meter (1:3,25 scale) Lunak LF 107
    Plans http://shop.vth.de/lunak-lf-107.html
    ————
    4,4 meter XLF-207 Laminar
    Weight: 13.5-14.5 lbs
    Airfoil: HQ 3-13/HQ 3-10
    Wing Area: 1510 sq.in.
    Wing Loading: 20.5-22 oz/sq.ft.
    EspritModel.com (RC Sport Flyer review, PDF 9.1mb)
    http://file.espritmodel.com/document...ew-laminar.pdf
    http://www.espritmodel.com/xlf-207-laminar-arf.aspx
    ————
    4,75 meter (1:3 scale)
    Scale: 1:3
    Length: 2.26m
    Wing Span: 4.75 m (187")
    Wing Area: 143 dm2 (2216 sq.in.)
    Wing Airfoil: RG 12 10%
    Wing Loading: 83g/dm2 (27oz/sq.ft.)
    Flying Weight: 12-15 kg (26 lbs)
    Radio: Standard radio
    Mini servos for the wings
    http://www.icare-rc.com/lunak_4_7m.htm
    ————
    6,0 m Black Horse Models
    LF-107 LUNAK
    Item code: BH145
    SPECIFICATION:
    Wingspan: 6,000mm (236.22in)
    Length: 2,800mm (110.24in)
    Weight: 18.5 kg (40.7 lbs.)
    Radio: 7 – 8 channels
    Servo: 9 – 10 standard high torque servos
    Electric Motor: BOOST 180 BL MOTOR
    Battery: 12S LIPO 44,4V 6,000mAh.HV
    Speed control: 120A
    Including Aluminum bubble wing bag and fuselage bag, elevator-rudder bag and glider cart.
    ALL BALSA – PLY WOOD CONSTRUCTION, COVERED WITH ORACOVER
    https://www.youtube.com/watch?v=-unuDQw97xc
    https://www.youtube.com/watch?v=40o0RYBomYQ

    Scale Documentation, Original Plans
    ​(coming…)


    Photographs

    Link http://www.lunak.de/Erstflug/images/prevs/prev33.jpg



    Link https://commons.wikimedia.org/wiki/F...122322251).jpg


    Link https://commons.wikimedia.org/wiki/F...te_resting.jpg



    Link https://commons.wikimedia.org/wiki/F...Old_Warden.jpg
    Klassische Segelflugzeuge

  • #2
    Cool 1/2 scale....

    Klassische Segelflugzeuge

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