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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
————
4,0 meter - Richard Modelsport CZ
Wingspan: 4000 mm
Length: 1840 mm
Weight: 4200 g
Area: 124,8 dm2
Airfoil: E 211
————
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
————
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
————
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
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
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
————
4,0 meter - Richard Modelsport CZ
Wingspan: 4000 mm
Length: 1840 mm
Weight: 4200 g
Area: 124,8 dm2
Airfoil: E 211
————
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
————
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
————
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
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
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