Akaflieg Braunschweig SB 5
Akaflieg Braunschweig SB 5 | |
---|---|
SB 5B, 1987 |
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Type: | Glider |
Design country: | |
Manufacturer: | |
First flight: |
June 3, 1959 |
Production time: |
1961-1969 |
Number of pieces: |
Version SB 5B: 40-50 |
The Akaflieg Braunschweig SB 5 is a single-seat glider of the Academic Fliegergruppe Braunschweig with a V-tail.
history
Preliminary considerations for the "Glider Braunschweig" SB 5 arose directly after the re-establishment of Akaflieg Braunschweig in 1951. Designed for Central European weather and flight operations in clubs, the first draft was a 16-meter-span shoulder-wing wing with tubular steel framework and cross tail . A 1:20 model was measured in a wind tunnel in 1954.
After the introduction of an international standard glider class with a span limitation of 15 meters by the OSTIV in 1957, the aircraft design was revised. The SB 5 V1 flew for the first time on June 3, 1959 and was lost on June 6, 1961 due to structural overload in a thundercloud ; the pilot was able to save himself.
The modified version SB 5B had Schempp-Hirth brake flaps and an improved canopy instead of a braking parachute . About 20 to 25 copies of this version were made by the club and by Eichelsdörfer .
After the lifting of the span limitation in the new FAI club class, the SB 5E was built with a span of 16 meters.
In 1965, Akaflieg Braunschweig built the SB 5C as a single piece with a GFK - balsa front part, which corresponded to the cockpit of the SB 8, which is currently under development. This unique piece was manufactured as an aeronautical replacement for the SB 6 that was lost in an accident and the new cockpit was tested in the process.
construction
The fuselage consists of a plywood shell with a damped V-tail unit, brakable main wheel and grinding spur. The SB 5A has no brake flaps and instead a brake parachute is installed at the rear. The two-part wing in a shoulder wing arrangement is conventionally manufactured in a rib construction.
Technical specifications
Parameter | SB 5A | SB 5B / 5C | SB 5E |
---|---|---|---|
span | 15 m | 16.1 m | |
Wing area | 13 m² | ||
Wing extension | 17.3 | ||
V shape | 0.5 ° | ||
Arrow | 0 ° | ||
Hull length | 6.65 m | 6.5 m | 6.57 m |
Empty mass | 203 kg | 225 kg | 250 kg |
Max. Takeoff mass | 300 kg | 325 kg | |
Wing loading | 23.1 kg / m² | 25 kg / m² | |
Top speed | 200 km / h | ||
Maneuver speed | 140 km / h | ||
Glide ratio | 28.5 at 80 km / h | 32.5 at 77 km / h | 34.5 at 87 km / h |
min. Rate of descent | 0.72 m / s at 70 km / h | 0.63 m / s at 66 km / h | 0.65 m / s at 75 km / h |
Preserved copies
- SB 5E V2: (SB 5B, last registration number D-6300) in the German Glider Museum
- SB 5B: still around 40 flying copies
- SB 5C: (last registration number D-6299) major overhaul completed, since 2011 “movable [technical] cultural monument” of the state of Lower Saxony
- SB 5E: still a few flying copies
See also
literature
Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 .
Web links
- SB 5 on akaflieg-braunschweig.de
- Flight and operating manual series B and E, edition 1979 (PDF; 3.4 MB, accessed on October 27, 2016)
- SB 5A in the J2mcL Planeurs glider database
- SB 5C in the J2mcL Planeurs glider database
Individual evidence
- ↑ Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 263 .
- ↑ Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 28 .
- ↑ a b Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 31 .
- ↑ a b Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 259 .
- ↑ Operating Manual SB 5E of March 24, 1979, page 23f. on vtail.de . 2016.
- ↑ a b SB 5 - Technical data. In: akaflieg-braunschweig.de. Akaflieg Braunschweig, accessed on May 26, 2016 .
- ↑ SB 5e V2 ( Memento from December 30, 2016 in the Internet Archive ). Website of the German Glider Museum. Retrieved December 30, 2016.
- ↑ Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 42 .