Akaflieg Braunschweig SB 5

Akaflieg Braunschweig SB 5
	; SB 5B, 1987
Type:	Glider
Design country:	Germany
Manufacturer:	Akaflieg Braunschweig
First flight:	June 3, 1959 ; (SB 5C: April 30, 1965)
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

Fuselage of an SB 5 of the B series

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

literature

Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 .

Web links

Commons : Akaflieg Braunschweig SB-5 Danzig - Collection of images, videos and audio files

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 .

[SB_S263-1] Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 263 .

[SB_S028-2] Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 28 .

[SB_S031-3] Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 31 .

[SB_S259-4] Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 259 .

[5] Operating Manual SB 5E of March 24, 1979, page 23f. on vtail.de . 2016.

[AkaSB5-6] SB 5 - Technical data. In: akaflieg-braunschweig.de. Akaflieg Braunschweig, accessed on May 26, 2016 .

[7] SB 5e V2 ( Memento from December 30, 2016 in the Internet Archive ). Website of the German Glider Museum. Retrieved December 30, 2016.

[SB_S42-8] Academic Fliegergruppe Braunschweig (Ed.): SB 5 - SB 15 . Braunschweig glider. Appelhans-Verlag, Braunschweig 2012, ISBN 978-3-941737-73-0 , p. 42 .