Akaflieg Berlin B13

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Akaflieg Berlin B13
Akafliegberlinb13.jpg
Role High Performance Two-Seat Glider (with sustainer)[1]
National origin Germany
Manufacturer Akaflieg Berlin
First flight 1991
Primary user Akaflieg Berlin
Number built 1

The Akaflieg Berlin B13 is a two-seat motor-glider designed and built in Germany.[1]

Development[]

Students at Akaflieg Berlin studied a high-performance motor-glider with the engine in the nose and an automatically folding propeller. After approval was given, a prototype was built in 1991, as the ' Akaflieg Berlin B13', using GFRP (glass-fibre re-inforced plastic) to form a fuselage with smooth lines, housing the engine in the nose and a two-seat side-by-side cockpit covered by a large plexiglas canopy.[1]

Intended to use a sustainer motor, for sustaining flight only, power was to be supplied by a modified 24.5KW (33 hp) engine in the extreme nose driving a 5-blade folding retractable propeller, specially developed by . However, problems with the integration of the engine with the fuselage have prevented the fitting of the engine, resulting in the 'B13' being restricted to un-powered flight only.[1]

Specifications (B13 power off)[]

Data from Jane's All the World's Aircraft 1988-89,[2] sailplanedirectory.com[3]

General characteristics

  • Crew: 2
  • Length: 8.3 m (27 ft 3 in)
  • Wingspan: 23.2 m (76 ft 1 in)
  • Height: 1.9 m (6 ft 3 in)
  • Wing area: 18.9 m2 (203 sq ft)
  • Aspect ratio: 28.5
  • Airfoil: HQ 41/ 14,35
  • Empty weight: 590 kg (1,301 lb)
  • Max takeoff weight: 850 kg (1,874 lb)
  • Fuel capacity: 25 l (6.6 US gal; 5.5 imp gal)
  • Water Ballast: 160 l (42 US gal; 35 imp gal)
  • Powerplant: 1 × Rotax 377 2-cyl. horizontally-opposed air-cooled piston engine, 24 kW (32 hp)
  • Propellers: 5-bladed Oehler folding propeller

Performance

  • Stall speed: 70 km/h (43 mph, 38 kn)
  • Never exceed speed: 280 km/h (170 mph, 150 kn) in smooth air
    200 km/h (110 kn; 120 mph) in rough air
    75 km/h (40 kn; 47 mph) on aero-tow
    120 km/h (65 kn; 75 mph) on winch launch
  • g limits: +5.3 - 2.65
  • Maximum glide ratio: 49 at 105 km/h (57 kn; 65 mph)
  • Rate of sink: 0.55 m/s (108 ft/min) at 75 km/h (40 kn; 47 mph)
  • Wing loading: 42.2 kg/m2 (8.6 lb/sq ft) at max t/o weight
  • Power/mass: 0.0376 kW/kg (0.0229 hp/lb)

See also[]

Aircraft of comparable role, configuration, and era

References[]

  1. ^ a b c d http://akaflieg.extern.tu-berlin.de/joomla/index2.php?option=com_content&do_pdf=1&id=25[permanent dead link]
  2. ^ John W.R. Taylor, ed. (1988). Jane's All the World's Aircraft 1988-89. London: Jane's Information Group. ISBN 0-7106-0867-5.
  3. ^ "B-13 Akaflieg Berlin". sailplanedirectory.com. Archived from the original on 2016-03-03. Retrieved 19 January 2015.

External links[]

  • [1] Akaflieg Berlin B13
  • [2][permanent dead link] Akaflieg Berlin
  • [3] Sailplane Directory
  • [4] Akaflieg Berlin
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