Hannover Greif

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H.2 Greif
Role Competition glider
National origin Germany
Manufacturer Hannoversche Waggonfabrik (Hannover Coach and Carriage Works)
Designer Arthur Martens and Fritz Heinrich Hentzen, Akaflieg Hannover
First flight 1922
Number built 1
Developed from
Hannover Vampyr

The Akaflieg Hannover H.2 Greif (English: Griffon) was a 1922 development of the successful

) contests, it failed to match the achievements of its predecessor.

Design and development

The first Akaflieg Hannover glider was the Vampyr

high, thick wing, short fuselage configuration and retaining its tail, though both wing and fuselage were new.[2]

The Greif's wing was a

ailerons initially fitted to the Vampyr.[1][2]

The Vampyr had a fuselage with a simple rectangular cross-section but that of the Greif was more refined, with an elliptical section, though both were rather similar in profile. Both fuselages were completely ply skinned over wooden

stringers. The Greif's wing was mounted closer to the fuselage than on its predecessor, with the consequence that a cut-out had to be made in the leading edge for the pilot's head. This turned out to have deleterious aerodynamic effects. Its undercarriage consisted of a pair of semi-recessed wheels with balloon tyres on the centreline, one under the nose and the other larger one under the wing spar. The tail surfaces of the Greif were very similar to those of the Vampyr; a rectangular all-moving tailplane was hinged at the extreme rear of the fuselage with the rudder hinged at the same point. The fin was broad as required by the short fuselage; fin and rudder had straight vertical edges and a straight, rising top. The bottom of the rudder was parallel with its top, leaving room the tailplane movement.[2]

Operational history

Both the Vampire and the Greif flew at the 3rd

induced drag; the losses were much greater than those caused by similar sized trailing edge cut-outs on other designs, as the pressure differences between upper and lower surfaces and the strength of the associated lossy vortexes are smaller there.[2][3]

Nevertheless, the Greif competed at the next two Rhöns,

elevator configuration. Its last flight, at the Zugspitze competition in January 1925, ended with a collision into a wooden fence on landing in Garmisch-Partenkirchen that destroyed the Greif.[2][5]

Specifications

At the 1922 Rhön competition

Data from Historische Deutsche Flugzeug bis 1945 [2]

General characteristics

  • Crew: One
  • Length: 5.32 m (17 ft 5 in)
  • Wingspan: 11.60 m (38 ft 1 in)
  • Height: 1.85 m (6 ft 1 in)
  • Wing area: 16.0 m2 (172 sq ft)
  • Aspect ratio: 8.4
  • Empty weight: 80 kg (176 lb)
  • Gross weight: 176 kg (388 lb)
  • Wing loading: 11 kg/m2 (2.3 lb/sq ft)

Performance

  • Maximum glide ratio: 16:1
  • Rate of sink: 0.8 m/s (160 ft/min) minimum

See also

Related lists

References

  1. ^ .
  2. ^ .
  3. ^ "German gliders". Flight. Vol. XIV, no. 36. 31 August 1922. p. 546.
  4. ^ "The Rhön machines". Flight. Vol. XVI, no. 35. 28 August 1924. p. 542.
  5. ^ "Light plane and glider notes". Flight. Vol. XVII, no. 8. 19 February 1925. p. 98.