Heinkel Greif

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Heinkel Greif
Griffin II
The further development Greif II built at Basten
Type: Glider
Design country:

Germany Federal RepublicFederal Republic of Germany BR Germany

Manufacturer:

Heinkel Flugzeugwerke

First flight:

December 24, 1960 (Greif Ia / FK-1, D-7142)

Number of pieces:

1 (Greif Ia)

The Heinkel Greif is a standard class glider from the German manufacturer Ernst Heinkel Flugzeugbau GmbH . The designer of the all-metal aircraft was Otto Funk , co-founder of today's ultra-light aircraft manufacturer FK Leichtflugzeuge Germany (B&F Technik Vertriebs GmbH). The aircraft is therefore also referred to as FK 1 .

In addition to the Greif Ia glider version, there was also the Greif Ib motor glider variant, which, however, never flew.

history

Otto Funk carried out the design work for the Greif Ia in 1959 under the direction of Hans Hollfelder as a student trainee at Heinkel in Speyer. The first flight took place on December 24, 1960 . The Greif Ia with the registration number D-7142, which was presented to the public at the Hanover Air Show in 1962, had a winch launch accident in 1963.

The variant grip Ib was similar to the H-30 Hütter HS with a BMW 8026 - jet engine equipped for self-launch, but never flew. The engine was rigidly installed behind the pilot's seat, the jet outlet was inclined slightly downwards.

construction

In order to be able to meet such extensive requirements as a surface quality that is insensitive to temperature and weathering as well as the exclusion of material fatigue - combined with a low purchase price - Otto Funk saw a possibility of implementation , especially in the all-metal construction . In order to keep the weight low, the less stressed elements were made of plastic.

The single-spar wing has a trapezoidal outline without any twist . The main connection ribs are made of light metal, all other ribs are made of Styrofoam . The fittings are made of steel. The wings are clad with 0.5 mm thick clad light metal. The ailerons and Schempp-Hirth brake flaps are also made of light metal.

What is striking is the low hull, which consists of a hull boat and a relatively thin tail girder formed by a light metal tube. The inner structure of the boat is a tubular steel frame that is covered with a non-load-bearing plastic skin. Damage to the outer skin therefore has no effect on the structural strength.

The two halves of the V-tail are interchangeable. The chassis forms a brakable and sprung balloon wheel. There is no runner, the spur is a leaf spring. It is worth mentioning the high breaking load multiple of 10.

Technical specifications

Parameter Greif Ia (FK-1, D-7142)
crew 1
length 7.20 m
span 15 m
Wing area 13.70 m²
Wing extension 16.42
Glide ratio 32.6 at 85 km / h
Slightest sinking 0.70 m / s at 75 km / h
payload 110 kg
Empty mass 216 kg
Max. Takeoff mass 326 kg
Top speed 250 km / h
Engines 1 × jet engine BMW 8026 (Greif Ib)

See also

literature

  • Heinz Brock: Lightweights in Hanover. In: Flug-Revue, July 1962, p. 26f.

Individual evidence

  1. ↑ grip 1a (Fk1) 1959 / Otto Funk. In: fk-servicecenter.com. Retrieved September 1, 2017 .
  2. ↑ a b c Dietmar Geistmann: Gliders in Germany . 2nd Edition. Motorbuch Verlag, Stuttgart 1994, ISBN 3-613-01449-1 , p. 58-62 .