FVD Doris
| FVD Doris / Akaflieg Dresden D-B2 | |
|---|---|
| Type: | Glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
1922 |
| Number of pieces: |
1 |
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The FVD Doris (later Akaflieg Dresden D-B2 Doris ) was a single-seat glider of the Flugtechnischen Verein Dresden (FVD) with wing control.
history
After the standing pile developed in cooperation with the TH Dresden , a monoplane called Doris was created as the second own construction of the Flugtechnischen Verein . Designed as an experimental aircraft, the wing control system, previously tested by Erich Offermann from Aachen and successfully used by Friedrich Harth, was to be used with this. It was hoped that it would quickly react to changes in the flow field on slopes . After Akaflieg Dresden was founded, the glider was called the D-B2.
construction
Horst Muttray and Reinhold Seifert designed a shoulder -wing wing whose single-spar , four-part wing ( profile in the central area Gö 441, symmetrically stiffened towards the edge arch ) rested in the middle on a narrow fuselage edge and held against the fuselage by pairs of struts at about a third of the span in the area of the spar was. The top of the leading edge of the wing and the arch were plywood paneled , the rest of the fabric covered. Wing halves rotatable independently of one another around the transverse axis made it possible to change the angle of attack via bumpers and thus change the lift distribution on the wing. This enabled control around the longitudinal axis . When the control stick was moved sideways, the wing parts were set against the current to different degrees. When moving forwards or backwards ("pushing" and "pulling") the setting angles were changed to the same extent on both sides. The 60 cm wide wooden fuselage with a rectangular cross-section in half-timbered construction tapered towards the rear, was plywood-planked in the front part and covered with fabric from the trailing edge of the wing. Two rubber block-dampened ash runners and a spur at the rear formed the chassis. The damping surface of the 3.30 m wide horizontal stabilizer could be adjusted via a lever on the control stick, the 1 m high vertical stabilizer had a 65 cm deep rudder.
use
The plane drove to the 1922 Rhön competition on the Wasserkuppe. An acceptance by the Technical Commission was without any complaints. During the pre-flight, however, Muttray broke. The accident was attributed to the control system, which was unfamiliar to the pilot, so that the adjustment lever for the fin trim was relocated during the reconstruction, which was completed in November 1922. As a result, the aircraft flew on the club's airfield near Geising in the Ore Mountains .
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 |
| length | 5.30 m |
| span | 12.20 m |
| height | |
| Wing area | 15.5 m² |
| Wing extension | 9.6 |
| Empty mass | 118.5 kg |
| Flight mass | 195.0 kg |
| Wing loading | 12.6 kg / m² |
| Glide ratio | 14.6 |
See also
Web links
- Dresden D-B02 Doris. in the glider database J2mcL Planeurs
Individual evidence
- ^ A b c d Karlheinz Kens: Dresden D-B2 "Doris" . In: Historic German aircraft up to 1945 . 2nd Edition. tape 1 . Modellsport Verlag, Baden-Baden 2011, ISBN 978-3-923142-39-2 , p. 64-67 .