FVD standing bunch
| FVD Stehaufchen / Akaflieg Dresden D-B1 | |
|---|---|
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| Type: | Glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
August 23, 1921 |
| Number of pieces: |
1 |
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The FVD Stehaufchen (also Dresden Stehaufchen later Akaflieg Dresden D-B1 ) was a single-seat biplane - glider of flight Technical Association Dresden (FVD) . It participated with some success in the Rhön competitions in 1921 and 1922 and was used for flight training.
history
Even before the Academic Aviation Group Dresden (Akaflieg) was formally founded around 1924, there was a cooperation between the TH Dresden , the local sports airfield and the FVD. On February 11, 1921, the Flugtechnischer Verein decided to take part in the 2nd Rhön competition on the Wasserkuppe with its own aircraft design. At the Technical University, after consultation with Professor Pöppl, workrooms and a workshop could be set up. In return, the FVD later allowed the establishment of Akaflieg Dresden as its sub-group.
The students of the TH, Horst Muttray, Reinhold Seifert and Rudolf Spies designed the glider known as the stand -up glider for the competition and for subsequent use for scientific research and as a training aircraft . The double-decker configuration was chosen for reasons of strength and for rail transport, which allowed the maximum dimension of the cargo to be 4.20 m. Construction began on June 11, 1921; the first flight took place about ten weeks later on August 23 on the Wasserkuppe . After Akaflieg Dresden was founded, the glider was named as the first in-house design of the D-B1 association .
construction
The bunch was a single-seater biplane with two spars 70 cm apart and 1.2 ° swept wings of different wingspan . The wings, which were arranged slightly one above the other, were 1.50 m apart, which was unusually large to make boarding easier for the pilot. The 1.20 m deep lower wing with a 1.5 ° V position was mounted on the hull boat, the 1.45 m deep upper wing was supported by three V-shaped strut pairs towards the hull. Parallel, due to the different wing spans inclined outwards - braces braced with each other with wire - connected the box spars of both wings. Both wings had an approximately rectangular plan with constant wing depth, the upper one had a span about 1.6 times as large as the lower wing. The aircraft was made entirely of wood, the leading edge of the wing was clad with two layers of plywood , the rest of the wing was covered with fabric and partially movable. The wing profile was an in-house development. It was steered around the longitudinal axis by twisting the wing .
The aircraft had a four- frame , 70 cm wide and high, 4.20 m long fabric-covered wooden framework fuselage with a rectangular cross-section. The almost rectangular, 2.80 wide and 65 cm deep, damped horizontal stabilizer was on the upper side of the end of the fuselage, as was the vertical stabilizer with a semicircular rudder . All tail surfaces were fabric-covered wooden constructions. The standing pile had two 5 cm wide, double-curved ash runners on the sides of the underside of the fuselage.
use
The bunch flew for the first time in 1921 as part of the Rhön competition . Muttray's first flight on August 23 over 400 meters lasted 38 seconds and brought him glider pilot license number 13; five days later it was already flying for three minutes. More than a third of the planes involved were double-deckers, the bunch of them being the only one that carried out longer flights. Its three designers were awarded 1,500 marks in prize money. After the end of the competition, the aircraft stayed on the Wasserkuppe until September, made flights of up to 4.5 minutes and thus enabled Seiferth and Spies to meet the requirements for glider license nos. 14 and 15. The pile was damaged in the course of these flights and started its journey home as rail freight. In the course of the revision of the construction, the span of the upper wing was increased to 9 m. The flight tests of the rebuilt machine began in the spring of 1922 in the new airfield near Geising in the Ore Mountains , also in the rubber rope launch . In the 3rd Rhön competition in 1922, the aircraft won first prize for flight duration and a second for a distance of 2.7 kilometers.
In 1923, the stand-up could not take part in the competition because it broke during the acceptance flight before the technical commission.
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 |
| length | 4.80 m |
| Span (top) | 8 m (from 1922: 9 m) |
| Span (below) | 6 m |
| height | 2 m |
| Wing area | 18.7 m² |
| Empty mass | 70 kg |
| Flight mass | 140 kg |
| Glide ratio | 8th |
See also
Web links
- Dresden D-B01 Standing pile in the glider database J2mcL Planeurs
Individual evidence
- ↑ a b c d e Karlheinz Kens: The Dresden stand-up . In: Historic German aircraft up to 1945 . 2nd Edition. tape 1 . Modellsport Verlag, Baden-Baden 2011, ISBN 978-3-923142-39-2 , p. 58-63 .
- ^ A b Roland Eisenlohr : The motorless flight . Gliders and gliders. In: Aviation Library . tape 14 . Richard Carl Schmidt & Co., Berlin 1922, p. 76 f .
- ^ Soaring flight in Germany. Flightglobal.com, September 8, 1921, accessed July 1, 2016 .
- ↑ German gliders. Flightglobal.com, September 21, 1922, accessed July 1, 2016 .