Lommatzsch FES-530
| Lommatzsch FES-530 teacher | |
|---|---|
 FES-530 / II in the Cottbus Airfield Museum |
|
| Type: | School glider |
| Design country: | |
| Manufacturer: |
VEB Apparatebau Lommatzsch |
| First flight: |
June 15, 1954 |
| Commissioning: |
1957 |
| Production time: |
1955-1962 |
| Number of pieces: |
223 |
The FES-530 Lehrmeister is a two-seater school sailor that was developed in the 1950s. With this type and the Czechoslovakian LF-109 "Pionýr" , the GST of the GDR made the transition from the single to the two-seat school method. It was also the first aircraft developed and mass-produced in the GDR.
development
The construction was carried out in the winter of 1953 at VEB Waggonbau Gotha by Hans Wegerich (aerodynamics), Wilhelm Zimmermann (statics) and Hans Hartung (construction) under the direction of technical director Gerhard Renner under the name Gotha Go 530 in all-wood construction. The latter also carried out the successful maiden flight with the prototype Go 530 V1 on June 15, 1954 in Bienstädt . However, on one of the following flights, Renner collided with a tree during landing, which resulted in damage to the fuselage and wings. The aircraft could be repaired and Renner's permission for further test flights was withdrawn. The subsequent tests were carried out by Karl Treuter and Kurt Götze . On July 22, 1954, the first aircraft tow took place with a Z-126 and on November 8, the model was granted state approval with the official designation FES-530 (for research and development center). At this point in time, production had already been relocated to VEB Apparatebau Lommatzsch , which was founded in the same year on the site of a former glassworks . In 1955 the first series version of the FES-530 appeared with a braced wing in a high- wing design . At the same time, the testing with the now two prototypes, Karl Treuter had started flights with the FES-530 V2 on April 5, 1955 in Leipzig-Mockau , continued. An incident occurred when, at the end of the test on November 24th of that year, all wing ribs tore off during a speed test in orbit flight . Treuter was still able to land the plane and a subsequent investigation revealed manufacturing errors as the cause. As a result of the incident, extensive fracture tests were carried out at the Institute for Aircraft Construction, which dragged on until the beginning of 1957. Probably because of this delay, the model was therefore only delivered to GST from 1957. In 1959 the teacher was further developed into the FES-530 / I with a cantilever wing. In the same year the FES-530 / II "Teacher II" was created, which was reduced by two meters in wingspan .
A total of 223 copies of the FES-530 were built, 22 of which were exported abroad (Denmark, Syria, Egypt and Cuba). A FES-530 / II ( registration number DM-3264 ) went to Austria as a gift and flew there with the connoisseur OE-0702 . It was brought back to Schönhagen in 2002 and there - with the help of the former workshop manager of the GST's Central Aviation School, Johannes Höntsch - largely overhauled true to the original. The instructor replaced the single-seater SG 38 school glider, which had been in use until then and was still in use in the 1930s, and was flown in the GDR until the end of the 1970s. It was replaced by the Bocian 1E from Poland. A rebuilt FES-530 ( DM-3152 ) has been flying in Pirna since 2004 .
Technical specifications
| Parameter | FES-530 | FES-530 / I | FES-530 / II |
|---|---|---|---|
| number of pieces | 100 | 22nd | 101 |
| crew | 2 | ||
| span | 17.00 m | 15.00 m | |
| length | 7.95 m | ||
| height | 2.12 m | ||
| Wing area | 19.00 m² | 17.93 m² | |
| Wing extension | 15.20 | 12.54 | |
| Empty mass | 300 kg | 280 kg | 270 kg |
| Payload | 200 kg | 60-200 kg | |
| Takeoff mass | 500 kg | 480 kg | 470 kg |
| Wing loading | 26.3 kg / m² | 25.30 kg / m² | 26.20 kg / m² |
| Best glide ratio | 24 at 85 km / h | 26 at 78 km / h | 23 at 81 km / h |
| Slightest sinking | 0.85 m / s at 72 km / h | 0.80 m / s at 74 km / h | 0.95 m / s at 72 km / h |
| Minimum speed | 58 km / h | ||
| Maximum speed allowed | 200 km / h | ||
literature
- Frank-Dieter Lemke: The rise and fall of GDR aircraft construction . In: Fliegerrevue . No. 4/1992 .
- The GST gliders . In: Fliegerrevue . No. 5/1989 .
- Heinz AF Schmidt: Airplanes from all over the world. Volume I . 3rd revised edition. Transpress, Berlin 1970, p. 35 .
- Frank-Dieter Lemke: Glider construction in the GDR . Ideas and projects - replicas and new constructions. Rockstuhl, Bad Langensalza 2018, ISBN 978-3-95966-303-8 .
