Let Z-37
| Let Z-37 Čmelák | |
|---|---|
 Z-37A-2 |
|
| Type: | Agricultural aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
June 29, 1963 |
| Commissioning: |
1965 |
| Production time: |
1965-1980, 1983-1985 |
| Number of pieces: |
631 + 42 Z-37T |
The Let Z-37 Čmelák ( German Hummel ) is a Czech multi-purpose aircraft that LET designed as an agricultural aircraft in the early 1960s . It also served as a tow plane, but also as a trainer, transport, aerial photography, fire-fighting and observation aircraft.
history
In close cooperation with Moravan , LET began developing the Z-37 in 1961 due to the placing of an order by the Comecon to the ČSSR for an agricultural aircraft. Miroslav Langr was responsible for the construction, Ladislav Smrček took over the overall management. There was a metal low-wing aircraft with partial fabric covering, cantilevered wings and a radial engine Avia M-462RF with 228 kW (310 hp). On June 29, 1963, the prototype XZ-37 took off on its maiden flight . It was presented for the first time and flown to the representatives of the Comecon Member States in Otrokovice on November 13 of the same year. The production version Z-37A was built 631 times from 1965 to the end of the 1970s, 27 of them as a two-seat training aircraft with the designation Z-37A-2 Sparka . Equipped with spray and centrifugal wheel devices for liquid and powdery substances, it served from the 1960s in forestry and agriculture, including in the GDR . Let also exported the Z-37 to Bulgaria, Finland, Great Britain, India, Iraq, Yugoslavia, Poland, Hungary and Mongolia.
From 1976 studies were carried out on a version with a PTL engine. On September 6, 1981, a prototype XZ-37T with a propeller turbine (Walter M601B with 515 kW / 691 shaft PS) flew for the first time . Production was resumed from 1983 at Moravan under the name Z-37T Agro-Turbo . These series models received the Motorlet 601Z turboprop engine and were delivered from 1985. 42 pieces were built.
From 1981 the Z-37T and Z-137T were produced, also equipped with turbo -prop engines with 360 kW and 382 kW. The span was increased to 13.63 m and winglets were added.
Today there are only a few ready-to-fly machines of this type and are mostly in private hands.
General data
| Parameters | Let Z-37A | Moravan Z-37T |
|---|---|---|
| Year of construction (s) | from 1963 | from 1981 |
| Manufacturer | LET | Moravan |
| crew | 1 | |
| span | 12.22 m | 13.63 m |
| length | 8.55 m | 10.46 m |
| height | 2.89 m | k. A. |
| Wing area | 23.80 m² | 26.69 m² |
| Wing extension | 6.27 | 6.96 |
| Wing loading | 77.7 kg / m² | |
| Power load | 6.00-9.4 kg / hp | k. A. |
| Empty mass | 970 kg | 830 kg |
| Payload | 600 kg of chemicals | k. A. |
| Takeoff mass | maximum 1850 kg | 2200 kg |
| drive | a nine-cylinder radial engine Avia / Walter M-462RF with two-blade adjustable propeller V-520 (ø 2.70 m) |
a PTL Walter M-601B |
| power | 228 kW (310 hp) at 2450 rpm take-off power 206 kW (280 hp) nominal power 143.5 kW (195 hp) travel power |
535 kW (727 hp) |
| Fuel supply | normal 125 l internal (left wing container) maximum 250 l internal (both wing containers) maximum 510 l (with external containers) |
k. A. |
| Top speed | 200 km / h | k. A. |
| Cruising speed | 165-185 km / h | 140-160 km / h |
| Working speed | 120 km / h | k. A. |
| Minimum speed with flap position |
76 km / h at 50 ° 77 km / h at 15 ° 80 km / h at 5 ° |
k. A. |
| Rate of climb | 4.7 m / s without equipment | k. A. |
| Service ceiling | 4050 m | k. A. |
| Range | normal 550 km maximum 650 km |
k. A. |
literature
- Detlef Billig, Tobias Harzendorf: Zlin ... In: type show . No. 03 . TOM-Modellbau, Friedland 2006, ISBN 3-939439-02-9 .
- Hans-Joachim Mau: Czechoslovak aircraft . 1st edition. Transpress, Berlin 1987, ISBN 3-344-00121-3 , p. 128/129 .
- Heinz A. F. Schmidt: Airplanes from all over the world . 3rd revised edition. Transpress, Berlin 1970, p. 17 .
- Claus Märten: Z-37 "Čmelak" . In: Illustrated series for type collectors . No. 31 . German military publisher, Berlin 1967.
Trivia
On August 25, 1973, a family from the GDR successfully used a bumblebee to flee to the West. Between 1973 and 1987, a total of seven Z-37A were successfully used for "escapes from the republic ".
Web links
- Type certification of the Z-37 - EASA-TCDS-A.445 (PDF; 221 kB)
- Type certification of the Z-37 T - EASA-TCDS-A.443 (PDF; 153 kB)
- Eisenach: The gruesome end of an air show. In: Spiegel Online . April 26, 2008, accessed January 2, 2017 .
Individual evidence
- ↑ a b Manfred Jurleit: Zlin Z-37 Cmelak . In: Flieger Revue . No. 2/1993 , p. 42 .
- ↑ Flugzeuginfo.net, Zlin (Moravan) Zlin Z 37T / Z 137T Agro-Turbo
- ↑ Utility-aircraft.com, Zlin Z-137T ( Memento from June 24, 2015 in the Internet Archive )
- ↑ Michael Schmidt: With the "Hummel" in the West | svz.de. Retrieved February 24, 2019 .
- ^ Jörg Mückler: German-German border flights. In: Fliegerrevue Extra. No. 16, Möller, Berlin 2007, ISSN 0941-889X, p. 25
