Zlín Z 37

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Z-37 Čmelák
Let Z37A LKCV.jpg
Z-37 Čmelák
Role Agricultural aircraft
Manufacturer Let, Moravan
First flight 29 June 1963
Status in use
Primary user Czechoslovak civilian aviation
Produced 1965-1987
Number built ~713

The Zlin Z-37 Čmelák (Czech: "Bumblebee"), also known as LET Z-37 Čmelák is an agricultural aircraft was manufactured in Czechoslovakia. The aircraft is used mainly as a cropduster.

Design and development[edit]

Design work upon the first purpose-designed agricultural plane started in Czechoslovakia in 1961, in a cooperation of two manufacturers: Let Kunovice and Moravan (Zlin brand). The first prototype, designated as XZ-37, first flew on 29 March 1963[1] (other sources:29 June)[citation needed]. It was a cantilever low-wing monoplane of tubular metal construction, the wings and stabilizers are covered with duralumin and the fuselage and control surfaces are made of fabric. It had a fixed undercarriage with a fully castering tailwheel, but locked to the rudders for ground handling. The pilot's cockpit was in front, immediately behind a 315 hp radial engine, with a hopper for chemicals situated behind the cockpit. This offered the pilot a good view, but was potentially dangerous in case of an emergency landing. A mechanic could be seated behind the hopper, facing backwards.[1] There were also spray booms mounted under the wings. There is also a freight version with open space instead of hopper and spray equipment and a -3 variant with 3 passenger seats facing rearwards.

The plane was produced from 1965 under a designation Z-37. From 1971, the Z-37A was produced, with a strengthened construction. It was produced until 1975, and then in 1983-1984. 677 were produced, including 27 two-seater Z-37A-2 for crew training.

On 6 September 1981 the prototype XZ-37T first flew, powered by a (691 shp) Walter M-601B turboprop engine. Two further prototypes of the definitive turboprop version, the Z-37T Agro Turbo, powered by a less powerful M-601Z engine, flew on 12 July and 29 December 1983. As well as the new engine, it had longer span wings (13.63 m) fitted with winglets.[2]

The Z-37T was produced from 1985 until 1994, with a total of 51 aircraft built.,[3] including some Z-37T-2 two-seater trainers. Later production aircraft were redesignated Zlin Z-137T.[4]

Operational history[edit]

The main user of Z-37s was Czechoslovakia (now Czech and Slovak Republics) along with East Germany and other Eastern Bloc countries. Many were exported to the Sudan and India and flown there almost non-stop with the hopper used as extra fuel tank. Variants are as far a field as England and the USA. Current use is limited because of fuel costs and are now used mainly in Slovakia. Many are used for glider towing, having the ability to easily tow 2 gliders and often transport 4 gliders in tow for cross country.

A record has been set by a Z 137T in Slovakia towing nine gliders.[citation needed]

Variants[edit]

Z-37
Z37-3 OK-NJD
Z37-2 G-KDLN (now OK-ZZZ)
XZ-37
First prototype.
Z-37
First production version built between 1965 and 1971.
Z-37A
Second production version with strengthened construction. Built between 1971 and 1975 and later between 1983 and 1984, 650 built.
Z-37A-2
Two seat version for crew training, 27 built.
Z-37A-3
Pilot plus three passenger version. Conversion of "A" version. Rear-facing seats.
XZ-37T
Prototype of the turboprop version powered by Walter M-601B engine, built in 1981.
Z-37T Agro Turbo
Turboprop version with bigger span wings, powered by Walter M-601Z engine and built between 1985 and 1987. 28 built including Z-37T-2 trainer.
Z-37T-2
Two seat turboprop version for crew training built between 1985 and 1987.
Z-137T
Further development version.

Operators[edit]

Z37-3 Cockpit
Z37-2 Rebuilt!
 Czech Republic
 Slovakia (Slov-Air)
 Bulgaria
 Finland
 Hungary
 India
 Iraq
 New Zealand
 United Kingdom
  • John Richards

Former operators[edit]

 East Germany
 Yugoslavia

Aircraft on display[edit]

Bulgaria

A Zlin Z-37 is on display. [1]

Serbia

A Zlin(LET) Z-37A is on display. [2]

New Zealand

A Zlin(LET) Z-37T Agro Turbo is on display.

Specifications (Z-37A)[edit]

Loading hopper for spraying
A bad Cmelak landing
Z37-2 starting up
Z37A - English Museum

Data from Jane's All the World's Aircraft 1976-77 [5]

General characteristics

  • Crew: 1, pilot
  • Capacity: 1, mechanic (optional), 650 l of chemicals
  • Length: 8.55 m (28 ft 0½ in)
  • Wingspan: 12.22 m (40 ft 1¼ in)
  • Height: 2.90 m (9 ft 6 in)
  • Wing area: 23.80 m² (256.2 ft²)
  • Empty weight: 1,043 kg (2,295 lb)
  • Loaded weight: 1,850 kg ()
  • Useful load: 600 kg ()
  • Max. takeoff weight: 1,850 kg (4,080 lb)
  • Powerplant: 1 × Walter M 462RF air-cooled 9-cylinder radial engine (supercharged), 235 kW (315 hp)

Performance

  • Never exceed speed: 270 km/h (145 knots, 167 mph)
  • Maximum speed: 210 km/h (113 knots, 130 mph)
  • Cruise speed: 183 km/h (99 knots, 114 mph)
  • Stall speed: 81 km/h (45 knots, 51 mph)
  • Range: 640 km (345 NM, 398 mi)
  • Service ceiling: 4,000 m (13,125 ft)
  • Rate of climb: 4.7 m/s (925 ft/min)
  • Take-off run: (no load) less than 50 m (170 ft) - loaded from 125 metres (410ft) in still air
  • Landing run: less than 100 metres in still air
  • Fuel Capacity: 250 litres
  • Fuel Grade: Not less than 73 Octane (Unleaded 95 usually used)
  • Fuel Consumption: 52 litres per hour cruise, 110 litres per hour full power

See also[edit]

Aircraft of comparable role, configuration and era

References[edit]

Turbo Cmelak towing 9 gliders
Flying over Leipzig
  1. ^ a b J.W.R Taylor 1976, p.30.
  2. ^ J.W.R Taylor 1988, p.52.
  3. ^ "History of production of ZLIN aircraft". Zlin Aircraft. Retrieved 2008-11-03. [dead link]
  4. ^ M. Taylor 1996, p.389.
  5. ^ J.W.R. Taylor 1976, pp.30—31.
  • Taylor, J.W.R (editor) (1976). Jane's All the World's Aircraft 1976-77. London: Macdonald and Jane's. ISBN 0-354-00538-3. 
  • Taylor, JWR (Editor) (1988). Jane's All the World's Aircraft, 1988-1989. Coulsden, Surrey, UK: Jane's Information Group. ISBN 0-7106-0867-5. 
  • Taylor, Michael (editor) (1996). Brassey's World Aircraft & Systems Directory 1999/97 Edition. London: Brassey's. ISBN 1-85753-198-1. 
  • Hans-Joachim Mau: Tschechoslowakische Flugzeuge, Transpress, Berlin 1987, ISBN 3-344-00121-3
  • Photo and description (in Slovak)

External links[edit]