| 词条 | PZL M-4 Tarpan | ||||||||||||||||
| 释义 |
PZL M-4 Tarpan (also tarpan) was a Polish trainer and sports aircraft prototype of the 1960s, designed in WSK-Mielec. Design and developmentThe M-4 was designed for a demand of the Polish Aero Club, for a trainer plane with a retractable tricycle landing gear. It was based on an earlier project PZL M-2. The basic variant was to be M-4P, for navigation training. The works started in 1958, and the first prototype was built in 1960. Due to a long engine development, it first flew on September 7, 1961 (registration SP-PAW). Trials showed, that the weight was much higher, than estimated (890 kg instead of 748 kg), which demanded changes in design. In July 1964 the second prototype was flown (registration SP-PAK). Flight characteristics and stability of the M-4 were estimated as good, it also fit to aerobatics and rally flying. The cab offered an excellent view for the crew and the plane was overall quite successful. However, because of too high price, the Polish Aero Club decided not to order the plane and the production has not started. A development of the flat engine PZL WN-6 was troublesome and was finally canceled at that time as well. Operational historyIn 1965 both prototypes were converted to single seater aerobatics variant (in some sources known as the M-4A) by removing front cab equipment. It was planned to use them in World Aerobatics Championship in 1966 in Moscow, but they have not finished full homologation trials and the idea was abandoned. They were not used in this role much. Operators
SurvivorsThe second M-4 prototype (SP-PAK) is preserved in the Polish Aviation Museum in Kraków, from 1971. SpecificationsDescriptionMetal construction low-wing monoplane, conventional in layout, metal covered. Semi-monocoque fuselage. Trapezoid two-spar wings. Crew of two, sitting in tandem, under a common canopy, with double controls (student in front, instructor in the rear). Retractable tricycle landing gear. Two-blade wooden propeller of variable pitch (diameter 2 m). Fuel tanks in wings (140 l). {{Aircraft specifications|plane or copter?=plane |jet or prop?=prop |crew=1, instructor |capacity=1, student |length main=7.35 m |length alt=24 ft 1¼in |span main=8.85 m |span alt=29 ft 0⅜in |height main=2.61 m |height alt=8 ft 6¾ in |area main=11.79 m² |area alt=127 ft² |empty weight main=888 kg |empty weight alt=1,954 lb |loaded weight main=1,200 kg |loaded weight alt=2,640 lb |useful load main= |useful load alt= |max takeoff weight main= |max takeoff weight alt= |engine (prop)=WN-6B |type of prop= air-cooled 6-cylinder boxer engine |number of props=1 |power main=143 kW |power alt= 195 hp |max speed main=300 km/h |max speed alt= 162 kn, 186 mph |cruise speed main= 260 km/h |cruise speed alt= 140 kn, 161 mph |stall speed main= <101 km/h |stall speed alt= 55 kn, 63 mph |range main=750 km |range alt= 405 nmi, 466 mi |ceiling main=4400 m |ceiling alt=14,400 ft |climb rate main=4.2 m/s |climb rate alt=830 ft/min |loading main= 102 kg/m² |loading alt= 20.8 lb/ft² |thrust/weight= |armament= }} See also{{Aircontent||related= |similar aircraft=
|sequence= |lists= |see also= }} References{{commons category|PZL M-4 Tarpan}}
6 : Polish civil trainer aircraft 1960–1969|Polish sport aircraft 1960–1969|PZL aircraft|Low-wing aircraft|Single-engined tractor aircraft|Aircraft first flown in 1961 |
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