PZL S-1

PZL S-1
Role	Trainer and liaison aircraft
Manufacturer	PZL-Mielec
First flight	15 November 1945
Retired	1946
Status	prototype
Primary user	Polish Air Force
Number built	1

The PZL S-1 was a Polish trainer and liaison aircraft of 1945, which remained a prototype. It was the second aircraft built in Poland after World War II.

Design and development

The aircraft was designed by engineer Eugeniusz Stankiewicz, being a teacher in the Aviation School in Zamość. Works started in late 1944, soon after liberation of eastern Poland, when central and western parts were still occupied by the Germans. The design of a trainer and liaison plane was approved by the Polish military Aviation Command, and Stankiewicz completed documentation in an aircraft factory PZL-Mielec in Mielec (the factory was destroyed by the Germans and at that time existed as repair works only).

There, a prototype was built, utilizing parts of the Soviet Polikarpov Po-2, like an engine with a propeller, wheels and seats, also a construction of a fuselage was similar to the Po-2. The plane, named S-1 (for Stankiewicz), was very simple. It was flown on 15 November 1945, by the Soviet pilot Piotr Kondratyenko. It was the second Polish-designed plane, that flew after the war (the first was LWD Szpak). Further aircraft were not produced.

The prototype crashed on 14 May 1946 in Warsaw in a bad weather, its pilot, who was Stankiewicz himself, survived.

Description

Wooden construction braced high-wing (parasol wing) monoplane, conventional in layout. Fuselage built of a frame, plywood and cancas covered. Rectangular wing with rounded tips, two-spar. Crew of two, sitting in tandem, in open cockpits with windshields. Fixed conventional landing gear, with a rear skid. Radial engine M-11D in front, with a Townend ring, two-blade wooden propeller (2.4 m diameter). Fuel tanks 126 l.

Specifications

General characteristics

• Crew: 1, instructor
• Capacity: 1, student
• Length: 8.5 m ()
• Wingspan: 13 m ()
• Height: 3.2 m ()
• Wing area: 20 m² (ft²)
• Empty weight: 700 kg ()
• Loaded weight: 950 kg ()
• Powerplant: 1 × Shvetsov M-11D air-cooled 5-cylinder radial engine, 125 hp (92 kW)

Performance

• Maximum speed: 180 km/h
• Stall speed: 55 km/h (34 kt, 39 mph)
• Range: 600 km ()
• Service ceiling: 3,800 m ()
• Rate of climb: 3 m/s ()
• Wing loading: 60 kg/m² ()

See also

Related development

• Polikarpov Po-2 - PZL S-3
  

References

• PZL S-1 at Poser site
• Janusz Babiejczuk, Jerzy Grzegorzewski: Polski przemysł lotniczy 1945-1973, Warsaw 1973 (Polish language)

External links

• Silhouette