PZL (Państwowe Zakłady Lotnicze - State Aviation Works) was the main Polish aerospace manufacturer of the interwar period, and a brand of their aircraft. Based in Warsaw between 1928 and 1939, PZL introduced a variety of well-regarded aircraft, most notably the PZL P.11 fighter, the PZL.23 Karaś light bomber, and the PZL.37 Łoś medium bomber.
| Industry | Aerospace |
|---|---|
| Predecessor | Centralne Warsztaty Lotnicze |
| Founded | 1928 |
| Defunct | 1989 |
| Fate | Broken up |
| Successors |
|
| Headquarters | , |
Key people | |
| Subsidiaries | Podlaska Wytwórnia Samolotów (1937–1939) |
In the post-war era, aerospace factories in Poland were initially run under the name WSK (Transport Equipment Manufacturing Plant), but returned to adopt PZL acronym in late 1950s. This was used as a common aircraft brand and later as a part of names of several Polish state-owned aerospace manufacturers referring to PZL traditions, and belonging to the Zjednoczenie Przemysłu Lotniczego i Silnikowego PZL - PZL Aircraft and Engine Industry Union. Among the better-known products during this period is the PZL TS-11 Iskra jet trainer and PZL-104 Wilga STOL utility aircraft.
After the fall of communism in Poland in 1989, these manufacturers became separate companies, still sharing the PZL name. In the case of PZL Mielec, the abbreviation was later developed as Polskie Zakłady Lotnicze - Polish Aviation Works. Over time, most of the now-separate divisions were purchased by foreign concerns, and some continue to use PZL brand.
History edit
PZL (1928-1939) edit
The PZL - Państwowe Zakłady Lotnicze (State Aviation Works) was founded in Warsaw in 1928 as a state-owned company, and was based on the earlier CWL (Centralne Warsztaty Lotnicze) - Central Aviation Workshops.[1] First to be produced was a licensed version of a French fighter, the Wibault 70, but from then on the company produced exclusively its own designs. In the next decade a talented designer Zygmunt Puławski designed a series of high-wing, all-metal modern fighters: PZL P.1, P.6, P.7 and P.11. The latter two types were used as basic fighters in the Polish Air Force from 1933 onwards. The last variant, PZL P.24, developed after Puławski's death in an air crash, was exported to four countries. PZL also mass-produced a light bomber, PZL.23 Karaś, and a modern medium bomber, PZL.37 Łoś, as well as building small numbers of sport aircraft (PZL.5, PZL.19, PZL.26), and liaison aircraft (PZL Ł.2); and developing prototypes of passenger aircraft. In the late 1930s the company also developed several prototypes of more modern fighters and bombers — and a passenger airliner, the PZL.44 Wicher. However, World War II prevented these aircraft from entering production. PZL was the largest Polish pre-war aircraft manufacturer.
In 1934, the main factory in Warsaw was named PZL WP-1 (Wytwórnia Płatowców 1 - Airframe Works 1) in the Okęcie district of Warsaw. A new division PZL WP-2 was built in Mielec in 1938-1939, but production was only just starting there at the outbreak of World War II.[1] An engine factory division, PZL WS-1 in Warsaw-Okęcie (Wytwórnia Silników - Engine Works 1), produced mostly licensed versions of British Bristol engines, such as the Bristol Pegasus and the Bristol Mercury. The WS-1 factory was former Polskie Zakłady Skody, the Polish division of Skoda Works, and was nationalized and renamed in 1936. In 1937-1939 a new engine division, PZL WS-2, was built in Rzeszów.[2]
Situation post-war edit
During World War II and the five-year German occupation, all Polish aviation industry was taken over by German firms, and as a result, almost completely destroyed. By the end of the war, all factories were either ruined or robbed of tooling.[3] Despite it, from 1944 there were carried out efforts to design new aircraft, in primitive conditions (first of all, in the LWD). No engines nor suitable production facilities were available at first.[4] The post-war communist government of Poland wanted to break all connections with pre-war Poland[citation needed]: from the late 1940s the name PZL ceased to be used, and new aerospace factories were named WSK (Wytwórnia Sprzętu Komunikacyjnego - Transport Equipment Manufacturing Plant). Under the Soviet-influenced, centrally planned economy, all indigenous projects were abandoned, in a favour of manufacturing Soviet-licensed aircraft.[4] No own designs were produced for a decade, and only in late 1950s, after the stalinist period (1956), did the PZL brand return to designing new aircraft.
The ZPLiS PZL - Zjednoczenie Przemysłu Lotniczego i Silnikowego PZL - PZL Aircraft and Engine Industry Union, which grouped all state-owned aerospace industry factories, was created in following years, but it only enjoyed some economic autonomy from 1973 onwards.[5] It consisted of 19 factories, a research institute, and the Pezetel Foreign Trade Center - CHZ Pezetel, which represented all the Polish aerospace industry abroad (Pezetel being the pronunciation of an abbreviation PZL in Polish).[5] Consequently, in the 1970s some WSK factories also introduced the PZL abbreviation to their names. After the fall of communism in Poland in 1989, all manufacturers became separate companies, initially state-owned, still sharing the PZL name.
Locations edit
PZL "Warszawa-Okęcie" edit
The main factory PZL WP-1 in Warsaw was destroyed during World War II, mostly during the German evacuation in 1944. In 1946, the CSS construction bureau (Centralne Studium Samolotów - Central Aircraft Study) was set up there. As the factory was rebuilt, it was renamed in 1950 as the WSK Nr.4, and in 1956 as the WSK-Okęcie.[6]
It first produced licensed versions of Soviet types and aircraft developed by other Polish companies. From 1958 onwards it started to produce its own designs under the PZL brand, starting with the PZL-101 Gawron. The factory developed mainly light sports, trainer and utility aircraft. An attempt of producing and airliner PZL MD-12 was unsuccessful. The best-known designs are the PZL-104 Wilga utility aircraft, which was produced in larger numbers than any other Polish-designed aircraft; and the PZL-106 Kruk agricultural aircraft. During the 1970s the factory adopted the name WSK "PZL Warszawa-Okęcie", which after the fall of the communist system was changed in 1989 to PZL Warszawa-Okęcie. In 2001 the factory was bought by the Spanish company EADS CASA (now part of Airbus Defence and Space) and since then has been known as EADS PZL Warszawa-Okęcie SA.
WSK "PZL-Mielec" / PZL Mielec edit
The PZL WP2 factory in Mielec became a part of Heinkel during the German occupation of Poland, and manufactured parts for German aircraft. After the war the factory was named first PZL No.1 works,[7] then from 1949 WSK-Mielec, and later WSK "PZL-Mielec". It became the biggest post-war Polish aircraft producer.[7] It manufactured mostly licensed Soviet types, such as the Antonov An-2 transport biplane and early jet fighters: Mikoyan-Gurevich MiG-15 (as Lim-1 and Lim-2) and Mikoyan-Gurevich MiG-17 (as Lim-5 and Lim-6). It also produced the Polish-designed TS-8 Bies piston trainer and TS-11 Iskra jet trainer, and the PZL M-15 Belphegor the world's only jet agricultural aircraft. Large numbers of aircraft were exported abroad, mostly to the USSR.[7] From the 1970s onward it produced mostly its own developments of licensed civil aircraft, the best known are the PZL M-18 Dromader agricultural aircraft, which was exported to numerous countries, and the PZL M-28 Skytruck/Bryza light transport aircraft. In 1998 the state factory WSK PZL-Mielec went bankrupt and was changed into the state-owned Polskie Zakłady Lotnicze Sp.z o.o. (Polish Aviation Works) (PZL Mielec).
On March 16, 2007, PZL Mielec was purchased by the Sikorsky Aircraft Corporation, a unit of United Technologies Corporation (UTX). It still produces M-18 and M-28 aircraft.
WSK "PZL-Świdnik" edit
In 1951 a third national aerospace factory, WSK-Świdnik, was built in Świdnik,[8] and in 1957 it was renamed to WSK "PZL-Świdnik". Since 1956 it has become one of the world's major helicopter manufacturers, producing helicopters under Soviet licences, starting from the SM-1 (Mil Mi-1).[8] Świdnik was the main producer of the Mi-1 and the exclusive producer of the Mil Mi-2, which was widely used throughout the world. Since the late 1980s, Świdnik has been producing a Polish-designed medium helicopter PZL W-3 Sokół. It also produces a light helicopter, the PZL SW-4 Puszczyk. After 1991 the state factory became a state-owned corporation (WSK "PZL-Świdnik" SA). It also produced the SZD-30 Pirat, PW-5 and PW-6 gliders and cooperates widely with other nations' manufacturers, e.g., in the manufacture of Agusta A109 fuselages.
In early 2010 the factory was acquired by AgustaWestland.
PZL-Bielsko / Allstar PZL Glider edit
Glider manufacturer SZD (Szybowcowy Zakład Doświadczalny - Glider Experimental Works) was created in Bielsko-Biała in 1948. The company grew and had production plants in additional locations, during this process it was renamed several times until it got its name PZL-Bielsko in the 1990s. It was one of the biggest sailplane factories and exported its gliders world-wide.[9]
In 2002 Allstar PZL Glider Sp. z o.o. acquired the production plant in Bielsko-Biala and the Type Certificates of the following SZD sailplanes: SZD-59-1 Acro - a single-seater for aerobatics and cross-country, SZD-54-2 Perkoz – a double-seater training-glider for aerobatic and cross-country, SZD-55-1 Nexus – a single seater glider of the standard class, SZD-51-1 Junior - single seater training glider of the club class, SZD-50 Puchacz - double-seater training-glider and SZD-48-3 Jantar Standard 3 – single-seater glider of standard class.
The company further manufactures and develops the first four SZD-glider models. Allstar PZL Glider is also producing and distributing spare parts for all six types mentioned above. On the occasion of the air show “Aero” 2019 in Friedrichshafen Allstar PZL Glider has presented its proof-of-concept of a new electric propulsion system for the SZD-55 Nexus. The electric sustainer, developed by the company and named “Allstar-e-motion”, is right now in the advanced certification process. The system will also be available as an assembly kit for retrofitting of existing SZD-55s.[10]
WSK-Rzeszów edit
The engine division WS-2 of the PZL was built in Rzeszów in 1937-1939.[2] After the war it still bore a name PZL (Państwowe Zakłady Lotnicze) until 1951, when it was renamed WSK-Rzeszów.[11] From 1949 it manufactured Soviet-licensed M-11 engines, later, among others, ASh-62IR, turboshaft engines GTD-350 and Polish jet engines SO-1.[11] The factory was bought by United Technologies in 2002 and changed its name to Pratt & Whitney Rzeszów in 2015.[12]
WSK "PZL-Kalisz" edit
In 1952 the engine manufacturer WSK-Kalisz was created. It manufactured mostly Soviet-licensed engines, first piston (the Shvetsov ASh-82 and the Ivchenko AI-14) and then jet (the Klimov VK-1). It also produced Polish piston engines, such as the WN-3, and other equipment. In October 1996 it was renamed WSK "PZL-Kalisz" and became a corporation (SA).
WSK "PZL Warszawa II" edit
WSK Warszawa II was created in 1952 in Warsaw as a manufacturer of aircraft parts and military equipment parts. In 1995 it was changed from a state factory to a corporation WSK "PZL Warszawa II" SA.
Aircraft edit
| Model name | First flight | Number built | Type |
|---|---|---|---|
| PZL P.1 | 1929 | 2 | Single piston engine monoplane fighter |
| PZL Ł.2 | 1930 | 31 | Single piston engine monoplane liaison airplane |
| PZL.3 | N/A | 0 | Four piston engine monoplane bomber |
| PZL.4 | 1932 | 1 | Three piston engine monoplane airliner |
| PZL.5 | 1930 | 15 | Single piston engine biplane sport airplane |
| PZL P.6 | 1930 | 1 | Single piston engine monoplane fighter |
| PZL P.7 | 1930 | 151 | Single piston engine monoplane fighter |
| PZL P.11 | 1931 | 325 | Single piston engine monoplane fighter |
| PZL.12 | 1931 | 1 | Single piston engine monoplane flying boat |
| PZL.16 | 1932 | 1 | Single piston engine monoplane utility airplane |
| PZL.19 | 1932 | 3 | Single piston engine monoplane sport airplane |
| PZL.23 Karaś | 1934 | 253 | Single piston engine monoplane light bomber |
| PZL P.24 | 1933 | 184 | Single piston engine monoplane fighter |
| PZL.26 | 1934 | 5 | Single piston engine monoplane sport airplane |
| PZL.27 | 1934 | 1 | Three piston engine monoplane airliner |
| PZL.30 Żubr | 1936 | 20 | Two piston engine monoplane bomber |
| PZL.37 Łoś | 1936 | 120+ | Two piston engine monoplane bomber |
| PZL.38 Wilk | 1938 | 2 | Two piston engine monoplane fighter-bomber |
| PZL.43 | 1937 | 54 | Single piston engine monoplane light bomber |
| PZL.44 Wicher | 1938 | 1 | Twin piston engine monoplane airliner |
| PZL.45 Sokół | N/A | 0 | Single piston engine monoplane fighter |
| PZL.46 Sum | 1938 | 2 | Single piston engine monoplane light bomber |
| PZL.48 Lampart | N/A | 0 | Two piston engine monoplane fighter-bomber |
| PZL.49 Miś | N/A | 0 | Two piston engine monoplane bomber |
| PZL.50 Jastrząb | 1939 | 1 | Single piston engine monoplane fighter |
| PZL.53 Jastrząb II | N/A | 0 | Single piston engine monoplane fighter |
| PZL.54 Ryś | N/A | 0 | Two piston engine monoplane heavy fighter |
| PZL.55 | N/A | 0 | Single piston engine monoplane fighter |
| PZL.56 Kania | N/A | 0 | Single piston engine monoplane fighter |
| CSS -> WSK-Okęcie -> PZL "Warszawa-Okęcie" | |||
| CSS-10 | 1948 | 2 | Single piston engine monoplane trainer[13] |
| CSS-11 | 1948 | 2 | Single piston engine monoplane trainer[14] |
| CSS-13 | 1948 | ~500 | License built single piston engine biplane utility airplane |
| LWD Junak | 1948 | 252 | Single piston engine monoplane trainer |
| CSS-12 | 1950 | 1 | Two piston engine monoplane airliner |
| CSS S-13 | 1953 | 91 | License built single piston engine biplane utility airplane |
| WSK Jak-12 | 1,191 | License built single piston engine monoplane utility airplane | |
| PZL-101 Gawron | 1958 | 325 | Single piston engine monoplane utility airplane |
| PZL-102 Kos | 1958 | 10 | Single piston engine monoplane sport airplane |
| PZL MD-12 | 1959 | 3 | Four piston engine monoplane airliner |
| PZL-104 Wilga | 1962 | 1,000+ | Single piston engine monoplane utility airplane |
| PZL-105 Flaming | 1989 | 2 | Single piston engine monoplane utility airplane |
| PZL-106 Kruk | 1973 | 275+ | Single piston engine monoplane agricultural airplane |
| PZL-110 Koliber | 1978 | Single piston engine monoplane sport airplane | |
| PZL-112 Junior | 2000 | 1 | Single piston engine monoplane trainer |
| PZL-130 Orlik | 1984 | 59 | Single turboprop engine monoplane trainer |
| PZL-126 Mrowka | 1990 | 2 | Single piston engine monoplane agricultural airplane |
| PZL-230 Skorpion | N/A | 0 | Two jet engine monoplane attack airplane |
| WSK-Mielec -> PZL-Mielec | |||
| PZL Szpak-4T | 1948 | 10 | Single piston engine monoplane utility airplane |
| PZL S-1 | 1945 | 1 | Single piston engine monoplane trainer |
| PZL S-4 Kania | 1957 | 3 | Single piston engine monoplane trainer |
| PZL TS-8 Bies | 1955 | 251 | Single piston engine monoplane trainer |
| PZL M2 | 1958 | 2 | Single piston engine monoplane trainer |
| PZL M3 Pliszka | 1959 | 3 | Glider |
| PZL M7 | N/A | 0 | Two jet engine monoplane trainer[15] |
| PZL M8 Pelikan | N/A | 0 | Glider[16] |
| PZL M4 Tarpan | 1961 | 2 | Single piston engine monoplane trainer |
| PZL An-2 | 1961 | 11,000+ | License built single piston engine biplane utility airplane |
| PZL Lim-1 | 1952[17] | 227 | License built single jet engine monoplane fighter |
| PZL Lim-2 | 500 | License built single jet engine monoplane fighter | |
| PZL Lim-5 | 1956[18] | 666 | License built single jet engine monoplane fighter |
| PZL Lim-6 | 110 | License built single jet engine monoplane attack airplane | |
| PZL TS-11 Iskra | 1960 | 424 | Single jet engine monoplane trainer |
| PZL TS-16 Grot | N/A | 0 | Single jet engine monoplane trainer |
| PZL M12 | N/A | 0 | Two piston engine monoplane utility airplane[19] |
| PZL M19 | N/A | 0 | Two jet engine monoplane trainer[20] |
| PZL M14 | N/A | 0 | Single turboprop engine monoplane agricultural airplane[21] |
| PZL M15 Belphegor | 1973 | 175 | Single jet engine biplane agricultural airplane |
| PZL M16 | N/A | 0 | Two jet engine monoplane trainer[22] |
| PZL M18 Dromader | 1976 | 759 | Single piston engine monoplane agricultural airplane |
| PZL M17 | 1977 | 1 | Single piston engine monoplane utility airplane |
| PZL M20 Mewa | 1979 | 33 | Two piston engine monoplane utility airplane |
| PZL M19 | N/A | 0 | Two turboprop engine monoplane transport airplane[23] |
| PZL M21 Dromader Mini | 1982 | 2 | Single piston engine monoplane agricultural airplane[24] |
| PZL M24 Dromader Super | 1987 | 4 | Single piston engine monoplane agricultural airplane |
| PZL M25 Dromader Micro | N/A | 0 | Single piston engine monoplane agricultural airplane[24] |
| PZL M26 Iskierka | 1986 | 9 | Single piston engine monoplane trainer |
| PZL An-28 | 1984 | Two turboprop engine monoplane transport | |
| PZL M28 Skytruck | 1993 | Two turboprop engine monoplane transport | |
| PZL M30 | N/A | 0 | Single turboprop engine monoplane agricultural airplane[25] |
| PZL M32 | N/A | 0 | Two turboprop engine monoplane utility airplane[26] |
| PZL M34 | N/A | 0 | Two turboprop engine monoplane transport[27] |
| PZL I-22 Iryda | 1985 | 17 | Two jet engine monoplane trainer |
| WSK "PZL Świdnik" -> PZL-Świdnik | |||
| PZL SM-1 | 1956 | 1,594 | License built single piston engine utility helicopter |
| PZL SM-2 | 1959 | 89 | Single piston engine utility helicopter |
| PZL Mi-2 | 1965[28] | 5,400+ | License built two turboshaft engine utility helicopter |
| PZL SM-4 Łątka | N/A | 1 | Single piston engine utility helicopter |
| PZL Kania | 1979 | 19 | Two turboshaft engine utility helicopter |
| PZL W-3 Sokół | 1979 | 149 | Two turboshaft engine utility helicopter |
| PZL SW-4 Puszczyk | 1996 | 40 | Single turboshaft engine utility helicopter |
| PZL PW-5 | 1993 | Glider | |
| PZL PW-6 | 1998 | ~26 | Glider |
| PZL I-23 Manager | 1999 | 2 | Single piston engine monoplane sport airplane |
| PZL-Bielsko -> Allstar PZL Glider | |||
| SZD-50-3 Puchacz | 1979 | 333[29] | Glider double seater |
| SZD-48-3 Jantar Standard 3 | 1983 | 349[30] | Glider standard class |
| SZD-51-1 Junior | 1984 | 246[31] | Glider club class |
| SZD-59-1 Acro | 1993 | 48[32] | Glider single seater, aerobatic and utility |
| SZD-55-1 Nexus (Promyk) | 1998 | 125[33] | Glider standard class |
| SZD-54-2 Perkoz | 2010 | 30[34] | Glider double seater, aerobatic and utility |
Other types of aircraft edit
- PZL Krosno KR-03 Puchatek - glider
Engines edit
See also edit
References edit
Notes edit
- ^ a b A. Glass (1977), p. 26-31
- ^ a b A. Glass (1977), p. 41-44
- ^ Babiejczuk, J. and Grzegorzewski, J. (1974), p. 54
- ^ a b Cynk, Jerzy B. (4 January 1962). "Progress in Poland". Flight International. Vol. 81, no. 2756. pp. 14–17.
- ^ a b Babiejczuk, J. and Grzegorzewski, J. (1974), p. 11, 16
- ^ Babiejczuk, J. and Grzegorzewski, J. (1974), p. 67-72
- ^ a b c Babiejczuk, J. and Grzegorzewski, J. (1974), p. 90-98
- ^ a b Babiejczuk, J. and Grzegorzewski, J. (1974), p. 101-103
- ^ History
- ^ Allstar-e-motion
- ^ a b Babiejczuk, J. and Grzegorzewski, J. (1974), p. 132-134
- ^ "History". Pratt & Whitney. Retrieved 8 March 2021.
- ^ Luto, Krzysztof. "CSS-10, 1948". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "CSS-11, 1948". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M7 STN, 1960". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M8 "Pelikan", 1960". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "Lim-1 / Lim-2, 1952". SamolotyPolskie.pl (in Polish). Retrieved 22 March 2021.
- ^ Placha Hetman, Karol (14 October 2020). "WSK Mielec Lim-5. 2020". Polot. Retrieved 22 March 2021.
- ^ Luto, Krzysztof. "PZL M12, 1961-1963". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M19, początek lat 1970- tych". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M14, 1969-1971". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M16, 1973". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M19, 1981". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ a b Placha Hetman, Karol (21 November 2020). "PZL Mielec M-18 Dromader. 1976". Polot. Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M30, 1985". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M32, 1990". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL M34, 1996". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Luto, Krzysztof. "PZL Mi-2, 1965 (SM-3)". SamolotyPolskie.pl (in Polish). Retrieved 14 March 2021.
- ^ Polskie Szybowce SZD, Tomasz Murawski,(Warszawa 2016),ISBN 978-83-937805-6-3, p. 193
- ^ Sylwetki Szybowcow SZD, Tomasz Murawski,(2020), p. 222
- ^ Polskie Szybowce SZD, Tomasz Murawski,(Warszawa 2016),ISBN 978-83-937805-6-3, p. 218
- ^ Sylwetki Szybowcow SZD, Tomasz Murawski,(2020), p. 224
- ^ Sylwetki Szybowcow SZD, Tomasz Murawski,(2020), p. 221
- ^ Sylwetki Szybowcow SZD, Tomasz Murawski,(2020), p. 206
Bibliography edit
- Glass, Andrzej (1977). Polskie konstrukcje lotnicze 1893-1939 [Polish aviation designs 1893-1939] (in Polish). Warsaw: Wydawnictwa Komunikacji i Łączności.
- Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945–1973 [Polish aviation industry 1945-1973] (in Polish). Warsaw: Wydawnictwo MON.
- Cynk, Jerzy B. (4 January 1962). "Progress in Poland". Flight International. Vol. 81, no. 2756. pp. 14–17.
- Murawski, Tomasz (2016). Polskie Szybowce SZD [Polish SZD gliders] (in Polish). Warszawa.
{{cite book}}: CS1 maint: location missing publisher (link) - Murawski, Tomasz (2020). Sylwetki Szybowcow SZD [SZD gliders models] (in Polish).
External links edit
