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PZL P.24

The PZL P.24 is a Polish fighter aircraft, built in the late 1930s by Państwowe Zakłady Lotnicze. It was a much more advanced development of the PZL P.11, a Polish (gull) wing all-metal fighter designed by Zygmunt Puławski.

Development
Background During the early 1930s, PZL had developed a series of innovative gull wing all-metal fighters, headed by Polish aeronautical engineer Zygmunt Puławski. In order for any export sales of the type to be successfully completed, PZL had to address two major obstacles. The project was headed by Wsiewolod Jakimiuk, who had assumed the position early on after the untimely death of Puławski on 21 March 1931. During February 1932, the P.24 proposal was submitted for internal approval; this was granted two months later. The experiences with the first prototype had determined that in excess of 150 modifications to various aspects of the design, including the adoption of a long-chord NACA cowling, the reinforcement of a cannon mounting structure and the revision of the exhaust and cooling systems, were required, leading to the construction of a second prototype, known as the P.24/II. During August 1934, the third prototype conducted its first flight; two months later, it performed a demonstration outside Warsaw attended by various Polish officials and several members of foreign missions. Production During late 1934 and early 1935, the P.24/III was involved in several promotional flights, including evaluation flights held near Warsaw on behalf of visiting Turkish and Romanian military officials, as well as a demonstration tour which saw it visit neighbouring Hungary and Bulgaria. Gradually, the pre-production P.24s were modified to closely represent successive production variants of the type; this work included the installation of alternative engines, including the Gnome-Rhône 14N01, the Gnome-Rhône 14N21, the Renault 14T, and the Fiat A.80, which were freely provided by their respective manufacturers. Following the encountering of greater-than-anticipated drag on early production aircraft, various aerodynamic improvements were implemented upon the next variant of the fighter, designated as the P.24C, which made up the majority of the Turkish order. These aircraft featured various modifications, including increased endurance, customised armaments, and further aerodynamic improvements. Despite being an objectively superior fighter to its P.11 predecessor, no P.24s were ever acquired by the Polish Air Force, which preferred to wait for the more advanced PZL.50. Despite numerous rumours claiming such, there were no PZL.24s in use by the Polish defenders during the Polish Campaign; these rumours may have been a result of the common misidentification of the P.11 as being the later P.24 by German spotters. As late as 1939, further improvements of the P.24 were being studied. ==Design==
Design
The PZL P.24 was a gull wing all-metal fighter aircraft that drew extensively on the design of the earlier P.11, being essentially a more powerful and export-friendly version of it. The armament was a combination of 20 mm Oerlikon FF cannon and 7.92 mm Colt-Browning machine guns in the wings. On the P.24A, P.24E and P.24F models, it was armed with a pair of cannon and a pair of machine guns, while the P.24B, P.24C and P.24G variants were armed with an arrangement of four machine guns. Fuel was housed with an internal 360 litre tank located within the fuselage; in case of fire or similar emergency situations, this tank could be jettisoned. On all production P.24s, the canopy was fully enclosed; according to Cynk, it provided pilots with exceptionally high levels of external visibility in comparison to other fighter aircraft of the era. The pilot's seat was adjustable and could accommodate either a back or seat-type parachute; it was normally equipped with a Borkowski self-adjusting safety belt system. ==Operational history==
Operational history
Greece The Royal Hellenic Air Force (EVA) was the only air force during the Second World War to operate the PZL.24 as its main fighter type. Two different subtypes, consisting of 30 P.24F and six P.24G, were ordered and delivered between 1937 and 1938 (an agreement for licence production by KEA was signed, but due to the outbreak of the war, construction in Greece of only one P.24F is documented). Upon arrival, these were split between three Mirae Dioxeos (Fighter Squadrons): the 21st at Trikala, 22nd at Thessaloniki and 23rd at Larissa. The only other operational Greek fighters, stationed further south, were eight Bloch MB.151s and two each Gloster Gladiator Mk Is and Avia B-534 II, both of which were of limited value. During October 1940, the month in which Italy launched its invasion of Greece, the Polish fighter was the Greeks' only modern type in adequate numbers. However, by 1940, the P.24 was no longer a front-runner, despite its use of a powerful powerplant and a satisfactory armament; the P.24 had no speed advantage over the Fiat CR.42, nor could it outfly the nimble Italian biplane, while it was considerably slower than the Macchi MC.200 and the Fiat G.50 it was often pitted against. Its armament was the only real advantage against the Italian fighters, whose reliance on the slow-firing Breda-SAFAT 12.7mm machine guns proved detrimental. The P.24F, armed with a pair of 20mm Oerlikon FF cannon and two machine guns, gave the Greeks a temporary edge in combat until lack of ammunition and spares forced EVA to re-arm all P.24Fs with four Colt–Browning 7.7 mm MG40 machine guns. Overall, the P.24s performed gallantly during the early period of the conflict, holding their own against impossible numerical odds and despite the fact that their main target were enemy bombers, which forced them to fight at a disadvantage against enemy fighters. Italian claims of easy superiority over the Albanian front were vastly exaggerated and their kill claims even exceeded the total number of operational fighters on the Greek side. In total, Greek fighter losses in combat came to 24 aircraft, while the Greek fighter pilots claimed to have achieved 64 confirmed kills and 24 probables, around two-thirds of which were bombers). By April 1941, however, lack of spares and attrition had forced EVA to merge the five surviving P.24s into one understrength squadron, which was supported by five Gloster Gladiator Mk I and II's and the two surviving MB.151s. That month, these remaining fighters fought hopelessly against the Luftwaffe onslaught, scoring 4 kills (two Hs 126, one Ju 87B and one Do 17) while losing most of their surviving aircraft on the ground. None of the Puławski fighters are believed to have survived the conflict. Romania Prior to its procurement of the P.24, the Romanian Air Force had already adopted the P.11F, which was manufactured under licence by Industria Aeronautică Română (IAR) in Romania. The Romanian Air Force acquired a production licence for the type along with an initial batch of six Polish-built P.24Es, which served as pattern aircraft. The P.24E was specifically designed in conform with the requirements set out by the Romanian Air Force, including compatibility with its IAR-built model of the 14K engine, its two-cannon and two-machine gun armament, and various refinements and aerodynamic improvements. According to Cynk, the P.24E had played a significant role in the development of a new Romanian low-wing monoplane fighter, which was designated as the IAR 80. Specifically, the new fighter had adopted a fuselage which had been derived from the P.24, along with a nearly-identical tail section, which was paired up to a new cantilever wing and an inwardly-retractable undercarriage. The P.24E was also routinely used for ground attack missions until the end of 1941; however, after 1942, the type was relegated to training duties because of its obsolescence in the face of improved opposition fighter aircraft. ==Variants==
Variants
During the development of Puławski fighters, a new version of the P.11, the P.11c, was developed for the Polish Air Force. It had a new, reconfigured fuselage, and the radial engine was lowered to give a pilot a better view. These changes were also applied to the new P.24 prototype, flown in 1936. The P.24A and P.24B models could carry 4 x 12.5 kg bombs, while the P.24C, F and G could carry 2 x 50 kg bombs. ;P.24/I :First prototype, powered with a Gnome-Rhône 14Kds engine (760 hp), armed with two 7,92 mm Vickers wz. E machine guns. ;P.24/II Super P.24 :Second prototype, powered with a Gnome-Rhône 14Kds engine from P.24/I initially, later with Gnome-Rhône 14Kfs engine (930 hp), armed with two 20 mm Oerlikon F guns and two 7,92 mm Vickers wz. E machine guns. ;P.24/III Super P.24 bis :Third prototype, powered with a Gnome-Rhône 14Kfs, armed with two 20 mm Oerlikon FFS guns and two 7,92 mm Vickers wz. E machine guns. ;P.24A :Armed like P.24/III. ;P.24B :The P.24B version was armed with four machine guns. ;P.24C :The P.24C was armed with four machine guns and two 50 kg bombs. ;P.24D :The P.24D was developed for sale to Hungary, but it was not completed, with Hungary purchasing the Fiat CR.32 instead. ;P.24E :The P.24E version was licence-built in Romania by Industria Aeronautică Română as the IAR P.24E. ;P.24F :The P.24F was armed with two cannon and two machine guns and bombs and powered with the more powerful Gnome-Rhône 14N-07 engine. ;P.24G :The last production version was the P.24G, produced from 1937 and powered with the Gnome-Rhône 14N-07 engine. The P.24G was armed with four machine guns and bombs. ;P.24H :The P.24H was to be powered with a Gnome-Rhône 14N-21 engine (1,100 hp) and carry four cannon or two cannon and two machine guns, but it was not completed. The P.24H was considered for purchase by the Polish Air Force, but progress was slow due to the P.24's similarity to the PZL P.11, which was already in service, and interest in the hypothetically superior PZL.50 Jastrząb then under development. World War II started before any of these plans could be realised. ;P.24J :The P.24J version was to be armed with four cannons and was to be sold for export. ==Operators==
Operators
; • Bulgarian Air Force ordered 14 PZL P.24B fighters in 1936, delivered 1937–1938. Bulgaria placed a repeat order for 20 PZL P.24C, to be delivered by the end of 1938. It later ordered 26 PZL P.24Fs, 22 of which were delivered from Poland in July 1939, just before the outbreak of World War II. The remaining four, lacking propellers, were bombed in the Okęcie factory in September 1939 by the Germans. The total order was 56 PZL P.24B/C/F. ; • Royal Hellenic Air Force ordered 12 P.24F and 24 P.24G fighters in 1936, delivered 1937–1938. Due to difficulties in obtaining ammunition for 20mm autocannons during the war, all F version planes were eventually rearmed with 4x Colt–Browning 7.7mm MGs. ; • Royal Romanian Air Force ordered 5 PZL P.24E fighters in 1937, acquired a production licence and built 25 E version aircraft in Romania under the local designation IAR P.24P. ; • Turkish Air Force ordered 14 P.24A and 26 P.24C, delivered by 1937. Another 20 P.24A/Cs were built under licence in 1939 in Turkey at the Kayseri Aircraft Factory (Turkish: Kayseri Tayyare Fabrikası), followed by further 30 P.24G aircraft. ==Surviving aircraft==
Surviving aircraft
The only surviving example of a PZL P.24 in the world is an example in Turkey. Photographs of the Turkish museum piece show a variety of serial numbering (2015, 2017, 2145, 2147) and are shot at different locations: (Ankara and Istanbul), but original aircraft is mistaken with one full-scale fiberglass replica. ==Specifications (P.24A, P.24B, P.24C)==
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