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Fiat G.50 in Croatian Air Force Service

A Croatian air force Fiat G.50 in 1944.

 In October 1941, the Croatian Air Force Legion requested military aid from Italy, that country agreed to deliver 10 Fiat G.50s (nine single-seaters and one two-seater), along with ancillary equipment. On 12 June 1942, the Fiat G.50 bis fighters took off from Fiat Aviazione in Turin for Croatia, but before they reached the border, they were stopped on the orders of Ugo Cavallero, Chief of the Italian Supreme Command, who feared that the Croatian pilots would defect. The G.50s had to wait until 25 June before being delivered to the Croatian Air Force, which assigned them to the 16th Jato at Banja Luka and were intensively used until 1945 against Yugoslav Partisans, at first in Bosnia and Herzegovina, then in Serbia, Croatia and Dalmatia. During 1942, a Croatian G.50 bis squadron was transferred from Northern Yugoslavia to the Ukrainian front, flanking the 4th Luftflotte.

On 25 June 1943, the Zrakoplovstvo Nezavisne Drzave Hrvatske (Air Force of the Independent State of Croatia, or ZNDH), received nine G.50 bis fighters and one G.50B. In October, while based at Zalužani airfield, Banja Luka, they flew many strafing missions against partisans for nearly a year.

After the Italian armistice of 8 September 1943, the Luftwaffe supplied the Croatian Air Force Legion with 20–25 Fiat G.50s captured on Regia Aeronautica airfields in the Balkans. These equipped two Croatian fighter units, but by the end of 1943 only 10 aircraft remained. Three G.50s captured after the Armistice were loaned to Kro JGr 1 at the beginning of 1944. In 1944 some of the G.50s were operated at the Brezice training school. ZNDH entered 1945 with seven G.50s (two operational). On 10 March 1945 six of these Fiats were based in Lucko, operated by 2.LJ (Lovacka Grupa, Fighter Group). Three were damaged by RAF Mustangs of Nos 213 and 249 Squadrons attacking Lucko airfield with napalm bombs, on 25 March, and the following day one of the last operative Freccia was flown to a RAF-held airfield by vodnik (Corporal) Ivan Misulin that defected, together with vodnik Korhut (flying a Bf 109 G-10). The last G.50s were captured by Yugoslav Partisans. After the war, the G.50s were used for some time by the newly formed Yugoslav Air Force – the last G.50s on active service.

 

Junkers F 13 in Finnish Air Force Service

Junkers F 13 courier and ambulance aircraft at Tiiksjärvi airfield, Finland. The aircraft performed valuable service during the winter storm in the spring of 1942. The photo shows a Junkers F 13, registration JU-120. A chute has been installed on the right wing to facilitate unloading. 21 May 1942.

 

Elmira New York Glider Meet in 1937: German Sailpanes Compete at International Glider Contest

 

Photographs of the International Glider Meet at Elmira, New York in July 1937. Various gliders are shown on the ground, mostly German sailplanes. Probably taken at the Eighth Annual National Soaring Contest, held June 26 to July 11, 1937, at Elmira, New York. Central aircraft is Schleicher Sperber Senior (D4-502), which was flown by Peter Riedel during the contest.

Glider flying is still very much active at the same location in Elmira, New York. On August 20, 2018, my wife, Mary and I, visited the site, which has a large museum with a collection of actual gliders as well as models of most if not all American gliders, civilian and military. They have the fuselage of a Waco CG-4A cargo glider among other items depicting World War II gliders and operations. 

Ray Merriam


Messerschmitt Me 209: German Racing Aircraft

Circa 1940:  The German Messerschmitt Me 209 V4 (D-IRND, later CE+BW) with fake military markings that had been applied for propaganda purposes. The Me 209 V4 was a failed attempt to introduce to service a new and improved fighter aircraft that would potentially replace the Bf 109. It was not requested by the RLM but was instead Messerschmitt’s own private venture.

The first Messerschmitt Me 209 was a single-engine racing aircraft designed and produced by the German aircraft manufacturer Messerschmitt. It successfully established several new speed records.

The design work on what was originally designated P.1059 commenced in 1937; the Me 209 was a completely original aircraft whose sole purpose was to set new international speed records. As originally built, it has a relatively compact airframe, incorporated a steam cooling system, a unique cross-shaped tail section, and lacked any armaments. On 1 August 1938, Me 209 V1 conducted its maiden flight; a further three prototypes would be completed by May 1939. On 26 April 1939, this same aircraft established a new international speed record of almost 756 km/h (469 mph); this record was not officially broken by another piston-engined aircraft until 16 August 1969.

In addition to the Me 209 designation, the type was also assigned the Me 109R designation for propaganda purposes as part of an effort to conflate the aircraft with the Messerschmitt Bf 109, the Luftwaffe's primary fighter throughout the Second World War; it was hoped that the Me 109R designation would cause its accomplishments to be associated or confused with the Bf 109. Despite using the same Daimler-Benz DB 601 inline engine, the Me 209 and Bf 109 had little in common with one another. Messerschmitt undertook some work to adapt the Me 209 into a combat-capable fighter, but it proved to be inferior to the existing Bf 109 in this role, and this was never produced in quantity. The Me 209 designation was subsequently reused for a wholly separate aircraft that was the proposed successor to the Bf 109.

Throughout much of the 1930s, various high-ranking officials within Germany advocated for the demonstration of supposed German superiority, particularly in the aviation sector, which benefited greatly from state backing in the form of numerous development and production contracts. Some of these contracts were aimed at boosting national prestige as well as advancing Germany's aeronautical capabilities, such as the establishment of new international aviation records. It was within these active trends that the aircraft manufacturer Messerschmitt embarked on the P.1059, a clean-sheet aircraft designed solely to perform high speed flights with the specific object of setting a new absolute speed record.

During 1937, design work formally commenced, headed by the German aeronautical engineer Willy Messerschmitt. Prior to the year's end, the construction of three prototypes had commenced, by which point the aircraft had been officially designated as the Me 209.

In terms of its basic configuration, the Me 209 was a compact low-wing monoplane that was designed around a specially-produced model of the Daimler-Benz DB 601 inline engine (early flights were performed with conventional models of the DB 601). While this engine produced up to 1,800 hp under most circumstances, it could be temporarily boosted to 2,300 hp in limited bursts for additional acceleration. While the Me 209 did share a few elements, such as the DB 601 engine, with the Messerschmitt Bf 109 fighter aircraft, it was a completely separate aircraft and had many differences. One of the more atypical feature of the Me 209 was its use of a steam cooling system, which facilitated the elimination of traditional radiator-based cooling and the resulting aerodynamic drag incurred. This system involved stored water being piped through the engine, where it absorbed heat, after which it traveled to the wings where it was cooled down before being circulated around again. Due to the constant loss of water (between 4.5 liters and 7 liters per minute), the engine could only be ran for up to 30 minutes at a time.

Considerable efforts were made into minimizing the equipment fitted as well as having the airframe be as small as was feasibly possible. The cockpit of the Me 209 was positioned relatively rearwards in relation to the fuselage, just forward of its unique cross-shaped tail section. Both the tailplane and elevators had a relatively small area while the fin featured a substantial ventral section. The wing's design, which aimed to minimize the wing area, resulted in relatively high wing loading of the era. While these aspects favored the Me 209's speed capabilities, they also increased the pilot's difficulty in flying it.

Unlike the Bf 109, the Me 209 featured a wide track, inwardly-retracting undercarriage that was mounted in the wing section. There was seemingly little consideration given towards its potential use in combat. 

On 1 August 1938, the first prototype, Me 209 V1, performed its maiden flight, piloted by chief test pilot J. H. Wurster. Early observations included the flight controls being heavy and unwieldy, the aircraft's general instability, and an undesirable tendency for it to nose down without warning or provocation. Another negative flight characteristic was its relatively high sink rate during landing approaches, contributing to a typically heavy landing, during with the aircraft could easily and inadvertently swerve. Me 209 V2 made its first flight on 8 February 1939, but was lost in a non-fatal accident two months later that was attributed to a seized engine.

The Me 209 achieved its primary purpose when, on 26 April 1939, a new world speed record of almost 756 km/h (469 mph) was set by the first aircraft, bearing the German civil registration D-INJR and flown by test pilot Fritz Wendel. This record was not officially broken by another piston-engined aircraft until 16 August 1969 by Darryl Greenamyer's highly modified Conquest I F8F Bearcat, The absolute speed record set by the Me 209 V1 stood until October 1941, at which point it was broken by another Messerschmitt aircraft, the Me 163A V4 rocket fighter prototype, flown by Heini Dittmar, which attained a speed of 1,004 km/h (624 mph).

By the end of May 1939, both Me 209 V3 and Me 209 V4 entered flight testing. Largely due to the upcoming outbreak of the Second World War, any thought of international speed records had been set aside in favor of their use as experimental aircraft. The fourth prototype has been alleged to be involved in efforts to convert Me 209 into a fighter aircraft.

The idea of adapting the Me 209 to perform the fighter role gained momentum when, during the Battle of Britain, the Bf 109 failed to gain superiority over the Royal Air Force's fighters, such as the Supermarine Spitfire. Key changes made to the aircraft included the installation of a standard DB 601 engine, a new wing and automatic leading edge slots; efforts were made to improve the Me 209's challenging flight and landing characteristics. Armaments were envisioned to be installed in several locations, including the wing, upper nose, and within the propeller shaft.

Despite the efforts made, the Me 209 was not up to the task of aerial combat. Its wings were almost completely occupied by the engine's liquid cooling system and therefore prohibited the conventional installation of armament. The aircraft also proved to be relatively difficult to fly and extremely hard to control while on the ground. Nevertheless, Messerschmitt's design team made several attempts to improve the aircraft's performance, such as through the adoption of longer wings, a taller vertical stabilizer, and installing a pair of synchronized 7.92 mm (.312 in) MG 17 machine guns in the engine cowling. Its various modifications, however, added so much weight that the Me 209 ended up slower than the contemporary Bf 109E. In light of this disappointing performance, the conversion project was promptly abandoned in favor of other efforts.

The Me 209's designation was used by Messerschmitt as a propaganda tool. Although the aircraft was a "single purpose" high-speed experimental prototype, it was hoped that its designation would associate it and its world-beating performance with the Bf 109 already in combat service.

During 1939, the speed record achievement of the Me 209 was used for a propaganda disinformation campaign, wherein the aircraft (possibly from its post-July 1938 first flight date) was given the designation Me 109R, with the later prefix, never used for wartime Bf 109 fighters. This disinformation was naturally designed to give an aura of invincibility to the Bf 109, which was not dispelled until the conclusion of the Battle of Britain.

The fuselage of the Me 209 V1 is currently on display, at the Polish Aviation Museum in Kraków, Poland and was once a part of Hermann Göring's personal collection.

Bibliography

 

Green, William (1960). War Planes of the Second World War, Fighters, vol. I. London, UK: Hanover House.

 

Lepage, Jean-Denis G.G. (2009). Aircraft of the Luftwaffe, 1935-1945: An Illustrated Guide. Jefferson, North Carolina: McFarland & Company.

 

Matthews, Birch (2001). Race with the Wind: How Air Racing Advanced Aviation. Zenith Imprint.

 

Nowarra, Heinz J. (1993). Die Deutsche Luftrüstung 1933–1945: Band 3 Flugzeugtypen Henschel - Messerschmitt (in German). Bonn, Germany: Bernard & Graefe Verlag.

 

Smith, John Richard; Kay, Antony L. (1972). German Aircraft of the Second World War. London, UK: Putnam.

 

Stüwe, Botho (1999). Peenemünde West (in German). Augsburg, Bavaria, Germany: Bechtermünz Verlag.

 

Further Reading

 

Feist, Uwe (1993). The Fighting Me 109. London, UK: Arms and Armour Press.

 

Jackson, Robert (2005). Infamous Aircraft: Dangerous Designs and their Vices. Barnsley, Yorkshire, UK: Pen and Sword Aviation.

 

Kulikov, Victor (March 2000). "Des occasions en or pour Staline, ou les avions allemands en URSS" [Golden Opportunities for Stalin, or German Aircraft in the USSR]. Avions: Toute l'Aéronautique et son histoire (in French) (84): 16–23.

 

Kulikov, Victor (April 2000). "Des occasions en or pour Staline, ou les avions allemands en URSS". Avions: Toute l'Aéronautique et son histoire (in French) (85): 44–49.


 Messerschmitt Me 209 V1.

 Messerschmitt Me 209 V1.

Messerschmitt Me 209 V4.

Messerschmitt Me 209 V1 serial number 1185 civil registration D-INJR.

Messerschmitt Me 209 1:2 scale model in the Luftfahrt Museum in Hannover.

Messerschmitt Me 209 V1 at the Polish Aviation Museum. As far as significant airframes go, this machine is near the top of the list. It is the record-breaking Messerschmitt Me 209 V-1 (c/n 1185), which held the world air speed record from 1939 till 1941, and for a piston engined aircraft from 1939 till 1969. During the war it became part of Hermann Göring's personal collection. The fuselage is now displayed in a building full of unrestored relics at the Muzeum Lotnictwa Polskiego. Krakow, Poland. Photo taken 23 August 2013.

Messerschmitt 209 [Bf 109R] aircraft setting the World's Speed Record on April 26, 1939: 468.9 m.p.h. Pilot: Flug Kapitan Fritz Wendel.

Willy Messerschmitt (left) congratulates Flugkapitñ Fritz Wendel (Messerschmitt's chief test pilot) as he climbs from the cockpit of Messerschmitt Me 209 V1 (D-INJR) after Wendel set an absolute speed record of 469.22 mph (755.138 km/hr), Germany, April 26, 1939.

The Me 209 mock-up in its early development stage. Most evident is the unusually rear-positioned pilot cockpit.

The Me 209 cockpit canopy opens outwards to the right (seen on the V3). This design had a flaw as it could not be left open during takeoff or landing. In an emergency, the canopy could be jettisoned.

The Me 209 was to be powered by a DB 601ARJ engine which used a Messerschmitt P8 three-bladed propeller.

The Me 209V1 just prior to being allocated to the Berlin Air Museum in April 1940. The pilot is Fritz Wendler, and next to him it is Willy Messerschmitt.


Messerschmitt Me 209.

Messerschmitt Me 209 V4.

The Me 209 mock-up in its early development stage. Most evident is the unusually rear-positioned pilot cockpit.

Messerschmitt Me 209 V2 with civilian registration D-IWAH.

Messerschmitt Me 209 V4 with civilian registration D-IRND.

Messerschmitt Me 209 V4 with civilian registration D-IRND.

Messerschmitt Me 209 V4 with civilian registration D-IRND. On the left is a view of the engine compartment with the two machine guns mounted. On the right is a view of the pilot's cockpit.

Messerschmitt Me 209 V4 with fake military markings.

Messerschmitt Me 209 V1.

FuG 200 Hohentwiel: German Luftwaffe Maritime Patrol Radar System

Focke-Wulf Fw 200C with triple radar antenna arrays for its FuG 200 installation. July 1943.

The FuG 200 Hohentwiel was a low-UHF band frequency maritime patrol radar system of the Luftwaffe in World War II. It was developed by C. Lorenz AG of Berlin starting in 1938 under the code name "Hohentwiel", an extinct volcano in the region of Baden-Württemberg in southern Germany.

Originally developed as an anti-aircraft radar for the Luftwaffe, it lost out to the Würzburg for this role. In 1941, it was modified as an airborne surface search radar for naval patrol aircraft like the Focke-Wulf Fw 200. In 1944 it was further adapted for shipborne use, used on late-war U-boats, some surface ships, and land-based installations. 

The device had originally been entered into a design contest held by the Luftwaffe for the new FuMG 40L (ground-based fire-control radar). When competitor Telefunken won that contract with its "Würzburg radar" in 1939, the device was shelved.

In 1941, Lorenz started to re-design it for another design contest by the Reichsluftfahrtministerium for an airborne naval search radar. As no specific antenna had been specified, initially the simplest possible layout with three transversely-arranged antenna arrays was chosen - the central one for transmitting and two others for receiving, one each to port and starboard of the central transmitting array. Each antenna array possessed sixteen horizontally-oriented dipole elements, in eight sets of two elements each, with each set of four dipole groups vertically stacked comprising each array. To determine which side a target lay on, the radio operator had to manually switch the receiving arrays to find the stronger signal. Later, the device received a motor-driven antenna switch. The received signal strength was displayed on a cathode ray tube so the observer or pilot could roughly gauge the target's heading as 'left', 'right' or 'head on'. The maximum range was 150 km for convoys on the Atlantic. The device was first deployed on Junkers Ju 88, Focke-Wulf Fw 200 and other maritime patrol aircraft and twin-engined torpedo bomber designs, and is known to have been fitted to Heinkel He 111 medium bombers for training purposes, and experimented with on the Heinkel He 177A. In order to avoid capture after a crash, it was fitted with several small self-destruct explosive charges in each of the system's electronics cabinets, which could be triggered by the pilot. 

In 1943, Lorenz was instructed to adapt Hohentwiel for naval use, and soon the Hohentwiel appeared on U-boats, small surface ships, and coastal installations.

There are two U-boat versions of the FuG 200 Hohentwiel used during World War II; FuMO 61 Hohentwiel U and the FuMO 65 Hohentwiel U1. The U-boat versions were easier to maintain and more reliable compared with the other versions. However, the U-boat versions had several disadvantages: the smaller antenna and the height of the antenna. The antenna was smaller as it had to fit within a small area on the port side of the conning tower. In addition, the reduced height of the antenna installation impaired the range. Both U-boat versions had ranges of between 8 and 10 kilometers (5.0 and 6.2 mi) for naval targets and between 15 and 25 kilometers (9.3 and 15.5 mi) at an altitude of 200 meters (660 ft). Resolution was about 3 degrees, and at short range its range accuracy was 100 meters (330 ft). Both U-boat versions operated at a frequency 556 MHz and had four rows of six dipoles. Before the U-boat could dive, the antenna needed to be retracted into a well on the conning tower. Both U-boat antenna versions were 1,400 mm (4 ft 7 in) wide by 1,000 mm (3 ft 3 in) in height, and total overall dimensions of the antenna frame was 1,540 by 1,022 mm (5 ft 0.6 in by 3 ft 4.2 in).

There are two types of radar transmitter for the FuMO-61 Hohentwiel U and FuMO-65 Hohentwiel U1, the Type F431 C1 and the Type F432 D2. The Type F431 C1 was used on the Type VII, Type IX and the Type F432 D2 on the Type XXI. 

FuMO 61 Hohentwiel U: The FuMO 61 Hohentwiel U was the marine version of the FuG 200 Hohentwiel used by the Kriegsmarine on Type VII, Type IX and Type XXI U-boats. Beginning March 1944, it began to be installed on Type VII and Type IX. 

FuMO 63 Hohentwiel K: The FuMO 63 Hohentwiel K became available at the beginning of 1944. It was fitted to the foremast and mainmast of surface warships.

FuMO 65 Hohentwiel U1: The FuMO 65 Hohentwiel U1 was the marine version of the FuG 200 Hohentwiel used by the Kriegsmarine only on Type XXI U-boats. The FuMO 65 Hohentwiel U1 had an updated radar display over the older FuMO 61 Hohentwiel U, it had a Plan position indicator display, known to the Germans as Drauf. 

Literature

G. Müller: Funkmessgeräte-Entwicklung bei C. Lorenz AG, 1935–1945. Internal archive volume of the SEL company, 2. expanded edition, December 1981

RLM Werkschrift 4108, Bordfunkmessgerät FuG 200. Geheime Kommandosache, August 1943

RLM Vorschrift Nr. 75/790, Prüffibel für Bordfunkmessgerät FuG 200. October 1944

RLM Luftfahrtsröhren Ringbuch, Daten und Richtlinien über die Verwendung von Luftfahrtsröhren. January 1945

K. Steimel: Bericht über den Zustand der Röhrentechnik in Deutschland zum Abschluss des Krieges. August 1945

U.S. Air Materiel Command Dayton OH, Summary Report No. F-SU-1109-ND, The High Frequency War – A survey of German Electronic War. 10 May 1946

CIOS Final Report 1746, German development of modulator valves for radar applications

CIOS report XXX-36, Physikalisch-Technische Reichsanstalt. June 1945

CIOS Report XXVII-46, Design of Radar Test Equipment at Siemens-Halske Munich

BIOS Report 1228, HF Instruments & Measuring Techniques

Achievement in Radio, Radio Science, Technology, Standards and Measurements at the National Bureau of Standards. US Department of Commerce, October 1986

Gerhard Megla: Dezimeterwellentechnik. Fachbuchverlag Leipzig, 1952 (Chapter on measuring devices and measuring methods in the decimeter range of wavelengths)

Radio Measurements, Proceedings of the IEEE, Volume 55, June 1967. Hewlett Packard, Microwave *Measurement Handbook, Chapter RF Peak Power Measurement, Procedures and Equipments

Boonton Electronics Company, Application Note AN-50, Measuring the Peak Power

U.S. Naval Research Laboratory, ASB Radar Alignment Procedure. November 1942

Radar Transmitter Type F431 C1: The FuMO 61 Hohentwiel antenna was 1,400 mm wide and a height of 1,000 mm, though it had an overall width of 1, 540 mm and a height of 1,022 mm. The mesh size is approximately 15 mm.

Radar Transmitter Type F432 D2: The FuMO 61 Hohentwiel antenna was 1,400 mm wide and a height of 1,000 mm, though it had an overall width of 1, 540 mm and a height of 1,022 mm. The mesh size is approximately 15 mm.

Front cover of Luftwaffe manual with full technical specification.

First page of three in the chapter on the FuG 200 (Hohentwiel) ASV and Navigational Radar in TM E 11-219 "Directory of German Radar Equipment" (a US War department publication), 20 April 1945.

Submarine version FuMO 61 "Hohentwiel" antenna and FuMO Ant.3 "Bali" on board U-3008, a Type XXI U-Boat, June 1945.

Same boat seen from further aft.

FuMO 61 antenna on U-Boat.

FuMO 61 antennas on the U-Boats shored in Lisahally, at the end of June 1945. From right to left, in the first row: U-1109, U-1058, U-278, U-901, behind U-293, U-826, U-1105, U-1022 and U-2326.

Arrangement of FuMO 61 radar set in the radio room of a type IXC U-Boat.

Arrangement of FuMO 61 radar set onboard U-515 – showing the driving shaft of the antenna .

Transmitter (at right, top) and receiver (below) of FuMO 61 radar set in the radio room of U-889.

Imaging module (at left, top) of FuMO 61 radar set and hand wheel for rotating antenna (below) in the radio room of U-889.

Receiver, imaging module and transmitter of FuMO 61 radar set.

Imaging module of FuMO 61 radar set (most likely from U-234).

Oscilloscope, Radar, German, FuG 200 Component, SG 200. Imaging module of FuMO 61 radar set.

Type A display of the FuMO 61 radar set.

FuMO 65 antenna on the type XXI U-Boat.

Receiver, Radar, German, FuG 200 component, E-200, LN28892.