Del BF 109 furono progettate altre versioni (Alcune sono delle interpretazioni ed evoluzioni da considerarsi modelli a parte) delle quali solo alcune videro concretizzarsi in un prototipo o poco più. (Verranno presentati solo alcuni dei molteplici progetti sperimentali )
Bf 109Z "Zwilling"
This experimental aircraft was essentially two Bf 109F airframes (together with outer wing panels) joined together by means of a new wing, and new tail section, in a manner paralleled by the F-82 Twin Mustang. Two variants of this aircraft were proposed, one an interceptor armed with five 30 mm cannons, the other a fighter-bomber with a 1,000 kg bomb load. Only one Bf 109Z was built, and it was never flown, having been damaged in an Allied bombing raid while in hangar and the project was permanently abandoned in 1944.

Me 209 (Nelle foto Me-209 V-1 & Me-209 V5)
If someone talks about "Me 209" he has to differ between the, record planes "V-1" to "V-3" and later models.
The "Me 209" was constructed as record plane in 1937. It looked quite different from the "Bf 109". The fuselage was more sturdy, the pilots seat was positioned directly in front of the vertical fin, which continued below the fuselage as tail spur. Also the undercarriage was not fitted to the fuselage, like the "Bf 109", but fitted broad-gauged under the wings. To reduce the airresistance, the whole wing was constructed to contain the liquid-cooling of the engine. "V-1" to "V-3" were total identicaly.
On April, 26´th 1939 chief-testpilot Fritz Wendel sat a new world speed record with 755,138 km/h. Because of propaganda, the entry into FIA recordlist was made under the name "Bf 109 R".
In 1940, when it became obvious, that the "Bf 109" was not as superior to the "Spitfire" as thought by the RLM, it was decided to reconstruct the "Me 209" to a fighterplane. It showed, that there was no place to mount heavy armament, because the wings were required for cooling. Also the plane was difficult to fly. When it was tried to solve this problems, it became obvious, that this "Me 209" wouldn´t be better than the actual "Bf 109". So the project was stopped.
In 1943, when Kurt Tank worked on his "Ta 152", Messerschmitt facilities remembered again the "Me 209" and it was planned to construct a competition design to the "Ta 152". So the "Me 209 V-4" was completly reconstructed. The only parts remembering to the predesessors of the developing "V-5" were the wings. The fuselage on the other side was a total new construction. As engine then used the Daimler-Benz "DB 603" in-line engine with ring cooling. In April 1944 the prototype started testing. Because the "Ta 152" already was in serial production, further tests were canceled.
Bf 109 V-21
For an experiment and to get the first basically datas about installing a twin radial engine in the "Bf 109", the RLM instructed the Messerschmitt construction team, to fit the american Pratt&Whitney "Twin Wasp" twin radial engine to a "Bf 109 E". This engine was chosen, because there was still no german twin radial engine. The plane with the serial number 1770 was called "V-21" and got the marking "D-IFKQ". Later, after transfered to DSF, it got the military marking KB + II. It was only used for test and measure flights.
Bf 109 X
Similar to "Bf 109 V-21" the "Bf 109 X" was an experimental plane, to test the installation of the "BMW 801" twin radial engine. As experimental plane was used a "Bf 109 F", which got the mark "D-ITXP". For the installation of the big engine some changeings were necessary. So the canopy and the cross section of the fuselage were increased, the wingspan was reduced from 9,92 m to 9,33 m. Also the wing tips were angulary, like them of "Bf 109 E".
At September, 2´nd 1940, this plane started for the first flight. Until end of 1941 some more test flights were made. The test pilots made the experience, that the handling for nosediving was better than wthat with the in-line engine. But the BMW engine had some problems and lost very much oil.
After the Focke-Wulf "Fw 190" entered duty with the "BMW 801 A" engine the project "Bf 109 X" was cancelled. The plane was laid up at beginning of 1942.
Me 309
1941/42 Messerschmitt started the construction of a single-seat dayfighter, as competition for the Focke-Wulf "Fw 190 D-9". The most obvious change was the useage of a nose wheel. When they started testing on July the 18´th 1942, the prototype "Me 309 V-1" was powered with a "DB 603" engine with 1720 hp and was armed with two MG 131 above the engine and one further MG 131 and one MG 151/20 in each wing.
Later it was planned to use this design as well as fighter, fighter-bomber and destroyer.
As "Me 609" it was also planned to combine two "Me 309" to one twin plane, like "Bf 109 Z". This would have meant the same changeings, described at "Bf 109 Z".
Bf 109 TL
Because some leaders in RLM feared, that the new developed jetfighter "Me 262" would at first have some difficulties, it was planned to install the new jet-engines in a plane, as fast as possible. So it was also examined to reconstruct the "Bf 109" in a way, that it could get two of this jet-engines, and so would make an interim solution, until the expected problems of "Me 262" would be solved. This idea came up first in January 1943. It was planned to take the fuselage of the "Me 155" (a figther-bomber, based on "Bf 109"), the undercarriage of the projected "Me 309" and the wings of the also planned "Me 409".
Already two months later it was recognized, that it was not so easy, to combine this components to get an useful plane. This difficulties were so hard to solve, that this project soon was canceled.
Anche il BF 109 come lo Spitfire vide una produzione (Se pur minima) postbellica, da segnalare in merito i seguenti modelli:
Avia S.199
The Avia S.199 was a Czech version of the Messerschmitt Bf 109G-14 manufactured at previously German-controlled factories from the Messerschmitt blueprints. The standard airframe was combined with the only available engine, the Jumo 211F, and so the result differed from the original German design by having a larger engine cowling. The plane had difficult handling characteristics, especially during takeoff and landing and very unforgiving controls, reasons for which it earned the nickname “mule.”
HA-1112-M1L Buchon
HA-1112-M1L Buchon (literally, "big throat"), which is both a male dove or a pelican in Spanish. It first flew 29 March 1954. The 1112-M1L was equipped with the 1,600 hp Rolls-Royce Merlin 500-45 engine and Rotol propeller. This engine required the addition of a deep chin intake, whence the name Buchón. Its armament consisted of two 20 mm Hispano-Suiza 404/408 cannons and two Oerlikon or Pilatus eight-packs of 80 mm rockets. It remained in service until 27 December 1965.
Since the HA-1112-M1L remained in flying condition until the mid-1960s, it allowed them to later be used for theatrical purposes, disguised as Emils and Gustavs (See Messerschmitt Bf 109: Developments after World War Two) in movies like "Battle of Britain", "Memphis Belle", and "Tuskegee Airmen". Remarkably, Buchons also played the Bf 109's opposition, the Hawker Hurricane, in one scene in "Battle of Britain".
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Questo messaggio è stato modificato da Blue Sky: 29 agosto 2008 - 13:16