YFM-1 (plane)
Bell YFM-1 エアラクーダ
USAAF P-39F
- A use: Fighter
- A manufacturer: Bell aircraft
Bell XFM-1/YFM-1 エアラクーダ (Bell XFM-1/YFM-1 Airacuda) is the fighter which Bell Aerospace Corp. produced experimentally before World War II for American Air Corps. It was the two-engined plane which was developed for the purpose of guarding four heavy bombers, but it became the complete failure, and the development was called off.
Summary
The American Air Corps started the trial manufacture specifications of the long distance escort fighter to guard under development Boeing flying fortress bomber in those days in 1936, but a plan of Bell Aerospace Corp. which applied for this became the adoption, and one prototype was ordered as XFM-1. For Bell Aerospace Corp. founded in 1935, this body was the first design.
XFM-1 had the low-wing having a single wing shoulder durability-type main wing in all metal bodies of the semi-monocoque by a large two-engined plane more than overall width 20m, and the main gear was a half gaining over expression. The engine carries Allison V-1710-13 with a turbo supercharger;, as for the propeller, came to promotion-type. And the anterior engine Nasser became the manned emplacement, and by the 1 gate was equipped with a 37mm cannon here. A rifleman operated it directly, and a navigation person was able to remote-control the cannon. I had a shelter belt emplacement on of the teardrop type toward the body side. In addition, bomb bay was established on the body and was able to be equipped with 20 14 kg of aviation bombs.
The first unit of XFM-1 made the first flight in September, 1937. However, as for the maximum speed, 37km/h was slower than a plan level, too. The flight performance was largely inferior to a single-engine fighter, too. However, the American Air Corps placed an order for increase prototype YFM-1 13 for the development test in May, 1938.
The first unit of YFM-1 made the first flight in September, 1939. This body was equipped with Allison V-1710-13 same as XFM-1 at first, but replaced it with the Allison V-1710-23 engine without the turbo supercharger halfway because I raised an explosion accident during a test. All the following bodies were equipped with this engine (some bodies were replaced with Allison V-1710-41 later). In addition, the form of the details of the body was different from XFM-1, too. The apron stage of the Nasser side disappeared by a turbo supercharger having disappeared, and the air intake was moved to alar part outside the main wing by the Nasser top surface. In addition, a spinner was attached to a propeller. The main wing and the body were extended each. Although the placement of the 37mm cannon did not change as for the armament either, the placement of the 7.62mm machine gun became one order to the nose in one order, the undersurface on two orders, the posterior body back.
However, the flight performance of YFM-1 was poor as well as XFM-1. The speed was originally less than the flying fortress which I should guard late more than XFM-1. In addition, because is slow-witted; a spin roll could not make somersault, and was the exercise performance that was too poor for a fighter. In addition, in the operational aspect, there were the livability of the emplacement which I established to point that was easy to overheat because an engine was lacking in cooling, and could not run at the time of the ground run by oneself and engine Nasser or a safe problem, and there were too many problems when I turned it to the practical use. Still I performed repair such as remodeling some bodies into 3 wheel ceremonies, but a too expensive body expense became the decisive factor, and, in YFM-1, it was the production end only with 13 planes for the ordering at first.
All planes were turned for the teaching materials above the ground for the next 1,942 years and were just subjected to a scrap soon.
Specifications
- Full length: 14.34m
- Overall width: 21.34m
- Overall height: 5.94m
- A wing area: 63.7 m2
- Gross weight: 8,607 kg
- An engine: Allison V-1710-23 liquid cold water 12 cylinder 1,150 hp *2
- Maximum velocity: 431km/h
- The practical use upper limit is high: 9,296m
- A flying range: 1,513km
- Armament
- Bomb 140 kg *2
- 37mm cannon *2
- 7.62mm machine gun *4
- Five crews
Allied item
This article is taken from the Japanese Wikipedia YFM-1 (plane)
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