M6A "Seiran" The submarine bomber was supposed to combine high speed with a long range, but since the aircraft was actually intended for one-time use, the type of chassis was not even specified. The diameter of the hangar of the submarine aircraft carrier was set at 3.5 m, while the aircraft had to fit in it without disassembly - the planes could only be folded.
At the beginning of 1943, six M6A1s were laid down at the Aichi plant in Nagoya, two of which were made in a training version of the M6A1-K on a wheeled chassis (the plane was called "Nanzan" - "South Mountain"). The aircraft, with the exception of the tip of the keel, hardly differed from the basic version, even retained the attachment points to the catapult.
The structure of the aircraft was all-metal, with the exception of the plywood sheathing of the wing tips and fabric sheathing of the steering surfaces. Two-slot all-metal flaps could be used as air brakes. The crew of two was housed under a single canopy. In the rear of the cockpit, from January 1943, it was decided to install a 13 mm "Type 2" machine gun, which was served by a radio operator. The offensive armament consisted of an 850 kg torpedo or one 800 kg or two 250 kg bombs.
Powerplant. Atsuta-21 is a licensed version of the early modifications of the 12-cylinder liquid-cooled Daimler-Benz DB-601 engine.
From the very beginning, it was envisaged to use detachable floats - the only dismountable part of the Seyran. Since the floats significantly reduced the flight performance of the aircraft, if necessary, the possibility of dropping them in the air was provided. In the hangar of the submarine, respectively, a place was provided for attaching the removed floats.
In early 1942, the Japanese High Command issued an order to shipbuilders for the largest submarines ever built until the beginning of the atomic era in shipbuilding. It was planned to build 18 submarines. During the design process, the displacement of such a submarine increased from 4125 to 4738 tons, the number of aircraft transported on board increased from three to four.
The first production aircraft M6A1 was ready in October 1944, another 7 aircraft were built by December 7, when the aircraft was seriously damaged as a result of an earthquake. By the spring, production was almost restored, but on March 12, an American air raid followed. The plant was again partially destroyed, and soon the production of "Seirans" was discontinued. The main reason for this decision was the problems with the production of the required number of submarines. Instead of 44 originally planned aircraft, until the end of the war, only 28 units were built, including prototypes and wheeled M6A1-K.
|Wing span, m
|Wing area, m²
|1×PE 12 cylinder liquid cooling
|Maximum speed at sea level, km/h
|Maximum speed, km/h
|Maximum rate of climb, m/min
|Service ceiling, m
|Service range, km
|Machine gun, 13 mm «Tipe2»
|Suspended, torpedo / bombs, kg