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= MItsubishi Ha-42 =

The Mitsubishi Ha-42 was a 18-cylinder, air-cooled, two-row radial aircraft engine developed by Mitsubishi Heavy Industries in for the Imperial Japanese Army (IJAAF). The Mitsubishi model designation for this engine was A18 while it was an experimental project, in service it was known as the MK6 by the Navy, and as the Ha104(1,900hp Army Type 4) by the Army.

Design and development
A18 was developed under a contract for IJAAF in 1940. Two prototypes gesignated Ha-30 and Ha-31 were developed, but neither went into production. After Ha101 was accepted by the Army, the A18 was updated to a similar level.

Despite having teething issues with exhaust valves overheating and exhaust pipes cracking under heat, Ha-42 turned out to be surprisingly reliable for an 18 cylinder radial engine.

The main drawback of the HA104 was it's mediocre high altitude rating, which Mitsubishi was adressing with later variants of the engine.

Applications

 * Mitsubishi Ki-69
 * Mitsubishi Ki-97
 * Mitsubishi Ki-109
 * Mitsubishi Ki-112
 * Tachikawa Ki-70
 * Tachikawa Ki-92
 * Tachikawa Ki-104
 * Kawasaki Ki-119