Nakajima Ha219

The Nakajima Ha219, (also known as the Ha-44under the unified designation system, BH by the company and NK11A by the Imperial Japanese Navy Air Service (IJNAS)), was a late war Imperial Japanese Army Air Force (IJAAF) 2461 hp 18-cylinder air-cooled radial engine, used on the Tachikawa Ki-94-II, Nakajima Ki-84-N and Nakajima Ki-87.

Variants and designations
Data from: Japanese Aero-Engines 1910-1945
 * BH: Company designation
 * Ha219: IJAAF Hatsudoki designation
 * Ha219Ru fitted with a large turbo-charger alternative designation for the Ha-44 model 12


 * Ha-44: Unified (IJAAF & IJNAS) designation system
 * Ha-44 model 11 A prototype turbocharged 2400 hp engine for the Ki-87.
 * Ha-44 model 12 Similar to the Model 11 and probably sporting a 16-bladed cooling fan in the cowling intake.
 * Ha-44 model 13 A planned variant to power the Navy 20-shi A Carrier Fighter


 * NK11A: Planned engines for a scaled down Nakajima G10N1 (Navy Experimental Heavy Bomber Fugaku) (Fugaku - Mount Fuji)

Applications
A total of around 10 engines were built, but the engine suffered from over-heating at low speeds and required large amounts of maintenance. Around 7 where issued to the Kitai squadron in late 1945 and used on the New Ki-84-N, lacking the supercharger installed on the Ki-94-2 and Ki-87. most are believed to have been scrapped or destroyed after the war along with documentation.
 * Nakajima Ki-87
 * Nakajima G10N1 (Navy Experimental Heavy Bomber Fugaku)
 * Nakajima Ki-84-N
 * Tachikawa Ki-94-2