Nakajima Ha219

The Nakajima Ha219, (also known as the Ha-44 under 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) 2,461 hp (1,835 kW) 18-cylinder air-cooled radial engine, used on the Tachikawa Ki-94-II, Nakajima Ki-84-N and Nakajima Ki-87.

Ha219
Type 18-cylinder two-row radial aircraft engine
National origin Japan
Manufacturer Nakajima
Number built ~10

Variants and designations

Data from: Japanese Aero-Engines 1910-1945[1]

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 2,400 hp (1,800 kW) 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 were 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.


Specifications (Ha219 / BH / NK11A / Ha-44)

Data from Japanese Aero-Engines 1910-1945[1]

General characteristics
  • Type: 18-cylinder air-cooled two-row radial piston engine
  • Bore: 146 mm (5.75 in.)
  • Stroke: 160 mm (6.30 in.)
  • Displacement: 48.2 L (2,941 cu in.)
  • Length: 1524 mm (60 in.)
  • Diameter: 1280 mm (50.4 in.)
  • Dry weight: 1,150 kg (2,535 lb)

Performance
  • Power output: 2,400 hp (1,800 kW) at 2,700rpm
  • Compression ratio: 7.2
  • boost +350 mm Hg

References
  1. Goodwin, Mike; Starkings, Peter (2017). Japanese Aero-Engines 1910-1945. Sandomierz, Poland: MMP Books / Stratus Sp.J. pp. 175–176. ISBN 978-83-65281-32-6.
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