Ne-20
Ishikawajima Ne-20
Type	Turbojet
Manufacturer	Ishikawajima-Harima Heavy Industries
First run	1945
Major applications	Nakajima Kikka
Number built	c.5

The Ishikawajima Ne-20 (Japanese: 石川島 ネ-20) was Japan's first turbojet engine. It was developed during World War II in parallel with the nation's first military jet, the Nakajima Kikka.

The decision to manufacture this engine came about because of the unsuitability of two earlier powerplants selected for the Kikka, the Tsu-11 and the Ne-12. The Ne-20 was made possible by Imperial Japanese Navy engineer Eichi Iwaya obtaining photographs and a single cut-away drawing of the German BMW 003 engine.

Only a small number of these engines, perhaps fifty, were produced before the end of the war. Two of them were used to power the Kikka on its only flight on August 7, 1945. Only a few of the engines under construction survived. It was also planned to use the engine to power a version of the Ohka kamikaze weapon, but this was not implemented before the end of the war.

Ne-20

Standard production engines

Ne-20-Kai

Up-rated version

Three Ne-20s have been preserved to the present day, one at Ishikawajima-Harima's internal company museum in Tanashi, and two at the Smithsonian's National Air and Space Museum in Washington, DC.

Data from Turbojet History and Development 1930–1960 Volume 2:USSR, USA, Japan, France, Canada, Sweden, Switzerland, Italy and Hungary^[1]

• Type: Turbojet engine
• Length: 2700 mm
• Diameter: 620 mm
• Dry weight: 470 kg

• Compressor: 8-stage Axial compressor
• Combustors: Annular combustion chamber
• Turbine: 1-stage axial turbine

• Maximum thrust: 475 kgf (4.66 kN, 1,047 lbf) at 11,000 rpm
• Specific fuel consumption: 1.5 lb/(lb h)
• Thrust-to-weight ratio: 1.01

Comparable engines

• BMW 003
• Junkers Jumo 004
• Heinkel HeS 006 — later, more common designation: Heinkel HeS 30

Related lists

• List of aircraft engines

• Goodwin, Mike & Starkings, Peter (2017). Japanese Aero-Engines 1910-1945. Sandomierz, Poland: MMPBooks. ISBN 978-83-65281-32-6.

Wikimedia Commons has media related to Ishikawajima Ne-20.

• Kugisho Ne-20, Naval Air Technical Arsenal, Turbojet Engine Archived 2018-08-01 at the Wayback Machine -National Air and Space Museum