Info needed on Nakajima Kotobuki

[msxyz]

Hi,

Is there some reliable info and some HIGH resolution pics, plans, drawings, etc... on this engine?

I scouted around the net but all I could find were a few low resolution pics from vintage books. Specimens in museums seem also to be on short supply.

There's one wrecked KI-27 'Nate' in the Tachiarai Peace Museum (I think it was raised from sea) but detailed photos (especially of the engine bay area) are non-existent. Any help would be appreciated.

 

[msxyz]

Nobody? ;_;

Why is so difficult to find info on this one?

The closest thing to a drawing I could find is this 3D reconstruction: Maxforums - Nakajima "Kotobuki" 9-cylinder aircraft engine - page 1 but the author admits several details are just a product of guess work.

Here's some data about the engine:

Nakajima Kotobuki:

9 cylinders air cooled radial engine.
Lenght: 1170mm
Diameter: 1280mm
Weight: 340Kg (Model 1,2), 376Kg (Model 2-Kai), 424Kg (Model 3)
Bore: 146mm
Stroke: 160mm
Capacity: 24.1 liters
Compression ratio: 5.3:1 (Model 1,2,2-Kai); 6:1 (Model 3)
Supercharged: yes, centrifugal blower (1:9.63 rpm to blower ratio)
Redution gear: No (Model 1,2,2-Kai); 0.6875x (Model 3)
Fuel: Gasoline (RON ???)

Performance data:

Model 2-Kai

Max continuous power at sea level: 460HP @ 2100 rpm; +40mm Hg boost
Max continuous power above sea level: 500 HP @ 2100, +40mm Hg Boost (2500 meters)
Take off power: 570HP @ 2300 rpm; +150mm Hg boost

Model 3 (Ha-1 Ko)

Max continuous power at sea level: 540HP @ 2300 rpm; +100mm Hg boost
Max continuous power above sea level: 690 HP @ 2300, +100mm Hg Boost (3500 meters)
Take off power: 610HP @ 2500 rpm; +150mm Hg boost

I hope it will help spark some interest into this one...

 

[fubar57]

This is all I could find,Nakajima Ha1b

Geo

 

[msxyz]

Thanks. I think I saw those already; they're from a book on Nakajima aircraft engines. Once I saw a pic of a rusty crankcase with some pots attached said to be recovered from a Ki-27 crash site but that's all... I cannot believe there no better specimen, pictures or schematics around!

 

[vikingBerserker]

I don't know if this will help, and it might be the book you have referred to:

http://www.ww2aircraft.net/forum/engines/data-base-japanese-aircraft-engines-19466.html

 

[Aurum]

Is there some reliable info and some HIGH resolution pics, plans, drawings, etc... on this engine?

I guess you will like this one