Info needed on Nakajima Kotobuki

Discussion in 'Engines' started by msxyz, Sep 10, 2012.

  1. msxyz

    msxyz Member

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    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.
     
  2. msxyz

    msxyz Member

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    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...
     
  3. fubar57

    fubar57 Well-Known Member

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    This is all I could find,Nakajima Ha1b
    ki27.JPG ki271.JPG

    Geo
     
  4. msxyz

    msxyz Member

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    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!
     
  5. vikingBerserker

    vikingBerserker Well-Known Member

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  6. Aurum

    Aurum Member

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    I guess you will like this one :)
     

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