J2M "hydraulic actuator"

[Supercharged]

Hi there,

I am searching for the purpose of the hydraulic actuator located in the engine nose cowl, 2 o'clock ALF of the J2M aircraft.

On this image you can see a small drive shaft going from the actuator to the propellor shaft. Is it the prop pitch actuator?

 

[cvairwerks]

Based on that photo, I wonder if it has something to do with controlling the fan speed?

 

[cammerjeff]

I do not know what the actuator adjusts, but I don't think it would be propeller pitch, but I could be wrong, possible cooling fan speed?

But the one remaining J2M is at the Planes of fame Museum in Chino California. You could contact them with the question

I see cvairwerks beat me to the sugestion of cooling fan speed.

Home Page | Planes of Fame Air Museum

planesoffame.org

 

[ThomasP]

FWIW

The propeller on the J2M1 prototype - and maybe a few of the pre-production J2M1 - was an electric type, but the production models all used a license produced VDM (I think). Maybe checking out VDM types would help answer the question.

 

[Wurger]

In meantime the enlarged shots ....

the pic source: the net.

PS .. and yes it looks like the actuator was for the prop pitch setting using a a hydraulic regulator (プロペラ油压原動機 - propeller hydraulic engine).

The Kasei engine drove a 3-bladed or 4-bladed Hamilton Standard-type constant-speed metal propeller. The constant-speed unit (CSU) operated as a hydraulic regulator. When the pilot selected a target RPM, the governor used pressurized engine oil to twist the propeller blades into a higher pitch (coarse) or lower pitch (fine) to maintain that engine speed, regardless of the aircraft's altitude, climb rate, or airspeed

パネルを開けて「プロペラ油压原動機」を見る。

プロペラを折りたたむ用途 - for propeller pitch operation ...

 

[Supercharged]

Thanks guys for your fast response, now another mystery is solved .......