USAAF Hydraulic Governor parts

[frenchie]

Hello everyone, could you tell me on what type of plane this part was installed? Thank you for your help. Have a good day. Laurent

 

[Wurger]

The Nash-Kelvinator Corporation hydraulic governor for the USAAF airplane prop the contract number W535-AC-25051 started in July 1942 completed in July 1943. This may identify an aircraft with Hamilton-Standard three blade propellers: A-20, C-47, C-53, B-17, B-24, B-25, Baltimore, Lancaster, and Mosquito. The list of propellers made by the manufacturer in 1942-1943 indicates the Hydromatic 3-Blade, Dural, 23-E-50 props that could be used for B-17 Flying Fortress, B-25 Mitchell, A-26 Invader, and the C-47 Skytrain and also the and 20EX one for British planes. The variant was developed to adapt the standard American 23E50 hydraulic mechanism to British Rolls-Royce Merlin engines, which required a specific British No. 5 spline shaft. So the Canadian-built RAF kites could be.
Because of the cover casted of the BOHNALITE you posted in another thread a USAAF plane is very likely.

 

[SaparotRob]

Love these sleuth threads.

 

[ian_]

This is indeed a constant speed unit from the reduction gear cover at the front of an American made radial engine. British versions were licence made by DeHavilland and weren't painted like this.

 

[Michael Hope]

The governor appears to painted "black", originally (i.e. late 30's) they were painted gray. The gray paint was to indicate that it was an engine accessory, stayed with the engine when removed from aircraft. Then they were painted black to indicate that it was not part of the engine.
The governor is missing the head, so unknown if it was an electric head, used on B-24, or the mechanical head with a pulley and cable to change the propeller pitch, like the C-47, B-17 used.
The governor appears to have the parts needed for attachment of the feather pump line, the boss is broken off of the body, and the gasket for the cut-out switch on the base to turn off the feather pump when it hit the required pressure, i.e. the propeller has hit its internal feather stop.
There is no coupling visible coming out of the base to the engine mounting pad.
The Merlin and Packard engine had internal splines in the drive gear, so the engine mounting pad had an external splined gear coming out of center of the pad.
The radial engines, R-1820, R-1830, R-2600 had a internal spline in the mounting pad and the governor had an external spline that came out of the base of the governor. It was either a removal spline adapter or an adapter attached to the drive gear by a retaining wire with three ears to drive it.
The relief valve is the very early design before they changed to a different design, with a longer relief valve cap.

 

[Engineman]

The governor appears to painted "black", originally (i.e. late 30's) they were painted gray. The gray paint was to indicate that it was an engine accessory, stayed with the engine when removed from aircraft. Then they were painted black to indicate that it was not part of the engine.

Hi Michael,
I am surprised that you say this item appears to be painted "black", because on my large monitor, it appears Grey?

Cheers

Eng

 

[Michael Hope]

Hi Michael,
I am surprised that you say this item appears to be painted "black", because on my large monitor, it appears Grey?

Cheers

Eng

If it is gray, then it makes it a earlier production version of the governor.

 

[SaparotRob]

The knowledge here is amazing.