Hamilton Standard 23E50 Dome Part Number

[dfethers]

Hi all,

Was wondering if anyone can identify which dash of 23E50 a 61196-12 dome might have been used with?

I have cross-referenced as many Ham Standard manuals as I can find but the 61196-12 doesn't show up in the lists. The domes are available in inventory through parts suppliers so they were obviously fairly common. The manuals I have are all pre 1960 so I'm wondering if this was a later dome?

Cheers for any help, Dave

 

[aircraftclocks]

I have it as being for 23E50 - 473 & 505.

 

[Michael Hope]

I have it as being for 23E50 - 473 & 505.

The item by descriptions is actually the piston assembly, the 23E50-473 and the 23E50-505 both use that specific piston assembly, found in Parts Catalogue 198, dated 1955.

The piston assembly without the dash number is the two bleed hole piston, can be used in the 23E50, 23EX, 33E60, figure 28, 23E50 in figure 31, and 24D50 in figure 34.
Here is an image from the H/S manual 143, the IPL for the propeller series, that shows the basic number.

 

[dfethers]

Thanks both. Always amazes me the amount of knowledge on these forums. Cheers, Dave

 

[Michael Hope]

Thanks both. Always amazes me the amount of knowledge on these forums. Cheers, Dave

The only real value of the piston assembly is the liner as that is the part that wears out and needs to be replace. Yes the only real wear would be in the hole for the shafts for the cam rollers from repeated installation of the shafts. They do do show an oversize shaft, but then you also need oversized bushings for the rollers and then oversize snap rings. Since they are so many WW II surplus parts, you would never need to use the oversize. I have thrown away many other wise good pistons once the liners were worn out and the holes for the shafts are questionable.

 

[dfethers]

Cheers Michael. The liner inspects OK. I am back converting a -505 to a non-feathering -489

 

[Michael Hope]

Cheers Michael. The liner inspects OK. I am back converting a -505 to a non-feathering -489

The -473 dome would be better as it has the correct cams, and the same dome assembly. The difference is the shaft extension for the -489 instead of the Distributor vale assembly. The -505 uses the Fast Acting cams; you tell as the difference in the stationary cam by the two sets of holes for the alignment pins to the barrel. The Standard cam only has one set of the three alignment holes. Careful not to mix the rotating cam types as it will crush the rollers the first time it reaches that point.

Is the prop you need the -489 for a Grumman TBF/TBM?

 

[dfethers]

The -505 I have has the faired knee cam. The -489 I am converting to has the standard cam track, but I can live with the faired knee. In reality, I am just installing the shaft extension assembly, removing the distributor valve and making the -505 non-feathering.

This is going in a full-size Allison powered spitfire replica.

 

[Michael Hope]

The -505 I have has the faired knee cam. The -489 I am converting to has the standard cam track, but I can live with the faired knee. In reality, I am just installing the shaft extension assembly, removing the distributor valve and making the -505 non-feathering.

This is going in a full-size Allison powered spitfire replica.

What blade model are you using? In the past I have been told that they have used cut down 6353A-12 blades, from a PBY/Catalina/Canso, with diameter reduced and shaped to fit the correct blade profile.

 

[dfethers]

Using 6565A-18 (DC-3 needle blades) cut down and re-profiled to -30 to match the rotol diameter of the spitfire. Same conversion as the Allison powered Yak9/3.

 

[Michael Hope]

Using 6565A-18 (DC-3 needle blades) cut down and re-profiled to -30 to match the rotol diameter of the spitfire. Same conversion as the Allison powered Yak9/3.

Are you leaving the vibration dampening balls inside of the 6565 blades, if you remove them then they become 6353's.

Here is the text for rework procedures from manual 140, on your original question.

 

[dfethers]

Sorry, brain fart in my last message. They're 6353A-18 blades reduced to -30s and reprofiled by San Antonio Propellers.
I have the 61196-12 piston and have sourced a 52940 shaft extension tube. Should now just be a case of setting the stop rings to something appropriate for non-feathering and giving it a test.