Propeller identification (Hamilton Standard)

omar4363 · Nov 1, 2020

Hello. I would like to get some help with a Hamilton Standard propeller I am restoring for display purposes. I found this numbers:

DWG 6101A-12 (just in one blade)
MFG T21571 (in one blade)
MFG T21572 (in the other blade)
Shank 56151

I am trying to find out:
-What airplane it was used on (I believe it belongs to a Texan T-6)
-Low angle and high angle information
-Is the DWG the type of the propeller?
-Is the MFG the serial number from each blade?

Thank you for your help.

Michael Hope · Nov 1, 2020

The Texan/T6 would use a Hamilton Standard 12D40 propeller using the 6101A-12 blades with a nominal diameter of 9 feet. But from looking at the propeller it looks more like the smaller 2D30 which also used the 6101A-12 blade. One way you can tell is the inner diameter of the cylinder, the 2D30 is nominal about 3.750 inches, where the 12D40 is nominal about 4.500 inches. Also the exposed diameter of the piston shaft where it exits the cylinder for the 2D30 is nominal 3 inches but on the smaller side, the 12D40 is nominal 3 5/8 inches but on the smaller side. From your last images the aluminum cylinder is at the top, the smaller outer diameter to check would be below the cap and the area with the holes for the locking ring, the wall thickness of the aluminum is about 1/8 inch nominal. The steel piston shaft can be seen below the cylinder that is where is can be measured. Many different aircraft used the 2D30 and 12D40 with the 6101A-12, before, during and after WW II.

omar4363 · Nov 2, 2020

Michael Hope said:
The Texan/T6 would use a Hamilton Standard 12D40 propeller using the 6101A-12 blades with a nominal diameter of 9 feet. But from looking at the propeller it looks more like the smaller 2D30 which also used the 6101A-12 blade. One way you can tell is the inner diameter of the cylinder, the 2D30 is nominal about 3.750 inches, where the 12D40 is nominal about 4.500 inches. Also the exposed diameter of the piston shaft where it exits the cylinder for the 2D30 is nominal 3 inches but on the smaller side, the 12D40 is nominal 3 5/8 inches but on the smaller side. From your last images the aluminum cylinder is at the top, the smaller outer diameter to check would be below the cap and the area with the holes for the locking ring, the wall thickness of the aluminum is about 1/8 inch nominal. The steel piston shaft can be seen below the cylinder that is where is can be measured. Many different aircraft used the 2D30 and 12D40 with the 6101A-12, before, during and after WW II.

Thank you very much, very useful information. Based on your information, I took some measurements to the propeller, below I show you the pictures, maybe they can help you to confirm your information.

You're probably right and the propeller is a 2D30 so maybe it didn't belong to a T-6 Texan. I'm thinking that the propeller belonged to a STINSON F-19 plane (see the picture below).

I'm about to finish restoring the damaged propeller, but I think it looks pretty good. It would be a shame if it ended up in an aluminum foundry.

Thank you again for your information.

11bwmech · Nov 5, 2020

omar4363 said:
Hello. I would like to get some help with a Hamilton Standard propeller I am restoring for display purposes. I found this numbers:

DWG 6101A-12 (just in one blade)
MFG T21571 (in one blade)
MFG T21572 (in the other blade)
Shank 56151

I am trying to find out:
-What airplane it was used on (I believe it belongs to a Texan T-6)
-Low angle and high angle information
-Is the DWG the type of the propeller?
-Is the MFG the serial number from each blade?

Thank you for your help.
View attachment 600332 View attachment 600333 View attachment 600334

If it's a 2D30, I seem to remember that model was used on the Twin Beech (C-45, T-11, etc.). At 86, my memory isn't all that great, so I could be wrong. Are you positive it's a Hamilton Standard? BTW, DWG probably means drawing no. And MFG may well stand for Manufacturer, even though it doesn't seem right with a "G" in it. A manufacturer's part or serial no. For what it's worth.

omar4363 · Nov 8, 2020

11bwmech said:
If it's a 2D30, I seem to remember that model was used on the Twin Beech (C-45, T-11, etc.). At 86, my memory isn't all that great, so I could be wrong. Are you positive it's a Hamilton Standard? BTW, DWG probably means drawing no. And MFG may well stand for Manufacturer, even though it doesn't seem right with a "G" in it. A manufacturer's part or serial no. For what it's worth.

Beechcraft C-45 Expediter, nice plane, used in my country as a transport and aerial photography. Good information, thank you 11bwmech

Michael Hope · Nov 8, 2020

The Beechcraft C-45, Twin Beech, Model 18, used a much shorted diameter blade about 8 foot 3 inch, nominal diameter. His propeller would be from something like a DE Havilland Beaver DHC-2, with a nominal 9 foot diameter. His propeller has the light aluminum counter weight caps, so the eliminates the Beaver from a possible aircraft, which used a heavier steel counterweight cap.

The light aluminum counter caps were used on the "Two Position" type propeller just high and low pitch; these do not use a pitch change governor for constant speed operation.

fromtheashes82 · Nov 16, 2020

omar4363 said:
Hello. I would like to get some help with a Hamilton Standard propeller I am restoring for display purposes. I found this numbers:

DWG 6101A-12 (just in one blade)
MFG T21571 (in one blade)
MFG T21572 (in the other blade)
Shank 56151

Fantastic job restoring the prop. This blade was used on:

Basic Training Aircraft
BT-9 B/C/ & D
BT-10
BT-12
BT-13A
BT-15

Cargo/Transport
C-64A
UC-40 A/B/ & D Variants

omar4363 · Jan 5, 2021

fromtheashes82 said:
Fantastic job restoring the prop. This blade was used on:

Basic Training Aircraft
BT-9 B/C/ & D
BT-10
BT-12
BT-13A
BT-15

Cargo/Transport
C-64A
UC-40 A/B/ & D Variants

Hello F fromtheashes82 , thanks for the information, it was very useful during the investigation to determine the aircraft in which the propeller could be installed. I have finished the restoration project and I am posting the link on youtube if you would like to observe the entire process carried out in the restoration of the propeller.

Rgds.

omar4363 · Jan 12, 2021

Michael Hope said:
The Beechcraft C-45, Twin Beech, Model 18, used a much shorted diameter blade about 8 foot 3 inch, nominal diameter. His propeller would be from something like a DE Havilland Beaver DHC-2, with a nominal 9 foot diameter. His propeller has the light aluminum counter weight caps, so the eliminates the Beaver from a possible aircraft, which used a heavier steel counterweight cap.

The light aluminum counter caps were used on the "Two Position" type propeller just high and low pitch; these do not use a pitch change governor for constant speed operation.

Hello, I made a last measurement of the propeller, and it measured 268 cm (8ft + 9.6in). Considering the 6101A-12 blade type, my last possibility of choice to identify the aircraft is:
1) BT-13A (2D30-227-6101A-12 9ft. 1 in)
Do you think it could be possible that the propeller has operated in a Dhc-2 Beaver?
Rgds

Michael Hope · Jan 13, 2021

omar4363 said:
Hello, I made a last measurement of the propeller, and it measured 268 cm (8ft + 9.6in). Considering the 6101A-12 blade type, my last possibility of choice to identify the aircraft is:
1) BT-13A (2D30-227-6101A-12 9ft. 1 in)
Do you think it could be possible that the propeller has operated in a Dhc-2 Beaver?
Rgds

It is definitely not for a DHC-2 Beaver. The Aluminum counter weight caps were used on Two Position propellers, the do NOT use a propeller governor. The Beaver used a governor that was mounted on the P&W R-985 on the gun synchronizer pad, with external oil lines to the front of the engine.

Propeller identification (Hamilton Standard)

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