WW2 Alloy Prop - I'd help please

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jangter

Recruit
8
2
Sep 3, 2023
Hi, I've had this in my collection for a long time and never realised a forum like this existed. My prop was entangled in a boat fishing net 3 miles from the beach at Pakefield, Lowestoft. It has nice clear markings. MFG 488 887. And some small heart shaped stamps with numbers inside
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This looks like a Hamilton Standard blade, or a licensed built copy. It appears to be right hand rotation. Do you see any markings with numbers like 6501A-0 or 6101A-12 on the blade shank near the MFG #? If you can not find model number are you able to measure the diameter the blade shank, they were manufactured in several different sizes. One is about 6 and 3/4 inches across, another one was 7 and 1/4 inch across, and the last one is about 8 and 1/4 inch across. Are you able measure the length of the blade, that would also help to identify it.
 
This looks like a Hamilton Standard blade, or a licensed built copy. It appears to be right hand rotation. Do you see any markings with numbers like 6501A-0 or 6101A-12 on the blade shank near the MFG #? If you can not find model number are you able to measure the diameter the blade shank, they were manufactured in several different sizes. One is about 6 and 3/4 inches across, another one was 7 and 1/4 inch across, and the last one is about 8 and 1/4 inch across. Are you able measure the length of the blade, that would also help to identify it.
Wow! Ok. Thanks, will do this tomorrow evening
Thanks 🙏
 
Hi, thanks again for your help. So I've looked and had a little clean and found

MFG 433 887

SHANK 5690 CHG. L\N

RACROP ?

It measures (approximately) 6 3/4" at the base and 11" at the widest part. The end was as visible, damaged on water impact so about 58" long
 

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Hi. I just wondered if anyone has any other possible information. X
Based on the blade dimensions you gave, the shank drawing # 56904 from the image, and the possible remaining material on the blade shank, I suspect that it is a blade model 6487A-24, or 6523A-24, with a round tip shape, used in the Hamilton Standard propeller model 24D50, as used on the P-51. The length is shorter because of the damage to the tip. The nominal -24 blade would be about 64 inches in length.

The "PACTOR", would be "TRACTOR", which is the location of the blade gear segment that makes the propeller a Right-Hand Tractor Propeller, i.e. the air stream is in front of the propeller, with the power plant behind the propeller in the airstream. A pusher propeller would have the blade gear segment installed so that the air stream would come from the direction of the power plant and then leave through the propeller, like a B-36 had.
 
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Based on the blade dimensions you gave, the shank drawing # 56904 from the image, and the possible remaining material on the blade shank, I suspect that it is a blade model 6487A-24, or 6523A-24, with a round tip shape, used in the Hamilton Standard propeller model 24D50, as used on the P-51. The length is shorter because of the damage to the tip. The nominal -24 blade would be about 64 inches in length.

The "PACTOR", would be "TRACTOR", which is the location of the blade gear segment that makes the propeller a Right-Hand Tractor Propeller, i.e. the air stream is in front of the propeller, with the power plant behind the propeller in the airstream. A pusher propeller would have the blade gear segment installed so that the air stream would come from the direction of the power plant and then leave through the propeller, like a B-36 had.
Wow. Ok, this makes sense why the diver thought it was a spit because he saw a single seater plane. This also makes sense with the location as there were many fighter escorts over this part of the channel. I am very happy with the information. Thankyou guys. X
 
I have seen the heart shaped inspection stamp used on Hamilton Standard propeller parts, but I do not know if it is an actual Hamilton Standard stamp or that of a sub-contractor.
 
If your question is for me, then I would say that if you can find out for sure who the heart shaped inspection stamp belongs to it may help figure out who made the blade, and thereby what type of aircraft the prop blade may have been fitted to. As an example, some Canadian aircraft manufacturers used Hamilton Standard props made by Hamilton Standard, but I think that Hamilton Standard props were made under license (after the war for sure, maybe during the war) - so who made the blade? I know that there were blade manufacturers in Canada.

In other words, the blade may be (probably is) a Hamilton Standard design, but without the blade drawing number we really do not know the aircraft (possibility several aircraft types) that used it, or the nationality, or even if it is a WWII blade..
 
If your question is for me, then I would say that if you can find out for sure who the heart shaped inspection stamp belongs to it may help figure out who made the blade, and thereby what type of aircraft the prop blade may have been fitted to. As an example, some Canadian aircraft manufacturers used Hamilton Standard props made by Hamilton Standard, but I think that Hamilton Standard props were made under license (after the war for sure, maybe during the war) - so who made the blade? I know that there were blade manufacturers in Canada.

In other words, the blade may be (probably is) a Hamilton Standard design, but without the blade drawing number we really do not know the aircraft (possibility several aircraft types) that used it, or the nationality, or even if it is a WWII blade..
The shank design number is visible as 5690?, the only similar shank design number is 56904. The diameter of the shank was reported as about 6 3/4 inches which matches the "D" shank blade design. The 56904 is for D shank blades. Possible models that used the 56904 where the following per H/S manual 130: 6487A, 6505A, 6523A, 6529A, 6531A, 6533A, 6535A, 6539A, 6547A, 6593A, 6597A, 6601A. The reported maximum blade width was reported as about 11 inches, which by looking at the blade width specifications it eliminates all but the 6487A, 6523A, and 6547A. These were all used on the P51, with the 24D50 propeller. There is evidence of the remains of a blade cuff still present on the inner portion of the blade, so that would be either the 6487A and 6523A, which used blade cuffs, and had full round blade tips.

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The shank design number is visible as 5690?, the only similar shank design number is 56904. The diameter of the shank was reported as about 6 3/4 inches which matches the "D" shank blade design. The 56904 is for D shank blades. Possible models that used the 56904 where the following per H/S manual 130: 6487A, 6505A, 6523A, 6529A, 6531A, 6533A, 6535A, 6539A, 6547A, 6593A, 6597A, 6601A. The reported maximum blade width was reported as about 11 inches, which by looking at the blade width specifications it eliminates all but the 6487A, 6523A, and 6547A. These were all used on the P51, with the 24D50 propeller. There is evidence of the remains of a blade cuff still present on the inner portion of the blade, so that would be either the 6487A and 6523A, which used blade cuffs, and had full round blade tips.

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Wow. Amazing information . Internet! Such a brilliant thing. Thank you all so much, and especially yourself Michael. The awful question pending is how to value this?
 

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