Need Help identifying this blade

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Jun 14, 2022
Any help would be appreciated. A friends grandfather was a aircraft mechanic in WW2 and they found it in his attic after he died. It is 66 inches from base to tip.


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The blade appears to be like a Hamilton Standard Counter weight type blade, based on the shape of flange. The Hydromatic type blades have a straight 45 degree chamfer, as opposed to the flat portion on the allow clearance for the counter weight bracket. The outer diameter of the blade shank for a "D" shank blade about 6.75 inches, for an "E" shank it is about 7.25 inches. Also the "DWG" number would give you exact model. The may also be a shank drawing number like 56151 for D, or 56152 for E, counterweight type blades; 56904 for D, or 56155 for E, Hydromatic type blades.


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That is a Hamilton Standard Blade DWG 6229A-18, which has the same blade shape and dimensions as the later model/DWG 6353A-18, that was used on the early DC-3/C-47, B17 and B24, the tooth pick type blade.
It is interchangeable in sets with the 6353 blade per the FAA TCDS P-603: Group (b) 6153, 6353 6229, 6429.

It is the Hard Alloy Blade using HSP-26; the 6353 is the softer AMS-4130 alloy version.

I do not have any list of aircraft that show this exact blade model being used on. But the 6229 blade was the first version of the blade, so it may have been used on a very early production or pre production/testing aircraft.
I think the 10- prefix indicates it was made by another manufacturer (either under sub-contract or under license), possibly identical to the HS 6229A design, or to a modification (-18?) that was approved by HS as a replacement for the normal HS blade.

I have seen prefixes like the 10- before but have not been able to find the relationship to the sub-contractor or licensed manufacturer. The 10- might indicate Nash-Kelvinator.

Or I could be totally wrong. :oops:
What you are seeing is "DWG NO" the "N" has been partially worn away.

The Manufacturer/sub contractor is shown in the MFG/Serial #; Nash Kelvinator had a prefix of "NK" for their blades; "RR" was for Remington Rand Inc, Propeller division located in Johnson City New York; plus other sub contractors like "CC" for Canada Car. When the serial numbers do not have letters those blades are generally hade by Hamilton Standard themselves.

Below is a label for some new parts that we just received, manufactured in 1944. They are the thirds over size for blade bushing drive pins, which meant that the USA had surplus manufacturing capacity to make repair parts.


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