help with Prop Blade ID

[Clydesdale_Kid]

I was recently given two Prop blades from a gentleman who inherited them but had no information on them and I would like to trace a bit of their history.

The blades have part numbers and serial numbers on them ( though the painted drawing numbers have a slight mismatch to the stamped numbers).

Painted numbers on one of the blades
DWG. NO. 6985B-7
SER. NO - 751556
Corr. Angle +.15

the stamped numbers at the base plate of the same blade
DWG NO 6985A-7
MFGN 751554
JR2.092
60FA-669

I have included a bunch of images which probably tell the story better than I do. They are certainly heavy blades and according to the Goodyear Iceguards still on them, they should be Hamilton Standard units. Trawling through what Hamilton Standard lists I could find, they look like the correct part numbers for Hamilton Standard but I have not been able to uncover any details on possible Hubs / Engines or aircraft the blades might have come from.

Any help in identifying the engine and/or aircraft these might have come off, or even some pointers on where I might be able to find the information I seek would be greatly appreciated

 

[Wurger]

Judging by the shape and markings it's a post-war Hamilton Standard propeller blades with the the de-ice boot. Quite similar to these used for the North American T-28 Trojan.

 

[Michael Hope]

The Hamilton Standard 6985B-7 blade can be used on the Grumman S2F Tracker.

The "JR" number is the distance on the width of the blade butt including the aluminum shank, and the two-steel blade thrust washers. If the dimension goes below that dimensions by more than 0.008 inches, the aluminum blade shank would have to be re-cold rolled to return the fatigue strength to blade.

The "6985B-7" is the blade including the electrical de-ice boot, the "6985A-7" is the bare blade without the de-ice boot.

The Tracker used a Hamilton Standard 43D51 propeller, and a wright 1820 series engine, or the military equivalent series. This series of engine used a different output shaft with fine pitch teeth instead of the much wider teeth found on the stand 50 spline shaft.

 

[Clydesdale_Kid]

Awesome, thanks for the reply. Great to have an idea of what they might have been used on.