blackhawkdown Posted February 27, 2021 Share #1 Posted February 27, 2021 I am unsure if this propeller is military or not, it’s about 93” tip to tip and variable pitch. Any ideas?I am not sure where to post to ask. Link to comment Share on other sites More sharing options...
M1Garandy Posted February 27, 2021 Share #2 Posted February 27, 2021 Any markings on the hub itself? Something like 2B20, 2D30, 12D40 or similar? Blades are likely marked, but may not be visible without disassembly. It has been 20+ years since I had an HS counterweight prop apart, I can't 100% remember at this point. Could be AT-6/SNJ, BT-13, Twin Beech, OS2U Kingfisher or any number of civvy models but it is hard to nail it down for sure without a model number to compare to the Type Certificate Data Sheet or other manual. Link to comment Share on other sites More sharing options...
TheCrustyBosun Posted February 27, 2021 Share #3 Posted February 27, 2021 55 minutes ago, M1Garandy said: Any markings on the hub itself? Something like 2B20, 2D30, 12D40 or similar? Blades are likely marked, but may not be visible without disassembly. It has been 20+ years since I had an HS counterweight prop apart, I can't 100% remember at this point. Could be AT-6/SNJ, BT-13, Twin Beech, OS2U Kingfisher or any number of civvy models but it is hard to nail it down for sure without a model number to compare to the Type Certificate Data Sheet or other manual. That’s the same list of planes that first came to my mind too. Nice prop. It would look nice on the wall! Link to comment Share on other sites More sharing options...
blackhawkdown Posted February 27, 2021 Author Share #4 Posted February 27, 2021 I will check the hub more closely, thanks for the tip Link to comment Share on other sites More sharing options...
bobatl Posted March 1, 2021 Share #5 Posted March 1, 2021 2B20 for a Cessna UC-78. Where the counterweight arm contacts the cylinder, all the larger counterweight props had a bearing. The 2B20-200 series just had a bronze bushing pressed into the cylinder and that can be seen in your photo. The counterweight arm wears the bushing badly so the 2B20-300 series had a steel bushing with a bronze washer that could rotate and act like a bearing. Link to comment Share on other sites More sharing options...
blackhawkdown Posted March 8, 2021 Author Share #6 Posted March 8, 2021 Great, thanks Link to comment Share on other sites More sharing options...
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