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Old 08-14-2017, 07:54 PM   #1
Tony Kearns
 
Join Date: Sep 2013
Posts: 10
Default Identity of Prop (boss)

Good evening all,
A visitor to the Irish Air Corps Museum and Heritage Centre showed us details of a boss which he has (it always makes me sad when the propeller is cut to the boss) It has listed the following on the side :
27.5 Rolls Royce (or it may be 275)
D280, P3600, AB 686 RH and with 2751 on the front.
Any help is much appreciated.

Regards
Tony Kearns
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Old 08-15-2017, 07:03 AM   #2
Dbahnson
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It's not listed in my reference material, but drawing AB 685 had two versions with slightly different diameter and pitch used on a DH4 with the Rolls Royce Eagle and Eagle 8 engine. Both were 4 bladed left hand tractor versions, so it's possible that this was a right hand version of one of those. Is it 4 blade or two?
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Old 08-15-2017, 09:51 AM   #3
Tony Kearns
 
Join Date: Sep 2013
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Great many thanks. The owner states it is a two blade, but he did not bring it into the museum.
It was found at Ballincollig, Co. Cork, there was a barracks and a landing field nearby used by the RFC/RAF during the war of independence. I was not aware that DH4 was used during that period but it seems to fit. I am hoping that the boss would be donated to the museum and then we can photograph it .
Thanks as always for your help now and on previous occasions.
Regards
Tony K
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