The US Military adapted the Sioux (designated as H-13H) with an increased-diameter rotor and a 168KW 6VS-335 engine in 1962. These were designated as H-13-E,H-13-G, and H 13-H.
These are the ones you are asking about Geordie.
External stretchers were added in 1952, this Sioux was designated H-13 C, possibly for the Korean War?
The British Army model was the Model 47 G-2 built under license by Westland with modifications that included dual controls and three seats,increased fuel capacity, later with gyroscopic (the bane of many a Greenie)intrumentation. This particular model was the go-to model favoured by over 30 armed services. By the way, the yellow line painted on the perspex was added by us at Middle Wallop because trainee pilots were having accidents identifying "level flight".
In my neck of the woods, I watch with wry nostalgia every springtime as one of the Sioux cropdusters (I do'nt know their designations) clatter their way upriver to spray control for that year's mosquito larvae so I may comfortably sip my single malt in peace during the bucolic evenings that are left in my life .
I am sure you are more familiar with the mechanical specifications than I a lowly Greenie, but should you wish to discuss the mysteries of the PTR 170 or the AN/ARC 44, I'mm your man !
Many regards
Fred
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