Note: Looking for interior photos of the HO4S-3. If you can help, contact Jerry.Proc@sympatico.ca
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| Bunched together as if for warmth, helicopters of anti·submarine squadron HS-50 have completed their day's flying operations and await their lowering to the hangar deck. The one still in the air is from Utility squadron 21. (From Crowsnest Magazine, December 1961. Photo # HS-66400-98) |
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| Above and below: These front and side photos illustrate the Wright R1300 engine. (Photos by Ian MacCorquodale, Mac's Naval Photography) |
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| The most distinctive feature of the Sikorsky HO4S-3 was the location of the engine in the nose thus enabling the cabin to be placed at the center of gravity. This allowed considerable variations in payload without affecting stability. Special attention was also paid to the question of maintenance. The main parts were easily dismantled in an average time of 12-15 hours and were all designed for ease of access. For example the engine could be changed in two hours, even without special equipment, and daily inspections took a maximum of 15-20 minutes. |
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| Close up of rotor head on this UH-19B helicopter at the Milestones of Flight Museum Fox Field, Lancaster, California. The three-blade main rotor had long-life metal blades with a demonstrated life of over 20,000 hours in lab tests. (Photo courtesy Wikipedia) |
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| Sikorsky S-55B at St Albert Aerodrome, Alberta in 1984. The S-55 received American civil type approval on 25 March 1952 and the model with the Pratt & Whitney R-1340 engines became the S-55A, while the version with the Wright engine was designated S-55B. (Wikipedia photo) |
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| Sikorsky UH-19 at the Canadian Museum of Flight 1988. The aircraft is painted as it would have looked while being used on the construction of the Mid-Canada Radar line. (Wikipedia photo) |
Credits and References:1) CWWH photo http://en.wikipedia.org/wiki/File:SikorskyS-55C-GWWH.JPG
2) Mid Canada Line photo http://en.wikipedia.org/wiki/File:S-55MidCanadaLine.JPG
3) http://www.aviastar.org/helicopters_eng/sik_s-55.php
4) Ian MacCorquodale <maccdale(at)hotmail.com>