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Aviation History
1939
1939 - 0191.PDF
JANUARY 26, 1939 FLIGHT. 79 An impressive view taken from the rear gangway showing how the hull is divided into two decks. The formation of the structure is also in evidence. The turret in the nose is arranged to be retracted rear ward to permit mooring opera tions. This operation is effected" manually. The floor of the front gun position is hinged ; when this is folded down the position may be used for mooring and, when up, the floor acts as a footrest for the gunner. There is a small flap which forms the bomb aimer's seat. Although the prototype Sunderland was fitted with Bristol Pegasus X engines, all the production machines have Pegasus XXIIs. The Pegasus XXII is the latest medium- supercharged unit of the Pegasus range and is rated at 840 h.p. at 4,000ft., the maximum power for all-out level flight being 890 h.p. at 6,500ft. For take-off 1,010 h.p. is available. De Havilland three-bladed two- position variable-pitch airscrews are standard. The engines are installed in standard Bristol long-chord cowlings with nose type single outlet exhaust col lector rings and trailing edge gills. The collector ring on the port inner engine feeds into a long pipe which passes into the main plane and is fitted with a muff type boiler for heating. Electric starters, Duplex fuel pumps and Exactor hydraulic engine controls are standard equipment. A particularly use ful feature is the slow-running cutout system, the engines £j v\ 1 ^ 1 - • "••-"£*ciii •-'fi«M^^3"~*H —5 *' xpa 3Tfcrf ' Flight " photograph. " Flight " photograph. It will be seen in this view that the low turret can be slid back to permit mooring operations.
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