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Aviation History
1946
1946 - 0019.PDF
ESTIMATED CLIMB PERFORMANCE 7VOOO LB. Ml. AT SI 100 soo Joo 400 soo too 700 soo 900 1000 RATE OF CLIMB FT./M1N. IO IS 2O 25 3O TIMC TO HEIOHT- MINUTES. class flagship, recently celebrated her two-millionth flying mile—equivalent to 14,000 hours in the air. Further, it may not be generally .realised that the Sunderland was originally a military development of the "Empire" boat, although we cannot imagine readers of Flight being unaware of the Sunderland's magnificent fighting record with Coastal Command and with the Indian Ocean Air Force of Eastern Air Com- mand, apart from its equally fine record in the hands of Transport Command. Modern Adaptation When regarding the new Seaford, therefore, one must bear in mind its ancestry, and this would alone give the aircraft a right to a place in the sun, for probably no other in the world is the result of such a long and suc- cessful line of basically similar types. The fact that the Seaford is an adaptation—albeit a refined and modernised adaptation—of the Sunderland SHORT SEAFORD DATA Span ... , 112ft. 9iin. Aspect ratio 7.53. Wing area 1,687 sq.t. Wing loading (max.) 44.5 Ib. «q. ft. All-up weight 75,009 Ib. Engine Conditions All-out level (5 min.) lax. cent, power... *lax. cont. W.M. p»wer ... R.P.M. 2.800 2,400 2.400 Boost Ib./sq. in. -i-6 + 1 Altitude ft. 7,000 4,600 8,300 B.H.P. per Eng. 1,775 1,550 1,280 T.A.S. 75,000 Ib. 236 218 206 knots 60,000 Ib. 240 223 213 Stilt Air Range* and Payloadi. (Operating altitude 5,000ft.) Caie A=-24 passengers4-baggage + 1.909 Ib. freight. Case B—36 passengers- -baggage-i- 5,000 Ib. freight. Case C—24 passengers- -baggage-f- 14,600 Ib. freight. Loading Case A B C 1,000 B.H.P. Constant Power (80 per cent. Max. W.M.) A-U.W. 1b. T-O 75.00075,000 75,000 Land 55,765 60,633 66.830 Fuel, gafl. Petrol 2,630 1,941 1,103 Oil 100 90 60 Mean T.A.S. knots 181 179 177 Dura- tion. Hrs. 11.08.1 4.5 Still Air Range. Naut. miles 1,965 1,440 785 (837.5 B.H.P. (50 per cent. T-O power.) A B C 75,000 75,000 75,000 55,740 60,615 66,820 2,600 1.941 1,103 100 90 60 165.5 162.5 160.5 13.25 9.95 5.55 2,175 1,600 875 Max. Petrol Tar*age=3,l90 gall. Night arrangement of starboard half cabin, showing howchair seats and backrests are made up into berths. should be made clear, and although it is primarily a civil boat, there is also a military version. Thus, with the civil adaptation of the Sunderland, there are four distinct versions: (i) the Sunderland; (ii) the civil Sunderland , (iii) the military Seaford, and (iv) the civil Seaford. The civil Sunderland is nothing much more than a military boat sans military equipment, and with seats and furnishings in its place. Conversely, the civil Seaford is a commercial aircraft on basically similar lines to the Sunderland, and the military Seaford thus becomes something of a successor to the Sunderland. We are, however, concerned here only with the civil model of the Seaford, and although the only illustra- tions at present available of actual machines are of the military boat, the effect of deleting the gun turrets, etc., can readily be appreciated by a comparison with the G.A. drawings. The cabin plans will, in addition, make clear the ingenious interior planning which so effectively makes use of all the hull volume whilst, at the same time, ensuring a valuable impression of spaciousness and a high order of comfort. Internal Planning The addition of 3ft. 3m. to the forebody length over that of the Sunderland, and the extra headroom on the after upper deck, have materially assisted in the utilisa- tion of hull space. Provision can be made either for accommodation of 24 passengers day and night, or, alternatively, 36 day passengers, as the six well- appointed cabins—four on the lower deck and two on the upper deck aft—are each capable of seating six or sleeping four. However, when operating the aircraft with 24 day and night passengers, the four lower deck cabins will be used for the normal daytime seating, so permitting the upper deck accommodation to be em- ployed as a lounge and dining room, access to which is by a midship staircase running athwartships. Each cabin has large-area, non-inflammable plastic windows which serve the dual purposes of providing ample natural light in the cabin and giving the passengers a really excellent view from each seat posi- tion—the latter quality, although of great importance as a factor influencing an aircraft's passenger appeal,
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