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Aviation History
1956
1956 - 1222.PDF
368 FLIGHT President. It would have been difficult to bestow a more fitting name on this civil development of the Pembroke, for Hunting Percival foresee it especially as an executive aircraft. In this form, indeed, it will make its first appearance in the S.B.A.C. Display this year. The aircraft is equally attractive as a feeder-liner, or for charter work, for which operation it can be fitted with up to 12 seats. The aircraft has scope, too, as a freighter and for special work such as photographic survey—this being the form in which a number of the President's Prince forebears are operating. The President is actually the civilian counterpart of the military Pembroke, and is backed by six years of military flying with the R.A.F., Fleet Air Arm, and other forces. A useful commercial attribute is the unusual capaciousness of the cabin—unusual at least for an aircraft of this size: the cabin is a completely unobstructed volume measuring 20ft by 5ft 6in wide by 6ft lin high, with a door 5ft 2in high by 4ft 2iri wide close to the ground. The two Alvis Leonides engines have been extensively proved in service all over the world, particularly in the arduous training role (e.g., as fitted to the Provost), and the President's short-field performance, particularly on one engine, is remarkably good. The total usable fuel capacity of the President, with the S.B.A.C. allowances, gives a still-air range of 1,030 statute miles at an economical cruising speed of 150 m.p.h. This distance can be increased to 1,500 statute miles by the fitting of underwing slipper tanks. Over shorter distances the President can maintain a speed of up to 220 m.p.h. at maximum rich-mixture settings and has a service ceiling of 22,000ft. Pembroke. The Pembroke is a general-purpose military transport able to operate at full load from small—and even unprepared—airfields in climates as diverse as those of Finland, Aden and Malaya. With up to ten rearward-facing seats it is used for communica- tions work or for freighting. The cabin space (seats removed) measures 20ft lin in length, 5ft 6in in width, and 6ft in height. For the dropping of supplies—for which the removal of the two main doors leaves an opening 4ft 2in wide and 5ft 2in high—the Pembroke is well suited. Casualty evacuation is yet another application, for which the machine is fitted with six stretchers; and for multi-engine pilot-training, dual controls and amber screens can be installed. With a forward-facing oblique camera in a transparent nose the Pembroke becomes a survey machine of notable merit. There is provision, too, for vertical and side-facing oblique cameras in the cabin. As a flying classroom it carries radar or radio operators, bomb-aimers or navigators, with appropriate equipment. The makers take especial pride in the Pembroke's performance on one engine. In the event of a failure on take-off it will get away on one Leonides and, in the cruise configuration, with flaps and undercarriage retracted, will cruise at full load on one engine at maximum continuous power np to heights of over 6,000ft. Powerplant ..Span LengthGross weight Max. speed .. AM* Leonldet... 64ft 6in 46ft... 12,8001b 220 m.p.h. Drawing and data for Pembroke C.I; photograph is of Survey Pembroke
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