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Aviation History
1953
1953 - 1137.PDF
m> Power plant 4 D.H. Gipsy Queen Span 71ft 6in Length 45ft 6in Grots weight 11,500 lb Cruising speed 185 m.p.h. (Data, drawing and photograph for Series 2) o Power plant Span Length .. Gross weight Max. speed Alvis Leonides 502/4 48ft 30ft 3in S,ioolb 172 m.p.h. (Photograph, data and. drawing for Series 2) 1 to De Havilland Heron SENSING the need for a simple, economical airliner with a capacity of 14-17 seats, de Havilland developed and produced the Heron as a 100 per cent private venture: no orders had been received when the prototype first flew in 1950. Producton of some 50 Herons for various operators is now well under way (14 had been delivered at the time of writing), and the demand seems likely to continue for several years. Indonesia, France, Japan, Norway, Australia and New Zealand are among the countries where Herons are being or will be used on internal routes; nearer home, one is in service with Airlines (Jersey), Ltd. The Heron 1, with fixed undercarriage, clears 50ft in 685 yd at 12,500 lb gross weight and cruises at 165 m.p.h. Designed for longer stage-lengths, and now in production, the Series 2 has a retractable under-carriage which adds 165 lb to the tare weight but improves cruising speed by 20 m.p.h. Pay load/ range performance of the two versions differs only slightly; a typical example (Series 1) is 660 miles with 2,400 lb. Both types of Heron are powered by four Gipsy Queen 30 Mk 2s of 250 h.p. De Havilland Beaver OVER 500 Beaver bush transports have been produced in the six years which have elapsed since the prototype first flew. Many of these have been L-20 communications versions for the U.S.A.F., although the 500th machine was actually delivered to a civil customer—the vjo\ern- ment of the Falkland Islands. Further Beaver orders seem certain. In recent months, de Havilland (Canada) have evolved the more powerful Series 2 (as illustrated), which has a 550 h.p. Alvis Leonides in place of the standard Wasp Junior of 450 h.p. The improvement in performance is shown by the following comparative data (Series 2 figures in brackets): take-off to 50 ft, 910 ft (700 ft); cruising at 75 per cent power, 141 m.p.h. (155 m.p.h.); landing over 50 ft, 999 ft (760 ft). These figures refer to military versions at weights of 4,900 lb (Series 1) and 4,950 lb (Series 2), with each type carrying a 1,000 lb payload. Present maximum weight approved for both types is 5,100 lb. Endurance, with allowances, is over 6 hr with a 1,000 lb payload. The Beaver's normal complement is a pilot and six passengers. Wheels, floats or skis are optional.
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