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Aviation History
1935
1935 - 0062.PDF
3« FLIGHT. JANUARY IO, 1935. FOR FAST COMMERCIAL TRANSPORT The Airspeed " Overseas Models with "Lynx IV. C" Engines : A Wide Choice of Equipment and a High Performance KNOWN as the "Overseas Model," an improved version of the "Envoy" has recently been produced at the Ports mouth works of Airspeed, Ltd. It is fitted with two " Lynx 1V.C " engines (240 h.p. at 2,090 r.p.m.), which give a top speed of 174 m.p.h. Basically, this " Envoy " is practically identical with that built for the late Mr. C. T. Ulm, and differs' but little from the Wolseley-engined '' Envoy '' which was described in Flight of July 12, 1934- The cabin of this new model can be arranged either as a six- or eight- seater, and the performance in general consider ably surpasses that of the previous machine. Certain structural alterations to the centre sec tion of the wing have enabled the all-up weight to be increased to 5,850 lb., which means that, despite the extra weight of the larger engines, a usefully large payload is still permissible, with a long range. The well-known Airspeed retractab.3 under carriage is retained, and behind the engines are fairings very similar to those placed behind the "Cheetah" engines in the "Viceroy," which Capt. Stack flew in the England-Australia Air Race. The leading edge of the outer portions of the wings has now been completely covered with plywood extending from the top of the front spar around the leading edge to the bottom of the front spar, thus making a structure both rigid in torsion and so strong that it will not be damaged when pushed against while man handling the machine. The cabin upholstery A side view of the " Lynx "-engined "Envoy" R. K. Dundas Ltd. are the Airspeed agents. Flight Photographs, i The "Overseas Envoy" with its Townend ring-cowled "Lynxes. DATA—AIRSPEED "OVERSEAS MODEL" Tare weight (8-seaier) 3,780 lb. (1 712 kg) Tare weight, plus pilot (1701b.) (77 kg) 3,850 lb. (7 789.3 kg) Petrol consumption per hour ... ... ... ... 24 gall. (10!)!) Oil consumption per hour ... . 3.5 to 6 pint (2-3.3 1) Maximum speed at sea level ... ... ... ... ... ... 174 m.p.h. (280 km'h) Maximum speed at 5,000ft. (7 524 m) 170 „ (273 „ ) Maximum speed at 10,000ft. (3 048 m) 160 „ (267 „ ) Take-ofl run, 5 m.p.h. (8 kmjh) wind 270 yd. (247 m) Landing run, 5 m.p.h. (8 Am/A) wind, with brakes 240 yd. (279 m) Cruising speed ... 153 m.p.h. (246 km! h) ... Landing speed ... 64 „ (103km'h\ Rate of climb at sea level 1,070 ft./min. (5.4 mlset) Service ceiling 16,500ft. (5,020 m) PAYLOAD AT VARIOUS RANGES. 1 Range (miles) ... Fuel (gallons) ... Oil (gallons) pull load . load < I load ... at 200 (321 km) 31 (1411) 6 (27 1) 1,600 (725 kg) 1,125 (510 kg) 1 | load ... 1 — Standard Tanks. 300 (482 km) 47 (2141) 7 (32 I) 1,471 667.kg) 996 (452 kg) — 400 (644 km) 63 (286 I) 8 (361) 1,340 (608 kg) 865 (392 kg) — *638 (7 028 km) 100 (454 I) 10 (45 1) 1,031 468 kg) 556 (252 kg) Extra Tanks. 800 (7 287 km) 125 (568 1) 12 (541) 820 372 kg) 345 (756 kg) — 1 — 1,000 (7 609 km) 157 (714 I) 14 (641) 559 253 kg) 84 38 kg) — All-up Weight :>.K.,II (2 654 kg) 5,375 (2 438 ftg) — Note.—If wireless is installed the weight must be deducted from the payload. * Maximum range with standard tanks at cruising speed.
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