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Aviation History
1938
1938 - 0824.PDF
290 FLIGHT. MARCH 24, 1938. (Left) The Pobjoy Niagara V in its «shell." Note themounting of the carburettor on top of the rear cover. "Flight" photograph. (Above) The De Havilland Gipsy Major I, here seen in a Leopard Moth, runs for 1,000 hours between overhauls. and exhaust valves are on opposite sides of the heads aud are operated by twin camshafts, oue each side of the engiue. Good reports were given of a Miles Whit- ney Straight fitted with Maya engine. Makers: Villiers-Hay Development Co., Albemarle Street, London, W.i. Weir SUBJECT to official confirmation, theWeir inverted four-cylinder engine recently passed its type-tests, completing in all something over ioo hours running and giving 70 h.p. at 2,900 r.p.m. The firm are at present too busy with aircraft work to put the engine into pro- duction, but one will be installed in their first experimental helicopter, which is now under construction, and should bring vertical flight one step nearer for the private owner.—Makers: G. and J. Weir, Ltd., Cathcart. Glasgow, 5.4. LIGHT AERO ENGINE DATA Two fuel pumps are mounted side by side at the rear of the Cirrus Major 150. The neat enclosure of push rods and rockers is shown. The Scott Flying Squirrel is a good example of two-stroke simplicity. Chromidium steel liners are encased in cylinders of light alloy. Maker's Name ami Engine Type. Alvis: Anzani: Armstrong SMctoy : (ienet Major 1 A... Lynx IV C Cheetah IX Cheetah X, v.p ****: British 8alitiMM : A.D.9 K Caunter : Chitton : Carden-Ford Cirrus (B'aekburn) • Minor Major lad Coventry Victor: . Oe Havilland : Gipsy Major I ... Gipsy Major II, v.p. Gipsy Six I Gipsy Six II, v.p. J.A.P.: Pobiov; Niagara III Niagara V Seott: Villier; Hay: Weir: No. and Arrange- ment of Cyls. 9 R. 2 I.V. 7 K. 7K. 7R. 7R. 4H*O. 9R. 4 I.L. 4 I.. -1 l.L. 4 I.L. 4H.O. 4 l.L. 4 I.L. 6 I.L. OI.L. 2H.O. 7R. 7K. 2 I.L. 4 I.L. 4 l.L. Cool- ing. A. A. A. A. A. A. A. A. A. \V. A. A. A. A. A. A. A. A. A. A. A. A. A. Bore and 8troke. mm. 120x112 83x101.5 108v 114.3 127x139.7 133.3 X 139.7 133.3x130.7 • 83 X 81) 73 X 8li 82x11)0 03.5 x 02.5 ft X 127 120x140 85 x 80 118x140 118x140 118x140 118x140 114.3x101.6 77x8781x87 73x78 120.6x114.3 80x100 Capa- city. litres. 11.78 1.10 7.32 12.4 13.65 13.65 1,731 3.23 2.1 1.172 3.00 C.:« 1.50 0.124 0.124 9.186 9.186 1.86 2.833.1 0.65 5.21 2.00 Com- pression Ratio. 6.3 5.5 ,t 5 6.35 6.35 10.2 0 — CO 5.8 5.8 0.7 5.25 0 5.23 0 5.2 r, 8.5 6.8 0 5.5 Normal Engine Speed. r.p.m. 3,000 2,500 2,200 1,900 2,100 2,300 5,000 3,000 — 3,300 2,300 2,200 2,600 2,100 2,400 2,100 2,400 2,400 3,300 3,701) 3,200 2,300 2,300 Nor- mal Power. b.h.p. 375 20 ISO 213 310 340 80 80 — 30 82 138 27 120 130 185 185 34 88 100 16 120 45 Max. Powftf. b.h.p. 35 105 240 330 350 - 81) OO 32 90 150 40 130 14)) 200 205 40 !>.'» 13'/ 28 135 70 Max. Take- off Power. b.h.p. 425 30 1:58 240 340 375 - 73 51 30 70 132 33 120 140 185 205 34 UH 28 113 50 Wght 1b. 100 327 515 635 6y4 130 188 120 141 227 325 130 SIX' 305 450 4i;y 115 156 1"5 85 275 112 R. ~ Radial. 1. — Inverted. A. = Air V'. - Vet formation. H.O = Horizontally opposed. IV. = Water. v.p. •= Variable Pitch a^scrrw. t. -•
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