THE FIRST NAPIER AERO OIL ENGINE.
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I N the past year or more we have referred several times to the fact that D. Napier and Son, Ltd., London, W.3, had secured a licence from the. German Junkers company to build in this country the Junkers Jumo 4 oil engine for aeroplanes. The company now informs us that one of the Englishbuilt engines, which, in this country, will be called the Culverin, is being sent to the Paris International Aero Exhibition, to be held from November 16-December 2.
This engine is now undergoing Air Ministry tests. It has already been cle-= scribed in The Commercial Motor. It has six vertical cylinders in line, with two pistons per cylinder. There are two crankshafts, one above and one below the cylinder bank. The engine, which is highly efficient, works on the two-stroke cycle and is water-cooled.
The two crankshafts are connected by a train of gears, to any of which the airscrew hub can be fitted. The Jumo 4 has an international rating of 720 b.h.p. at 1,700 crankshaft r.p.m., and the normal airscrew reduction-gear ratio is .6935 to 1, giving the airscrew 1,179 r.p.m. at 1,700 crankshaft apart. The weight of the engine dry, without airscrew hub is about 1,785 lb.
AUTUMN SERVICE TO THE ISLE OF WIGHT.
A LTHOUGH the line run for Rail.(--1 way Air Services, Ltd., between Croydon and the Isle of Wight, officially closed on October 31, it is being continued, at present, by the operating company, Spartan Air Lines, Ltd.
The British Air Navigation Co., Ltd., also emphasizes that the week-end service run by the P.S.I.o.W.A., Ltd., will certainly continue until December 31, and will probably run from January 1 under a new time-table, LONDON-BELFAST-GLASGOW DEVELOPMENT.
THE London-Belfast-Glasgow daily air service of Railway Air Services, Ltd., may be continued right through
the winter. This line was designed primarily for passengers between London and Belfast, and the traffic (mainly of a commercial nature) has continued to be good throughout October.
From November 1 the D.H.86 liners are being used only on the LondonBelfast section, and a Dragon is operating the extension between Belfast and Glasgow., AIR COMME6CE IN LIVERPOOL. iN every way Liverpool is showing a 'quick appreciation of the value of air transport. We learn, that an aviation committee has now been formed by the Liverpool Chamber of Commerce.