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6th November 1923
Page 19
Page 20
Page 19, 6th November 1923 — FURTHER DETAILS OF THE 25-cwt KARRIER.
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A Carefully -Designed, High-speed Chassis on Pneumatic Tyres with Worm Drive and Powerful Brakes.

IN OUR previous issue we gave certaM particulars and line illustrations

of the new Karrier chassis built to carry a gross load of 33 cwt., or a net load of 20-25 cwt., when fitted with a body, weighing not more than 8 cwt. We have now inspected and had a test run on the chassis, and are able to include further details and illustrations.

What struck us first was the high quality of the production at what is a comparatively reasonable price, and it has been built to meet the needs of those who have previously been catered for chiefly by the foreign manufacturer, and in this respect it will assist in meeting a long-felt want.

The 11.A.C. rating of the engine is 18.2 h.p. It has cylinders of 31 ins. bore and 5 ins, stroke, and the power generated certainly appears to be ample, as, carrying its full load, the vehicle has been timed to reach 40 m.p.h.

During our test, which was over a short stretch of .very hilly country, we reached 32 m.p.h. on a slight upgradient, and were given adequate proof of the efficiency both of the transmission

arrest the loaded vehicle in a. powerful but smooth manner, and without any of that chattering which is sometimes apparent.

The engine gave rapid acceleration and powerful pulling, without knocking, at, slow, speed on top gear. This is perhaps due to the efficient design of the combustion chambers, which give satisfactory turbulence of the gases, and the fitting of the sparking plugs at an angle over the inlet valves.

With its good springing and single pneumatic tyres, the riding qualities were excellent.

Accessibility has been studied throughout, and it is interesting to note that each set of four-valve tappets can be removed in one block by taking out two small setscrews and one large.

The steering is somewhat unusual, the gear, which is situated at the bottom of the column, being of the epicyclic type. The arm moves through an arc 3n a plane at right angles to the column, and the drag link passes across the chassis behind the axle to the near side of the steering connection, to is attached, thus obviating the use of a

double steering arm on the near-side stub axle. Bail joints are utilized throughout, and to provide easy steering the stub-axle pins are canted forward very slightly to give a castoring effect.

The engine and gearbox unit is supported by a fulcrum at the forward end and by arms cast with the flywheel housing at the other, the gearbox being attached to, and projecting from, this housing without the necessity for further support.

Aehind the gearbox is the transmission brake drum, and to this is attached direct a double-thickness Hardy joint, whence the drive is through a hollow cardan shaft with fork ends welded on, and a second Hardy joint to an overhead worm gear carried in a horizontal banjo axle built of two pressed-steel sections welded together. Particular attention has been paid to the braking, to the efficiency of which we have already drawn attention. Both brakes are lined with Ferodo.. In the ease of the expanding shoes in the rear wheels the Ferodo is held in position by T-bolts, and can be replaced with the greatest ease. In the case of the transmission brake the section of Ferodo used for each shoe has recesses pressed into it to take the heads of the setscrews by which it is attached to the brake shoes.

There are several neat fittings, including an air compressor driven from the first-speed gearwheel of the gearbox by .a throw-in pinion operated by a lever from the dashboard. The speedometer drive is also out of the ordinary. Use is made of a special end-bearing cap for the worm tailshaft. This carries a skew gear meshing with another on the tailshaft, the drive being through the usual flexible metallic connection.

A feature of interest is the way in which a very large steering lock is obtained without insweeping the frame. To do this the side-members are not parallel, although they are perfectly straight, long cross-members being used at the rear and shorter ones towards the front.

The price of the Z type is £345, with pneumatic tyres and electric-lighting equipm cut.


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