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More Powerful and Easier to Drive
Page 99
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ANEW range of heavy-duty 6. x .6 chassis is being produced by Scammell Lorries, Ltd. To be known as the Super Constructor seriei, the Vehicles have more powerful engines, the option of semi-autOmatic transMission, coilspring front suspension, a " safety " braking system and greater cab space when .compared with the normal Constructor models. A modified automatic :oupling gear for medium-duty prime movers is also announced.
The new Super. Constructors are to be made available with a variety of wheelbases and their gross weight ratings are the same as for the Constructor models up to 75 tons with a semi-trailer, up to 150 tons with a drawbar trailer, or, in a [ong-wheelbase version, as a carrier for 30-ton indivisible loads. Leftor • righthand drive is available. The normal Constructor range remains in production with i Rolls-Royce 185 b.h.p engine or the Leyland 150 b.h.p. unit.
There is a choice of power units: the Albion-Leyland 0.900 15.2-litre oil engine, which develops 230 b.h.p. at 1,900 ep.m. and gives a maximum torque out put of 704 lb.-ft. at 1,400. r.p.m,, is standard. As an option, the Rolls-Royce C6S 12.17-litre supercharged oil engine may be fitted, this being rated for a maximum output of 250 b.h.p.
The Albion-Leyland engine has a dual exhaust system, leading into a common silencer box, and a new type of radiator has been developed to cope with the extra engine power. This is pressurized to 5 p.s.i. and is wider and lower than normal Scammell radiators, thus improving forward vision.
When the 0.900 unit is installed it carries a Fluid rive type 550 hydraulic coupling and from this a short card an
shaft takes the drive to a Self-Changing Gears RV30semi-automatic eight-speed epicYclic gearbox. The change-speed mechanism has been specially developed by Scammell Lorries and it operates by air pressure.
The cOntrol. lever is carried on the steering column and forward ratios are engaged by moving the lever forward. It returns to a central position after each change. Similarly, the two reverse ratios and downward changes are made by moving the lever backwards. A pointer on a circular dial shows which gear is engaged.
Several safety features are incorpo. ratcd, including a cut-out switch which ensures that, the engine may not be started unless the gear is in neutral; an overriding speed control which prevents downward changes when the engine speed exceeds 1,500 r.p.m.; and a neutral stop which prevents the accidental selection of neutral by making it necessary to push the change-speed lever inwards before neutral can be engaged.
A representative of The Commercial Motor last week drove a Super Constructor with this new gear and it was -found to make an outstanding difference to the road performance. It gave the driver more positive control and relieved him of the anxiety of having to select the correct gear ratio well before ascending a gradient or entering a corner. This will ensure higher average speeds in service, besides making life more pleasant for the driver.
The Super Constructor at the Show will have a new form of front suspension, which has coil springs in place of the
transverse leaf spring normally fitted. There are two coil springs, one at each end of a beam which is centrally pivoted to the chassis frame.
Concentric with the springs are heavyduty dampers, and location is provided by triangulated radius arms and a Panhard rod. The new suspension has been developed primarily to give a better ride at high speeds over dirt roads and desert tracks; but this is in fact afforded under all conditions of operation.
Othei innovations applied to the Super Constructor . concern a greater steering lock; the use of a hydraulic steering servo which is more compact than the air servo previously specified; and a new type of air-pressure braking system which in• effect gives three independent• circuits when a trailer is being towed.
Alternative Gearbox As an alternative to the Self-Changing Gears RV30 semi-automatic gearbox, a Z.F. six-speed constant-mesh unit may be specified, in which case a conventional clutch is employed. In standard form this Z.F. box is used without an auxiliary section, as with the RV30, but to obtain maximum tractive 'effort a two-speed epicyclie auxiliary gear can be supplied
as an optional extra.
The Rolls-Royce 250-b.h.p. engine is available with either of these transmissions, and carries a 16-in.-diameter twinplate clutch. As with the Albion-Leyland 0.900 engine, it has a four-point mounting, and because of the longer bonnet none of the engine intrudes into the cab.
The modifications to the former M.H. coupling gear have been carried out to make it easy to fit and adapt to chassis and to make operation lighter. The improvements include a vacuum-servooperated coupling hook, controlled by a small trigger in the cab, and a lever controlling the semi-trailer brake servo, which supplants the former mechanically operated layout.
The rigidity of the coupling-gear assembly has been increased by using a box-section cross-member and diagonal stays at the ramps. The new gear is known as the Scarnmell Mark It automatic coupling gear.