Breakdown version of Unipower Invader
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• Except for some minor changes resulting from development work since its introduction at the 1968 Show, the Unipower Invader 4 x 4 will be exhibited at Earls Court with the same specification as last time. But Universal Power Drives Ltd will feature a new version—the 16-ton-gross model equipped with Dial-Holmes breakdown recovery equipment and fitted with a special low line cab instead of the Motor Panels unit. Another new development to be shown by this maker will be a single-drive rear bogie with four-spring suspension designed primarily for conversion of Leyland Mastiff four-wheelers to 6 x 2 but adaptable for use with most maximum gross two-axle rigid chassis.
The basic specification of the Invader is retained for the breakdown vehicle. This includes the Perkins V8.510, 179 blip vce engine five-speed gearbox and two-speed auxiliary and transfer box. The vehicle has twin power winches for the Dial Homes twin-boom "wrecker" equipment rated for 18 tons but suitable for recovery of vehicles up to 30 tons gross.
Squareand rectangular-section steel tube is used for the cab frame and this is covered with 16 s.w.g. Zintec sheets: driver and passenger are provided with Bostrom sprung seats. A benefit of the low roof line to the cab is that forward winching is possible from the "wrecker" masthead so eliminating the need for a front-mounted winch.
Tyres are changed for this application. Instead of 10.00-20 all round with twin rears, sizes are 12.00— 20 at the front and 18-22.5 singles at the rear.
The new Unipower bogie employs the normal driving axle of the vehicle which is being converted and a Rubery Owen trailing axle. The four-spring suspension is a new lightweight design and stops are fitted on brackets on the frame, above each spring close to the balance beams. The trailing axle is similar to the unit previously used on Unipower conversions but adapted for heavier duty.
When used to convert chassis such as the Mastiff, plated weight goes up from 16 tons to 22 tons provided the wheelbase is an adequate length. Brake system operation of the trailing axle is integrated with that of the bare chassis to ensure satisfactory service, secondary and parking functions. Quoted price of the conversion is 095.