Leyland Comet

First generation

The semi-bonneted original Comet was first shown in December 1947. While intended mainly for export, it was also sold in the home market. The wheelbase is 17.5 ft (5.3 m) and the gross weight 8.75 long tons (8,890 kg). A coach model seating 33, sharing the same front design, appeared in 1948. The body was built by Briggs Motor Bodies and was shared with the Ford Thames ET6 and Dodge 100. Ford purchased Briggs in 1953, meaning Leyland (and Dodge) were forced to develop new bodies. The original engines were a 75 hp (56 kW) diesel or a 100 hp (75 kW) petrol unit; the petrol version was rarely seen in Britain.

In 1950 the diesel engine was updated to the new 5.76 litre Leyland O.350 unit, now with 90 hp (67 kW). Maximum weight was increased to 12 long tons (12,200 kg); models for tropical zones received a considerably lower rating. In 1955 the maximum power output was increased again, to 100 hp (75 kW) at 2200 rpm, as the new O.350 Mk. III engine replaced the previous version.

Second generation

In 1952 a cab over version of the Comet became available. This was sold next to the bonneted model until 1955/56, depending on the market. As for the bonneted version, power from the Leyland O.350 engine went from 90 to 100 hp (67 to 75 kW) in 1955. This model continued in production until 1958, although Australian models continued to use this cab into the early 1960s. This model also entered production in India after having received government approval in 1951. Ashok Motors, Ashok Leyland after 1954, manufactured it locally. The original front clip design remained in use into the early 1970s. Ashok Leyland proceeded to develop a simplified local cab design and continued to build the Comet into the 1990s.

Third generation

In 1958, as part of an effectivization program, the Comet received a new cab - called the "Vista Vue" cab, it was developed by Albion for a variety of their models. Dodge UK also used it for their 300 model, consequently this cabin shape is often referred to as the "LAD" design. There was also a heavier duty "Super Comet" model introduced, which eventually largely supplanted the "regular" Comet.

Fourth generation

Introduced in 1964, the fourth generation Comet used the Ergomatic cab, as also used by a number of other Leyland models and other British truck manufacturers of the period.

Fifth generation

After a decade and a half in retirement, the "Comet" label was reintroduced in 1986. Again, the model was intended specifically for export markets (primarily in the developing world), with simplified equipment, fewer gears, and a sturdy construction. The design is an all-metal version of the C44 Roadrunner, again simplified in order to make local assembly easier. The design consists of six major pressings, and was designed so as to allow for hand welding on a simple jig. The chassis is made of straight rails. The six-wheeled version is called the "Super Comet". The Comet was part of a new rationalised range and replaced the Terrier, Boxer, Reiver, Landmaster, and Clydesdale models - although there was some resistance to retiring these classic model names in markets where they had a good reputation. Leyland's previous "export special", the Landmaster, had been of a bonneted design, but Leyland determined that the bonneted design was becoming less favored across developing markets.

Models ranging from 9 to 13 long tons (9,100 to 13,200 kg) received the 115 hp (86 kW) 6-98 NV engine. The 14 long tons (14,200 kg) has the 140 hp (100 kW) Leyland 402, while the heavier 16 long tons (16,300 kg) model and the Super Comets have the 160 hp (120 kW) Leyland 411. With only five speeds, the top speed of a 1986 12-tonne Comet is a mere 54 mph (87 km/h), but this was more than sufficient for conditions in the markets targeted. The primary markets intended for the Comet were English-speaking countries in Sub-Saharan Africa and also some Middle Eastern markets. The Caribbean, Latin America, and Singapore were also to receive some Comets.