Dennis Trident 2
The Dennis Trident 2 is a 2-axle low-floor double-decker bus chassis originally manufactured by Dennis, which was unveiled in 1997 and replaced the Dennis Arrow. It was built by TransBus after Dennis was incorporated into the group in 2001 (the Dennis brand name was once dropped). From 2004, it was built by Alexander Dennis.
The Trident 2 chassis features a transversely mounted engine on the right side, with the radiator mounted on the left side of the engine compartment. It could be fitted with C-series Euro II engine (later Cummins ISCe Euro III engine), coupled to Voith DIWA or ZF Ecomat gearbox. It was available with Alexander ALX400, Plaxton President and East Lancs Lolyne/Myllennium Lolyne bodywork.
In the first few years of production, the Trident 2 was popular with a large number sold to large bus operators such as Stagecoach, FirstGroup, Travel West Midlands and Lothian Buses. Some Tridents were exported to Ireland (for Dublin Bus) and Spain (for sightseeing operations in Barcelona and Madrid). But later, due to increased competition after the launch of Scania OmniDekka and TransBus being put into administration, the sales of Trident 2 dropped significantly, leaving Stagecoach as its major buyer.
Dennis Trident 3
Dennis Trident 3 (marketed as 3-axle Dennis Trident) (Japanese: デニストライデント3, Denisutoraidento 3), is the first low floor double-decker bus chassis built by Dennis in the United Kingdom, with a large number purchased by bus companies in Hong Kong, Singapore, the United States and Canada.
Design
The Trident 3 chassis was developed from Dennis Lance/Arrow. It had a longitudinally-mounted rear engine, with a radiator mounted on the right hand side of the engine. An auxiliary axle was mounted behind the second axle to cope with the weight at the rear and reduce the rear overhang.
Trident 3 was available in 4 different body lengths: 10.3m, 10.6m, 11.3m and 12m. It could be fitted with Alexander ALX500 or Duple Metsec DM5000 bodywork.
Engine
The engines used for these buses were all manufactured by Cummins. Earlier models use the M11-305E, a 305 hp engine which complies with Euro II standards, or an ISM-330 330 hp engine for the buses delivered to North America.
The M11-305E engine was replaced by the Cummins ISMe Euro III-standard engine in 2001. A 330 hp version (the ISMe330) was used initially, but later models in Hong Kong adopted a 335 hp (ISMe335) version.
Dennis Trident
The Dennis Trident is a low-floor double-decker bus chassis from Dennis Specialist Vehicles. It was available in two versions:
Hawker Siddeley Trident
The Hawker Siddeley HS 121 Trident (originally the de Havilland D.H.121 and the Airco DH 121) was a British short and medium-range airliner. It was the first T-tail rear-engined three-engined jet airliner to be designed. It was also the first airliner to make a blind landing in revenue service in 1965.
The Trident emerged in response to a call by the state-owned British European Airways Corporation (BEA) for a jet airliner for its premier West European routes. BEA had been induced by the government to issue this call despite its unwillingness to buy a large jet fleet. The airline's requirements fluctuated greatly in the 1950s and a decade later evolved radically away from what the Trident could offer. Adherence to BEA's changing specification was widely seen as limiting the Trident's appeal to other airlines and delaying its service entry.
During its gestation, the Trident was also involved in a government drive to rationalise the British aircraft industry. The resulting corporate moves and government interventions contributed to delays causing it to enter service two months after its major competitor, the Boeing 727, losing further potential sales as a result.
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