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lybrids take the mat off army trucks
Page 16
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lectric hybrids power the perfect shoot scoot vehicles. US company Stewart & tevenson tells CM why they are the basis fits bid for a fi.4bn defence contract.
by Steve Banner
ictric hybrid drives are play, a key part in military truck sign. So says Ted McQuinn, wly-appointed UK managing .ector of Stewart & ivenson Tactical Vehicle stems (S&S TVS). The US mpany S currently pitching
• a £1.4bn contract to supply er 8,200 trucks to the nistry of Defence in conjuncn with LDV—McQuinn is sed at LDV's Birmingham mt—Multidrive, and Lex fence.
Since 1991, S&S TVS has en the exclusive supplier of 3dium tactical vehicles to the > army, and has built over ,500 vehicles. "It was the need improve fuel economy that st prompted interest in what !ctric hybrids have to offer," Quinn explains. "They cernly lead to better economy on high density stop/start cycle, d electric hybrids are particarly useful as stationary iwer generators for cornand/control systems.
"But they're especially valuile as HIMARS (High Mobility iillery Rocket System) platrms," he continues. "That's ?cause they can sit quietly thout putting out a heat signare, monitor what's going on, e a salvo of missiles, then use ittery power to go hide someace else."
;hoot and scoot'
lie refer to it as 'shoot and :not'," says S&S TVS market; director, David Lombard. MARS can be mounted on the ucks the company makes, anc e whole package can be transrted in a 0-130 cargo aircraft. Working with Allison, among others, S&S TVS has built electric hybrid demonstrators, and even constructed a hydraulic hybrid that uses hydraulic accumulators rather than batteries.
"Batteries are expensive and heavy," Lombardi points out. Known as Permo-Drive, the hydraulic hybrid is said to cut fuel consumption by 35%.
McQuinn believes that the MoD could benefit from these and other technologies if it so wishes. "We've got it all there for them to draw on," he observes. "All we've got to do is turn around and pick it up." They include a recently introduced vehicle-mounted hook-arm load handling system with British links. "It's capable of handling an Bftx8ftx20ft ISO container weighing eight tonnes, and we developed it in conjunction with Partek Cargotec of the UK," says Lombardi. "We worked with them for around 18 months."
S&S builds trailers as well as trucks, and the load handling system is designed to be used by a truck/trailer combination. It has developed 2.5 and 5.0tonne single and tandem-axle trailers with the same off-road capability as the all-wheel-drive FMTV Al truck that tows them.
"We've built the trailers in such a way that, if a truck is capable of covering an off-road course at, say, 25mph, then it