Days of Thunder

Posted: December 1, 2010 in Marine

Cummins-powered Thunder Jet in action on Sydney harbour

The latest thrill-seeker jet boat on Sydney Harbour is, not surprisingly, from the Tasmanian boat-building works of Greg Lynd.‘Thunder Jet’ is the seventh Cummins-powered boat built by Lynd’s company, Lyndcraft Boats, for high-speed – 40 knot – thrill rides.

Two of the seven are operating overseas – one in Greece, the other in the US Virgin Islands – and they won’t be the last Lyndcraft jet boats to head to foreign waters.

“There’s a lot of interest in our thrill-seeker jet boats from overseas companies involved in the tourism industry,” says Greg Lynd.

He makes no secret of the fact that the 5.9-litre Cummins QSB engine is crucial to the success of the Lyndcraft boat.

‘Thunder Jet’ is propelled by dual 350 hp QSB electronic engines – a potent installation in terms of power density. Hamilton Jet waterjets complete the propulsion package. 

“The power-to-weight ratio of the Cummins QSB is unbeatable in this application, and the engine’s governed setting of 2800 rpm ideally suits the Hamilton jet impellor,” says Lynd.

“I tell anyone who is looking at buying one of these jet boats that I can’t guarantee the performance with an engine other than the Cummins QSB.”

The Lyndcraft design has certainly proved itself in the thrill-seeker market. The first boat went into service in early 2002 with Oz Jet on Sydney Harbour, a company that now operates three units.

All but one of the Lyndcraft boats built to date are 9.0-metre, 24-seater versions with the dual 5.9-litre Cummins installation. The other is a 6.0-metre, 12-seater with a single QSB engine.

Ex-truckie Greg Lynd began building aluminium boats in 1999 under the Lyndcraft brand. His operation is based at St Helens, a fishing town in the north-east corner of Tasmania.

 “Our boats range in size from 3.6-metre dinghies to 15.0-metre patrol boats,” he points out. “We’ve put over 30 Cummins engines into work boats since we started out.”

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