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The article states:

"We chose the same Yanmar 6-LY series 420 hp diesel engines for power. The same model and ratio ZF 2-speed transmissions."
 

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OK, I just read about this boat in this months boating magazine. It's a Don Smith 40ft APTD. A "ruggedized" version of their 42 ft center console fishing boat. It's been chopped down to 40 ft to fit in a C-130 cargo plane, and is powered by twin 440 bhp Yanmars hooked up to a "Power Vent" propulsion system whereby the exhaust is directed into the prop tunnels reducing noise and heat signature. Its got surface piercing propellers set in tunnels beneath the boat. APTD = Advanced Propulsion Technology Demonstrator. It's currently being shown at the MACC (Multi-Agency Craft Conference) held at Naval Amphibious Base Little Creek un Norfolk, Virginia,
 
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