Trelleborg Industrial AVS replaces engine mounts on round-the-world trimaran
Trelleborg Industrial AVS has designed and donated a new engine mounting system to cope with the massive forces anticipated during the “Earthrace” round the world record-breaking attempt, which starts from Valencia, Spain on 1st March.
Earthrace is a 78ft wave-piercing trimaran that runs exclusively on 100% biodiesel and has a net zero carbon footprint. It is powered by two Cummins MerCruiser Diesel QSC8.3-540 diesels, each mounted on four Metalastik® Cushyfloat® HT™ high-performance elastomeric engine mounts. The current world speed record is 75 days and was set by Cable and Wireless Adventurer (GB) in 1998. The new record attempt will travel via the Azores, Puerto Rico, Panama Canal, Manzanillo, San Diego, Hawaii, Marshall Islands, Palau, Singapore, Kochi, Salalah, Suez Canal and back to Valencia. The original mounting system proved inadequate during the course of last year’s initial record attempt, which had to be abandoned due to extreme weather in the Mediterranean. The solution proposed by Trelleborg Industrial AVS was a conventional four-point mounting system based on the new Metalastik® HT™ (High Thrust) Cushyfloat®, which has been specifically designed for higher thrust loading and higher torque output of modern marine engines. The rubber element of the Metalastik® HT™ Cushyfloat® is precisely configured to combine a relatively high degree of flexibility in the vertical and lateral modes, together with good longitudinal stiffness fore and aft. This means excellent vibration isolation properties with minimum movement under thrust forces. Metalastik® HT™ Cushyfloat® incorporates bump and rebound control features to limit excessive movement under shock and a corrosion-resistant metal cover to protect the rubber against oil contamination. Trelleborg Industrial AVS offers the Metalastik® HT™ Cushyfloat® in two basic designs and a variety of rubber compounds to accommodate loads from 85 to 900 kg. Earthrace is a not-for-profit project led by skipper Pete Bethune (NZ) and with volunteers providing the crew and back-up. The boat itself was designed and built in New Zealand by Calibre Boats, using carbon/kevlar composites. It has a maximum speed of 40 knots, can carry 3,000 gallons (11,500 litres) of fuel and has a range of 14,000 nm at 6 knots. It is designed to take up to 24ft (7metres) of water on top of the windscreen and the wave piercing is controlled by pumping up to 2.5 tons of water into a special ballast tank in the bow. The more water in the bow and the faster the boat is travelling, the more effectively it pierces the waves.