US NAVY'S - Incat

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Stena Sea Lynx © Gary Davies Maritime Photographic Holyhead Ferry 1 St Columba When commissioned, fuel consumption on the Holyhead to Dun Laoghaire route, 802 deadweight tonne mailships Hibernia and Cambria averaged about 6,000 litres per trip on the 58 nautical miles service (BTC Registry of Ships). This was improved during refits in 1964, burning class B Marine Diesel Oil, a consumption rate of 5,400 Hibernia © Justin Merrigan Collection © Justin Merrigan Collection litres (4.5 tonnes) per trip being achieved at a reduced rating (The Motor Ship). © Glynne Pritchard By comparison, the ships they replaced in 1949 consumed about 70 tonnes of coal per round trip (The Motor Ship). Graphs have been based on single 58 nautical mile crossings Hibernia (1949) Holyhead Ferry 1(1965) St Columba (1977) Stena Sea Lynx (1993) HSS (1996) Incat 112 (2008) Passengers Cars Speed (knots) FUEL (Litres) 2500 500 25000 2250 2000 1750 1500 1250 1000 750 500 250 0 450 400 350 300 250 200 150 100 50 0 40 35 30 25 20 15 10 5 0 Capable speed 40 knots Economical speed 35 knots Economical speed 35 knots 22500 20000 17500 15000 12500 10000 7500 5000 2500 0 Economical speed 35 knots Economical speed 35 knots Hibernia (1949) 30 Incat THE Magazine Issue 36 Holyhead Ferry 1(1965)
In 1965, the route received its first car ferry, the 867 deadweight tonnes Holyhead Ferry 1. Powered by oil-fired steam turbines she consumed 12,600 litres of fuel per crossing. Capacity was 1000 passengers and 150 cars. In 1977 the larger 1945 deadweight tonnes St Columba came along, her diesels burning around 9,600 litres of fuel per crossing at a speed of 19.5 knots. Intensive running with four sailings per day were offered, the ship having capacity for litres a crossing, times were halved and with capacity for 450 passengers and 88 cars the craft operated with a crew of just 20, a fraction of that carried by the conventional ships. In 2009, a 1000-1450 deadweight tonnes 112 metre with capacity for 1200 passengers and 417 cars can comfortably offer up to four round trips per day, with scope to offer five round trips if required, burning around 10,500 tonnes of fuel per crossing at speeds of around 35 knots. But what about the large medium speed Ro-pax vessels we hear you say! On the same route a modern Ro-pax burns around 18,000 litres per crossing. Well yes, they can carry 3,500 metres of freight in addition to passengers, but that is, after all, a very different market. So, as the above clearly demonstrates, efficient Incat high speed Wave Piercing Catamarans are not the so called ‘gas guzzlers’ many would claim them to be. 58 nautical miles Irish Sea crossing 2400 passengers and 335 cars. In 1993, the route’s first High Speed ferry, the first generation 200 deadweight tonnes Incat HSS Up to 1500 passengers: 22,000* - 30,000 litres of fuel per crossing. Incat 112m Up to 1500 passengers: approximately 10,500 litres of fuel per crossing, at 80% MCR. 8 crossings possible. 8 crossings possible. 74 metre Stena Sea Lynx made her debut. Burning around 6,000 Ro-pax Up to 1500 passengers: 18,000 litres of fuel per crossing, at 20 knots. 4 crossings possible. Fast Ferry Benefits Weather Routing Careful attention to passage planning, taking into account the effect of wind, tide, current and wave on the craft can make a huge difference to the amount of fuel used on any given crossing. Over the course of a year, this can make for cost savings in the millions as well as helping the environment. Incat THE Magazine Issue 36 31
Page 1: FUEL ECONOMY & HIGH SPEED CRAFT www
Page 4 and 5: 4 Incat THE Magazine Issue 36
Page 6 and 7: Robert CLIFFORD Incat Chairman C LI
Page 8 and 9: Fast Ferry Benefits Slow + Extra =
Page 10 and 11: Improvements in berthing arrangemen
Page 12 and 13: A Smoother, Cleaner Bottom! Captain
Page 14 and 15: Building Aluminium High Performance
Page 16 and 17: Coregas & WTIA Tradesperson of the
Page 18 and 19: New Engine Targets Power, Economy a
Page 20: Improving exhaust emissions and fue
Page 23 and 24: Water Resistance: Keeping your unde
Page 25 and 26: Economy with a Capital E! Justin Me
Page 27 and 28: If we look at the terminal side fir
Page 29: from Belfast to Stranraer now takes
Page 33 and 34: Custom made solutions from the prim
Page 35: www.amisales.com.au The www.amisale

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