Modern motor life boats
47 Motor Life Boat
First built: 1990 (prototype)
Last built: Still in Production
Number built: currently 117;
Builder: Textron Marine
Displacement: 40,000 lb (18,000 kg)
Length: 47 ft 11 in (15 m)
Beam: 14 ft (4.3 m)
Draft: 4 ft 6 in (1.4 m)
Hull: 5456 marine aluminium *********
Propulsion: Two 435 hp (324 kW) Detroit Diesel engines
Speed: 25 knots (46 km/h) max; 22 knots (41 km/h) cruise
Range: 200 nautical miles (370 km) cruise
Righting capability: Rollover in under 10 seconds
Complement: 4 crew, 5 passengers
The USCG has since designed and built new aluminum 47 foot lifeboats, with Textron Marine and Land Systems awarded the contract to design and build the US model, which was delivered in 1990. After 2 years of testing and evaluation, 5 more were built between 1992 and 1994 incorporating improvements from the prototype model for further testing and evaluation around the country. The first production boat was delivered to the USCG in 1997.
The 47 MLB is the most sophisticated MLB ever built, able to withstand impacts of three times the acceleration of gravity, she can survive a complete roll-over, self-righting in less than 10 seconds with all machinery remaining fully operational. Powered by twin Detroit Diesels producing 435 hp (324 kW) each, the 47 MLB can travel at 25 knots (46 km/h) to reach her destination.
There are currently 117 operational with a total of 200 scheduled to be delivered to the USCG. A further 27 models are being built by MetalCraft Marine under license to the Canadian Coast Guard.
In Britain, the RNLI designed and built three types of all weather motor lifeboats, the Arun class kept permanently afloat, the Tyne class slipway-launched boat and the Mersey class carriage-launched boat. More recently the Arun replacement Trent and Severn class prototype models were delivered in 1992 with the first production Trent arriving in 1994 and the Severn in 1996. The first production Tamar class, replacement for the Tyne went into service in December 2005 and the FCB2 replacement for the Mersey is being developed for deployment in 2007
Great Job !
I guess the Coast Guard thinks aluminum is strong enough for rescue boats ?
Hey they even use them in salt water!