The new, open-decked boat is of a similar design to its predecessor while featuring the latest on board systems and meeting all current workboat codes and regulations. It is the first vessel of its class to be built to new MCA rules for small workboats.

Wickham Marine built the vessel using an innovative jig system which effectively created a 'mould' in which the steel hulled vessel was built. The build method means that the vessel is constructed from the outside in, with the hull structure built first before equipment and systems are installed rather than the more traditional keel laying or modular construction. The method requires considerably more work when building the first hull but makes the construction of subsequent vessels, using precisely measured CNC machined steel plates, extremely time and cost efficient. Wickham did not charge the PLA for vessel design on the basis that it (Wickham Marine) would retain the right to market the product more widely.

The new vessel features robust construction with 6mm shell plating and very heavy lateral framing to protect it against crushing when operating between vessel hulls and wharves or when handling wires for the 'mother' salvage ship.

The open deck and side-mounted control console enables maximum use to be made of the deck and also allows wires to run the length of the vessel without being snagged on any superstructure - a requirement when operating with salvage ship wires.

The UK manufactured Cat 3056NA (naturally aspirated) engine, rated 125bhp at 2,600rpm, features a sealed keel cooling system which eliminates the problem of cooling water inlet filters being blocked by the silt and other debris in the River Thames.

This has been a considerable problem for the PLA with its existing vessels. The engine is also supplied with a PTO shaft and three groove pulley, a 1.5" bilge pump and is configured for a dry, multi-position exhaust outlet.

Although speed is not a major requirement, the new cutter's 10 knot cruising speed, compared to its predecessor's 6 knots, in a river that can have a tidal flow of 4 knots, will be welcomed by its operators.

MJ Information No: 17229