This design was commissioned by the AMF Boat Co. in Tauranga, NZ in their bid to provide a solution to the needs of one of the local coastguard units. Our design was chosen and the end result (launched in late September 2005) is proving very successful in all respects.
AMF came up with the term Quick Response Vessel and hence the abbreviation in the name. Our target speed was 40 knots and this has been achieved. So far we have reached 42.5 knots during the seatrials with some fine tuning yet to be completed. As with most jet drive installations the boat is highly manoeuvrable, even in shallow water due to the reduced draft. The first boat will be launched and retrieved from a beach trailer which is further facilitated by the lack of protruding appendages.
The hull form is reasonably standard with moderate deadrise and an easy riding entry. The waterline beam is kept to a minimum to lower the overall resistance whilst still providing adequate deck space. Power is from a single Yanmar 440 Hp diesel driving a Hamilton 274 jet. Initial reports indicate that the boat is very stable, rides level and easily in a chop and does not exhibit any tendency to “porpoise” at all. Unlike many other RIB’s we have paid particular attention to keeping the collar (tubes, bag) out of the water to reduce drag. The collar is not needed for stability, flotation or to improve planing. Because we have achieved a proper CG location the collar does not drag in the water at any speed, and perhaps only marginally in close quarters manoeuvring. Ultimately this collar should last longer than usual and require less maintenance due to the reduced hydrodynamic loading.
Hull, deck and cabin construction is of marine grade aluminium alloy with Hypalon chosen for the bag material. As usual AMF have done their reputation no harm in the build quality achieved. Their workmanship is legendary and this time the result is no different.
The hardtop is open aft but provides more than adequate protection for the crew. Foam padded backrests (with handrails incorporated) rather than seats are provided for the crew. A nice touch from the builders is the inclusion of foam padding under the decktread of the crew deck, increasing the comfort for the crew whilst standing in transit. The cabin forward has seats on each side with storage under which will accommodate four to six people seated or two lying down. Note the large forehatch from which a crew member can work the foredeck.
Although designed specifically with rescue services in mind I believe that we now have a platform which can be adapted for other purposes eg. Piloting and harbour services, patrol and research vessel applications etc. The attached general arrangement drawing and photo’s will further give an idea of the capabilities of this unique boat.
LOA - 8.92 m (29′ 3″)
DWL - 7.23 m (23′ 9″)
Beam - 2.87 m (9′ 5″)
Beam (Alloy) - 2.36m (7’ 9”)
Draught - 0.425 m (1′ 5″)
Deadrise - 18°
Displacement - 3000 Kg (6614 lbs)
Power - Yanmar 6LY2A STP (440 Hp) driving Hamilton 274 Jet
Speed - 40 Knots
Fuel Capacity - 330 litres (87 Gallons)