Looking back at the Technical Specification and Requirements for this “military-style” RIB I am struck again by the apparent conflict between the various dimensional, operational, structural, performance and stability/buoyancy parameters. Let’s just say that this is another boat which is on the limit of what is possible within the given set of constraints which are often technically & practically challenging.
Nevertheless we have manage to achieve a vessel which is capable of well over 50 knots whilst carrying a full complement of 12 PAX plus requisite operational equipment and full fuel load of 1200 litres. In addition this vessel complies with the stability, buoyancy, watertightness and load capacity requirements equivalent to an ISO category “B” rating as well complying with the structural requirements for a ISO Category VIII “Offshore Inflatable Vessel”. So all in all this is one tough vessel which is very fast and very seaworthy (offshore capable).
As you can see from the accompanying GA the crew and passengers are all seated on high quality shock-mitigating seating from Shockwave Seats, Sidney, B.C. In this case the aft console is also a Shockwave proprietary design which was custom built for this vessel.
The other major feature of this RIB is the inflatable D-collar, chosen specifically to increase the deck space given the overall beam restriction. Together with Kanter Marine Inc, Ontario (who did another fantastic job on the construction of this vessel) we at DVDesign have now explored, and pretty much perfected, both D-tubes and also fully circular inflatable tube sections in the 10 plus designs we have collaborated on since 2007. Note that we use the term “collar” and “tube” interchangeably.
As with all of our RIB designs over 7 metres in length the inflatable collars are above the static waterline (by 100 to 250mm) for several specific reasons. Firstly the vessel remains stable should the inflatable collar inadvertently become damaged and deflate. In other words the vessel is not dependant on the collars for buoyancy or stability. Secondly the collars do not drag in the water, reducing the chances of damage, improving handling/cornering and also eliminating tube vibration arising from water flowing over the tubes. If you have spent time in RIB’s which drag their tubes at speed you will know what I mean. Lastly, the placement of the tubes vertically allows for a proper (ie compliant) height of the wet deck above the waterline at all loading states which vary by almost 2000 kg from the minimum operating condition to the full load condition. In order to comply with ISO buoyancy and cockpit drainage rules the wet deck has to be a minimum height above the DWL…..this is an important safety factor which lacking in many RIB design found today.
Two more features of this vessel which deserve a mention are the pivoting Radar mount on the Arch and also the rounded of bow shape in the plan view. The latter was conceived to facilitate coming alongside larger vessel during interdiction operations. There’s less chance of damaging the inflatable collar on the backing structure when sandwiched or squeezed between the two vessels. The Radar Mount is well raised to eliminate the chances of any crew getting irradiated from the transmitter, whilst at the same time folding away to comply with road height restrictions.
So all in all a complicated yet very capable package which is imminently suitable for Special Operations, Interdiction, Patrol, Rescue and Personnel Transfer. The first vessel built to this design was launched in late 2011 and is deployed in N.S. in Canada.
10.41 metres – (34′ 2″)
DWL - 8.71 metres (28′ 7″)
3.30 metres – (11′ 11″)
Deadrise - 24°
Displacement – Half Load ~ 5400 kg (11905 lbs)
Power - Triple 300Hp Four-Stroke Outboard Motors
Fuel Capacity - 1200 litres (317 USG)
Hull Material - 5083 H116/H321 Marine-grade Aluminium Alloy