This specification describes the design and construction of the proven reliable, tactically seized, rough sea-going 10.6M aluminium vessel which will be arranged as a Heavy-duty Patrol Craft (hereafter referred to as "vessel") to use in coastal and offshore waters, with equipment and capacities to focus on below missions: Special Ship/boat Boarding, Maritime Counter Hijacking Operation, Exercise on-board Offshore Platform and merchant ship, Landing and recovery of troops, Coastal and offshore patrol, SAR operation, The vessel will be constructed to a high commercial standard with particular attention to minimising noise transference and vibration while enhancing structural rigidity and integrity, and offering best crew comfort and mission-capability. Engines: 2 x SUZUKI DF300 300HP@5700-300RPM. Max. Speed: 38 knots at full load isplacement/100% MCR/Beaufort Scale sea state two/clear hull. Cruising speed: Approx. 30 knots. Range: No less than 100 NM at max. Speed and no less than 130 NM at cruising speed. Compliment: 8 persons. Seakeeping ability: Sea state five Construction: marine grade aluminium Compliance: CE Class B.
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Ex factory, China
34' 9" - 10.60m
3.6m (11ft 9in)m
0.64m (2ft 1in)m
(lightship load) Approx. 4.8 tonnes. T
38 knots at full load displacement/100% MCR/Beaufort Scale sea state two/clear hull
Approx. 30 knots
1 x 700L
Displacement (full load): Approx. 6.1 tonnes
Deadrise(Forward entry): 55-65 deg. Subject to the level of speeds
Range: No less than 100 NM at max. Speed and no less than 130 NM at cruising speed
Compliment: 8 persons
Seakeeping ability: Sea state five
Compliance: CE Class B
1.2 Design and Attributes
I. Vessel Layout:
The vessel is laid out with the hull to include one reinforced anti-collision fore peak tank, one void tank with watertight access hatch for stowage of manual operated anchor and its dedicated nylon rope, one fuel tank compartment and one void space for stowage of service items while the deck is laid out with open console covered by hardtop to accommodate the control station with shock-mitigating seats for fourteen troops/passengers together with lockers under the console station, one deck coaming with vertical hatch-accessed battery installation besides two large-sized gravity draining ports to run through the portside and starboard bottom, and two lockers located inboard of the raised bulwark on the fore deck at the bow as per shown in the GA drawings.
Taking in mind for intention of stable, efficient and long voyage navigation in the special adverse conditions of tropical West African Seas to cater tough mission in Somalia, the vessel is specially laid out with best available ergonomics for improved comfort, better sustained duty-efficiency and capability, highlighted as follows:
The console station is centrally located to offer a flexible platform for a variety of electronics while the fore windows are designed to be forward facing so as to effectively and efficiently stop the burning sun from shining directly onto the dashboard to secure easy and precision data obtaining from the instruments;.
The deck is designed with 360 degree of walk around the whole console, featuring wide side decks and raised deck bulwarks together with grab rails for unrivalled crew maneuvering safety in all handling conditions;
The collar is designed to be heavy-duty, over-sized EVA foam coated with 4mm elastomeric polyurethane, and is to be bonded to the specially moulded D-shaped/half-round installation channel at the gunwale, thus achieving best safety and durability to ensure the highest level of protection to the hull against strong, frequent impact by other vessel in boarding/disembarking;
II. Hull Form
The hull is well proven and will be variable deadrise deep V high performance planing in form, incorporating a fine forward entry, two well immersed and full-length outer tunnels(also called revised reverse chine), extended waterline length, wide chine beam, high freeboard, flared bow above waterline, slightly curved down buttock lines from stern transom till 3/4 of waterline length, down angled and wide chine flats on bottom sides of the mid hull body, giving a softer ride and safer handling with superior stability in all sea conditions, providing high speed maintained in waves while also having the capability to self correct when running in following seas.
III. Seakeeping Ability:
III. I Seakeeping Ability in Head Seas
Seakeeping ability in head seas for any planing hull is dependent on trim angle and deadrise of the V-shaped hull bottom that encounters the wave. In our design, we have given strict control on longitudinal center of buoyancy(Lcb) and Longitudinal center of gravity(Lcg) so that there will be no big change to distance between Lcb and Lcg no matter at displacement speeds or fully planing speeds, making the vessel ride with extremely low trim at the bow, thus the vessel will be able to run much flatter with the forward fine entry formed by approx. 65 deg. Of high deadrise to be always in best effective contact with water to efficiently cut through head seas, ensuring truly soft, smooth, high speed and comfortable riding quality with no significant hull slamming even in high waves.
IV Seakeeping Ability in Following Seas, Side/Quartering Waves
Seakeeping ability of a planing hull in following seas, side/quartering waves is dependent on dynamic stability of the vessel. No matter what type of boat it is, the dynamic stability of the vessel will be subject to the capability of the underwater hull configuration in gripping/locking water so that the tracking course cannot be easily affected by outside factors/forces generated by following seas and side/quartering waves. In order to achieve superior dynamic stability for top quality in safety against steep following seas and side/breaking waves, below trade-offs have been made in the hull form design:
1) Chine flats to be slightly down angled and well immersed into water till 3/4 of waterline length, which will work with the deep V underwater main hull body and the two full-length outer hull tunnels to give superior grip to the water to better enhance the stable tracking capability even in the event of being strongly impacted by breaking waves.