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SAFEHAVEN MARINE. Builders of the Interceptor & Wildcat range of offshore craft
THE WILDCAT UNLEASHED!
FULL ROUGH WEATHER SEAKEEPING REPORT
INTRODUCTION TO THE VESSEL
The Wildcat has been designed from the beginning to combine safe
dependable sea keeping and stability with performance and economy. The Wildcat
hull design utilises symmetrical planning hulls. Symmetrical hull shapes were
chosen for their directional stability in short, steep swell conditions in
following and quartering seas. The hulls are multi chine in form. The main chine
deflects water out and away form the hulls having a two-fold effect. On the
outboard chine this improves ride dryness and reduces wetted area. On the
inboard chine the spray is turned so that in waves it provides a cushion effect.
The spray is mixed with air coming down the tunnel and creates a high-density
medium, which dampens motions through waves. The likelihood of slamming on the
bridge deck is virtually eliminated as a result of the hull riding on this
high-density spray cushion. A second chine situated 200mm higher than the main
chine and further aids in boat dryness, especially at lower speeds when the main
chine is mainly immersed.
keels are incorporated, and provide protection to the propellers, as well as
increasing the hulls grip on the water for slow drift speeds.
vessels beam has been constrained to a wide 15ft 6”, providing a good
compromise between work area, stability, and minimal slamming that tends occurs
on catamarans that have a very wide bridge deck. Also marina space and berthing
facilities are considered, where excessive beam can be hard to facilitate.
Due to the
slender nature of the Wildcat’s hulls, in choppy conditions vertical
accelerations are much reduced in comparison with a mono hull’s, giving a
gentle ride and motion. However previously the biggest disadvantage of the older
type of catamaran hull, which featured very fine sections fwd with little
reserve buoyancy, giving a very smooth ride in short sea states but suffering
badly in ocean swell conditions due to slamming on the bridge deck. This
shortcoming has been solved with much fuller fwd sections, offering greater
buoyancy and giving the hull the necessary lift to prevent slamming on the
bridge deck, allowing higher speeds
to be maintained into larger ocean swells. In following seas the Catamaran has a
distinct advantage, the twin hulls form a ‘grove’ in the water allowing the
hull to track as if on rails whilst the tremendous transverse stability means
the hull suffers little yaw and surge, especially in quartering seas allowing
virtually ‘hands off steering’.
The Wildcat has a very large flush aft cockpit. The walkway up each side of the cabin is wide enough for two persons to pass each other and at the fore deck, mooring and anchoring is easily and safely carried out. The anchor locker is very large and incorporated in to the superstructure, forming a comfortable seat as well. Accommodation on the vessel is to a good standard, being lined and carpeted, and constructed in a combination of teak and GRP mouldings. The helm console is central in the cabin and offers excellent visibility. Either side is standing room with doors leading down to the fore cabins in each hull, which feature a reasonably sized V berth. There is a large galley to st/bd with sink, strainer and gas hop with plenty of sliding drawers and lockers below. Opposite to port is a very comfortable curved settee with a folding table. The heads compartment is accessed from the aft cockpit and usefully, can be hosed down. The two engines are situated below large flush hatches which feature very wide and deep 5” x 6” drainage channels and several outlets, which should ensure zero water finds its way below decks.
With 8 vessels now in commercial service the design has proved very successful with exceptional sea keeping capabilities and performance.
SEE 'JO DAN IV' Another Wildcat Catamaran. (pictured below)
Click here to see our new 2004 Model 'Motor Yacht version' of the Wildcat (shown below)
From these photos a good idea of the Wildcats stunning lines can be appreciated. The hulls swooping sheer line combines with her raked stem to make her form graceful, yet with a hint of aggression. She is set to become the most attractive Cat around. Studying the hulls you can see there is plenty of buoyancy in the hulls f/wd sections, which combined with the high bridge deck should ensure excellent sea keeping with out the slamming of waves on the bridge deck, a problem suffered by some of the older generation of cats, (pre south boat). Seen below, the first fully completed Wildcat.
The Island wheelhouse design of the superstructure gives a huge amount of gunwale space allowing anglers to spread out resulting in less tangles. Access all around the boat is greatly improved over conventional cabin designs making the Wildcat very easy and safe to operate.
The Interior is fitted out to a high standard with a fully lined and carpeted main cabin incorporating GRP mouldings and strong solid teak woodwork. Access f/wd down in to each hull where there is a V berth and full standing headroom.
A comfortable settee and fold away table gives relaxed seating.
The large galley with sink and drainer, gas hop and several useful pull out cabinets and drawers.
Propellers run in tunnels and are fully protected by skegs. Easily beached.
The toilet is accessed directly from the aft cockpit, giving easy access for passengers and can be hosed down!
Engines are situated below large flush hatches with large 4x6" drainage channels, 4x 2" drains and a heavily reinforced hatch raised and lowered by hydraulic hatch lifters.
The WILDCAT'S beam can be appreciated here, alongside our Interceptor 38 which has a fairly typical 12ft beam.
36FT / 10.7M
15FT 9” / 4.8M
2FT 10 / .9M
8,550KG LIGHT / 10,500KG LOADED
WILDCAT 107 LAY UP SCHEDULE
& SCANTLING SPECIFICATION.
GENERAL BUILD CONSTRUCTION
AND VESSEL SPECIFICATION
TO LSSC RULES CLASSIFICATION FOR WORKBOAT G2
following construction details apply on craft
used for sea angling operating in favourable conditions, General build and
scantlings in accordance with Lloyds
Special Service Craft Rules / Standards for
a maximum operational speed of 16kts on an operational displacement of 10500kg
(14 persons) in sea conditions as outlined below.
speed ( kts )
Max significant wave height ( m/ft )
4.0 / 12.8
3.5 / 11.2
2.9 / 9.5
2.5 / 8.2
1.8 / 5.9
1.3 / 4.2
laminate schedule / lay up wts -
using isophthalic resin. Composite
CSM.. 800gm2 WR. 900gm2 CSM. 800gm2 WR. 900gm2
shell laminate Bottom -
4600gm2 / 16oz
using Isophthalic resin.
800gm2 WR. 900gm2 CSM.
3200gm2 / 13oz
- Keel. Additional layers extending min 300mm from
keel across bottom. Each layer stepped back 25mm.
- 5600gm2 / 19oz
colouring agent used in lay up.
longer than 24 hrs between layers to ensure chemical bond.
after cure of main laminate & whilst still in mould the following stiffening
is bonded -
frames- 100mm x 100mm
@ 790mm centers. Max panel
dimensions, bottom - 250mm x 690mm .
side - 250mm x 690mm. (measured between stiffeners)
span, bottom - 0.50m. side - 0.5m.
2100gm2 laminate fw/d frames. Lay up: 300CSM. 900CSM, 900CSM
Longditudal girders -
Main longditudals foam cored 100mm
x 800mm. Lay up: 900gm2csm,
800WR, 900gm2csm laminate overlap150mm.
longditudal panel breaker / stiffener
circular foam cored panel breakers 60mm base used in forward hull bottom panel
to reduce panel width. Lay up- 900csm, 900csm, 800WR
( giving a max panel width over bottom of 285mm)
side stringers / pannel breakers
semi circular panel breakers positioned on the side shell out board to give max
panel width of 250mm.
girders - Wood
cored (multiple layers plywood laminated together) 200mm
D x 100mm H. 2700gm2 laminate
extending 300mm min & staggered.
–3 Transverse bulkheads as per drawings
constructed from ½ ”/ 12mm plywood overlaid 600gm2 per side. Additional
collision b/head in bow.
plywood, gell coated bottom, encapsulated 900gm2 top. Supported on
4”x2” Transverse deck beams @ 16”/400mm centres. Bulkheads notched to
receive and bonded. Multiple vertical support beams & webs as per drawing.
Deck shelf wood cored as per drawing and bonded to hull 1800 gm2.
moulding of 2100gm2 - 3600gm2 laminate. Additional wood cored stiffening
overlaid 1800gm2. Internal partition bulkheads & wood work (seating, lockers
etc ) forming additional stiffening to structure. All glassed into
superstructure using 1800gm2 laminate with min50-75mm angles. White flow coat on
bolted to hull using 6mm c/sunk bolts @ 6” centres. 900gm2 laminate to bond
superstructure to hull.
section attached to deck with 6” angles, 1800gm2 laminate, bolted through deck
with reverse flange @ 12” centres.
Lloyds approved GRP materials (resin & glass) used in the construction of
hull. Details provided.
openings & hatches.
compartment. GRP flush deck engine hatch with 100x 100mm large drainage channels
and 2x s/s locking mechanisms closing on watertight rubber seals, 2x hydraulic
rams or 2 electric lifters
to rudder - GRP watertight
hatch. With drainage channel, 2 hinges and one locking mechanism
to fuel shut off Circular 200mm
brass water tight hatch.
Air Intake - Air intake opening
300mm above deck level.
Caterpillar 3126 rated at 300hp each, diesel. Twin disc
1.5:1 gear box. All installation completed. All fuel lines fitted in 10mm
copper with fuel shut off valve & Vetus
primary filters / water separators on feed lines. Engine water intake sea
cocks & vetus water strainers
using fire proof pipe to connect to engine.
stern supplied by CLEMENTS ENGINEERING gear using 1 ¾” T met shafts. Deep sea
seals. Flexible R & D couplings.
Pendant hung balanced rudders with emergency steering square.
blade 21” dia equipoise
engine installation angle 3-4 degrees
angle 9 degrees.
tip clearance 12%
Wet exhaust systems, straight through 6”
pipe with vetus transom outlets and non return flaps.
steering system MTP52R helm pump & MTC125 ram, 10mm copper pipe work,
flexible section to ram, By pass valve.
no 1 ½” manual bilge pumps with diverter valves serving each individual
compartment. Additional electric bilge pump with high level alarm in engine
GRP aft cockpit
gunwale incorporating . 75 x 45 mm h/d rubber fendering all round.
6mm toughened glass, clamp in type. Escape hatch in foreword cabin. Opening s/bd
bulkhead door -
H/D Plastic door & frame, locking, outward
opening. 300mm sill height.
H/D plastic door
& frame, locking, outward opening. 300mm sill height. Accessed from aft
arrangement consists two fore cabin,
one in each hull with two V berths with, toilet compartment situated in main
cabin accessed from aft deck. Galley
situated to st/bd behind helm Main cabin layout has central helm with CAB 300
series hydraulic sprung helm seat on GRP pedestal incorporating storage locker.
Dinette seating and table between
with option of converting to double berth, storage space under seats. Storage
space with work top and lockers to port and st/bd in fore cabin
main cabin wood & trim in matt varnished teak as per standard
drawings. Seat cushions in buttoned vinyl. All interior GRP surfaces in main
cabin fully lined with light grey carpet. Rubber non slip matting on cabin sole.
compartment with door accessed from aft deck.
Two burner hob,
fitted to galley unit comprising laminated work top, storage shelf
with lockers below, Shelf above
work top, Cup holder on bulkhead. External mounted gas bottle supply point
inside dedicated locker. Gas alarm fitted. Stainless steel sink unit with
pressurised water system served from water calorifier with hot and cold water,
12 gallon vetus water tank fitted and plumbing completed.
Fuel tanks are to be constructed of 12mm plastic, baffled to provide a
max un-baffled volume per tank of 20
Each tank has a capacity of 125 gallons.
Each tank will serve one engine.
tank will have a shut off valve on the main supply line capable by either its
positioning or by cable operation be capable of being close manually from
outside the engine compartment.
Copper fuel line used except for flexible connection to engine
FUEL TANKS ARE LOCATED IN A SEPARATE WATERTIGHT COMPARTMENT TO THE ENGINES
Three separate, 12 volt battery banks,
for (a) Engine, (b) Services & (c) Bow thruster. Each are charged from a 90
Amp Alternator via a compensated ‘split diode’ charge distribution system.
Three separate battery isolation
switches are provided in a protected and accessible position along with three
inline main fuses.
thermal breaker distribution board, enclosed in a none corrosive panel to
Separate Voltmeters for service and
engine battery banks.
Engine, fuel tank, propeller ‘A’
bracket and rudder stock bonded to anode with 6 square cable and soldered cable
Aqua Signal navigation lights series
Deck flood light to marine standard,
with stainless steel brackets. (optional)
Engine control panel ( type depending
of engine manufacturer).
Electric bilge pump with ‘hand –
off – auto’ panel switch.
level alarm with audible and visual indication.
and engine room lighting.
marine window wiper.
lighting, switched locally
pressurised domestic water system.
Full electronic fit for communication
and navigational systems to customer requirements.
Emergency standby VHF battery and
isolated charging system.(Dept of the marine
for fishing vessels with DSC radios.).
Shore power connection with
distribution board and outlets.
Mains ‘switch mode’ battery
On board entertainment system.
Voltage Inverter to requirements.
Cabin heating and window demister.
locker Positioned in bow forward of collision bulkhead with hatch, self draining
Mooring arrangements -
Large bow bolard, 2 x midship cleats, 2 x stern
from 1” / 25mm mirror polished 316
grade stainless steel. All railings in passenger area at 1000mm height with
chain closure of all gaps.
5ft ‘A’ frame type constructed from 1 ½”
/ 38mm 316 grade mirror polished stainless steel with, anchor light and mounting
point for radar.
GRP moulding , 2x Vetus seats on aluminium pedestals. Dual steering and
engine controls. Access ladder constructed from 1 ½” 316 S/S with aluminium
tread plate on steps. Railings constructed from 1” 316 s/s.
protection in the engine compartment.
construction used in shell laminate alternating between CSM and Woven rovings.
In any case the final layer in the engine compartment to be of 600gm2 Woven
the event of fire in the engine room the following provisions are made to
engine compartment is served by two automatic or remote (as applicable) fire
extinguishers of sufficient volume to starve a engine room fire of air and
extinguish the fire. Manually operated flaps on the air vents close off air
supply to the engine compartment.
DRANING AND FREEBOARD.
Freeboard is .750mm
aft cockpit has four scuppers of sufficient size to adequately drain the cockpit
from any green seas and spray.
gas installation comprises a dedicated sealed gas storage locker venting
overboard situated in the aft cockpit. This supplies the cooker via a 10mm
copper pipe, securely clipped and routed. A second shut off valve is fitted at
the vicinity of the cooker.
gas alarm is optionally fitted to
the vessel with the sensor positioned in the bilge.