BUILD SPECIFICATION
WILDCAT
36.
Fully completed craft- Angling / Dive version
Introduction
to the vessel
Design
and specification
Principle
dimensions
Lay
up schedule hull
Construction
Superstructure
Deck
openings and hatches
Engineering
Bilge
pump arrangements
Gunwale
Windows
Cabin
b/head door
Toilet
door
Interior
Toilet
compartment
Galley
Fuel
tank
Electrics
Anchor
locker
Mooring
arrangements
Railings
Mast
Fire
fighting equipment
Fire
protection
Cockpit
draining and freeboard
Gas
installation
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.
Full-length
keels are incorporated, and provide protection to the propellers, as well as
increasing the hulls grip on the water for slow drift speeds.
The
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.
VESSEL
DIMENSIONS
L.O.A.
36FT / 10.7M
BEAM
15FT 9” / 4.8M
DRAFT
2FT 10 / .9M
DISPLACMENT-
8,550KG
LIGHT / 10,500KG LOADED
FREEBOARD
-
MIN 750mm
WILDCAT 107 LAY UP SCHEDULE & SCANTLING
SPECIFICATION.
GENERAL BUILD CONSTRUCTION AND VESSEL
SPECIFICATION
TO LSSC RULES CLASSIFICATION FOR WORKBOAT G2
The
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.
Allowable
speed ( kts )
Max significant wave height ( m/ft )
10.0
4.0 / 12.8
12.0
3.5 / 11.2
13.0
2.9 / 9.5
14.0
2.5 / 8.2
16.0
1.8 / 5.9
18.0
1.3 / 4.2
Fitted with twin 300hp Caterpillar engines- 25kts.
Fitted with twin 440hp Yanmar engines- 32kts
Hull
laminate schedule / lay up wts -
300gm2
using isophthalic resin. Composite
as follows-
900gm2
CSM.. 800gm2 WR. 900gm2 CSM. 800gm2 WR. 900gm2
Total
shell laminate Bottom -
4600gm2 / 16oz
300gm2
using Isophthalic resin.
900gm2CSM.
800gm2 WR. 900gm2 CSM.
800gm2 WR
Sides -
3200gm2 / 13oz
Reinforcement
- Keel. Additional layers extending min 300mm from
keel across bottom. Each layer stepped back 25mm.
Keel
- 5600gm2 / 19oz
No
colouring agent used in lay up.
No
longer than 24 hrs between layers to ensure chemical bond.
Immediately
after cure of main laminate & whilst still in mould the following stiffening
is bonded -
Transverse
frames- 100mm x 100mm
@ 790mm centers. Max panel
dimensions, bottom - 250mm x 690mm .
side - 250mm x 690mm. (measured between stiffeners)
Max
span, bottom - 0.50m. side - 0.5m.
2100gm2 laminate fw/d frames. Lay up: 300CSM. 900CSM, 900CSM
Main
Longditudal girders -
Main longditudals foam cored 100mm
x 800mm. Lay up: 900gm2csm,
800WR, 900gm2csm laminate overlap150mm.
Secondary
longditudal panel breaker / stiffener
Semi
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)
Additional
side stringers / pannel breakers
60mm
semi circular panel breakers positioned on the side shell out board to give max
panel width of 250mm.
Engine
girders - Wood
cored (multiple layers plywood laminated together) 200mm
D x 100mm H. 2700gm2 laminate
extending 300mm min & staggered.
Bulkheads
–3 Transverse bulkheads as per drawings
constructed from ½ ”/ 12mm plywood overlaid 600gm2 per side. Additional
collision b/head in bow.
Deck
½“
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.
Superstructure.
GRP
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
external surfaces.
Superstructure
bolted to hull using 6mm c/sunk bolts @ 6” centres. 900gm2 laminate to bond
superstructure to hull.
Wheelhouse
section attached to deck with 6” angles, 1800gm2 laminate, bolted through deck
with reverse flange @ 12” centres.
Materials
-
All
Lloyds approved GRP materials (resin & glass) used in the construction of
hull. Details provided.
Deck
openings & hatches.
Engine
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
Access
to rudder - GRP watertight
hatch. With drainage channel, 2 hinges and one locking mechanism
Access
to fuel shut off Circular 200mm
brass water tight hatch.
Engine
Air Intake - Air intake opening
300mm above deck level.
Engineering
-
·
Engine –Twin PERKINS SABRE or equivalent
300hp diesel engines, ZF 1.5:1 gear
box. All installation completed. All fuel lines fitted in 15mm 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.
·
Conventional
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.
4
blade 21” dia equipoise
propellers.
Max
engine installation angle 5 degrees
Shaft
angle 12 degrees.
Propeller
tip clearance 15%
Wet exhaust systems, straight through 6” pipe with vetus transom
outlets and non return flaps.
·
Vetus hydraulic steering system MTP52R helm
pump & MTC125 ram, 10mm copper pipe work, flexible section to ram, By pass
valve.
Bilge
pumping arrangements.
8
no 1 ½” manual bilge pumps with diverter valves serving each individual
compartment. Additional electric bilge pump with high level alarm in engine
compartments.
Gunwale
-
·
GRP aft cockpit gunwale incorporating . 75 x 45
mm h/d rubber fendering all round.
Windows
-
·
Aluminium framed 6mm toughened glass, clamp in
type. Escape hatch in foreword cabin. Opening s/bd side window.
Cabin
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 deck.
Interior
-
·
General arrangement consists two forecabins,
one in hull, with two V berths and a large storage are above the bridge deck.
The fore cabin area is flow coated white or grey. Toilet compartment situated in
main cabin accessed from aft deck. A
full 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
All
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.
Toilet
compartment -
·
Separate compartment with door accessed from
aft deck.
Galley
-
·
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
tank -
FUEL
TANKS
Fuel tanks are to be constructed of 12mm plastic, baffled to provide a
max un-baffled volume
per tank of 20 gallons.
Each tank has a capacity of 125 gallons.
Each tank will serve one engine.
Each
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.
15mm
Copper fuel line used except for flexible connection to engine
THE
FUEL TANKS ARE LOCATED IN A SEPARATE WATERTIGHT COMPARTMENT TO THE ENGINES
ELECTRICS
BASIC
ELECTRICAL SPECIFICATION
1.
Three separate, 12 volt battery banks,
for (a) Engine, (b) Services & (c) Bow thruster. (optional if fitted) Each
are charged from a 90 Amp Alternator via a compensated ‘split diode’ charge
distribution system.
2.
Three separate battery isolation
switches are provided in a protected and accessible position along with three
inline main fuses.
3.
A 12
thermal breaker distribution board, enclosed in a none corrosive panel to
IP65.
4.
Separate Voltmeters for service and
engine battery banks.
5.
Engine, fuel tank, propeller ‘A’
bracket and rudder stock bonded to anode with 6 square cable and soldered cable
lugs.
6.
Aqua Signal navigation lights series
55.
7.
Deck flood light to marine standard,
with stainless steel brackets. (optional)
8.
Engine control panel ( type depending
of engine manufacturer).
9.
Electric bilge pump with ‘hand –
off – auto’ panel switch.
10.
Bilge
level alarm with audible and visual indication.
11.
Hold
and engine room lighting.
12.
Single
marine window wiper.
13.
Cabin
lighting, switched locally
14.
Electric
pressurised domestic water system.
Optional
Additional extras.
1.
Full electronic fit for communication
and navigational systems to customer requirements.
2.
Emergency standby VHF battery and
isolated charging system.(Dept of the marine
requirement for fishing
vessels with DSC radios.).
3.
Shore power connection with
distribution board and outlets.
4.
Mains ‘switch mode’ battery
charging facilities.
5.
On board entertainment system.
6.
Voltage Inverter to requirements.
7.
Cabin heating and window demister.
8.
Microwave.
9.
Night lighting.
Anchor
locker
Anchor
locker Positioned in bow forward of collision bulkhead with hatch, self draining
Mooring arrangements -
·
Large bow bolard, 2 x midship cleats, 2 x stern
bolards.
Railings
-
Constructed
from 1” / 25mm mirror polished 316
grade stainless steel. All railings in passenger area at 1000mm height with
chain closure of all gaps.
Mast
-
·
5ft ‘A’ frame type constructed from 1 ½”
/ 38mm 316 grade mirror polished stainless steel with, anchor light and mounting
point for radar.
Fire
fighting
Fire
protection in the engine compartment.
Composite
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
Rovings.
In
the event of fire in the engine room the following provisions are made to
prevent flooding.
The
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.
COCKPIT
DRANING AND FREEBOARD.
Minimum
Freeboard is .750mm
The
aft cockpit has four scuppers of sufficient size to adequately drain the cockpit
from any green seas and spray.
GAS
INSTALATION.
The
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.
A
gas alarm is optionally fitted to
the vessel with the sensor positioned in the bilge.