THE MISSIONTHE MISSION
Offshore cruising, Survival up to sea state 9+Offshore cruising, Survival up to sea state 9+ Cutter-rigged sailing vesselCutter-rigged sailing vessel Classical aestheticsClassical aesthetics Crew of seven; Watch team of twoCrew of seven; Watch team of two Newest technology and systemsNewest technology and systems
Traditional style… Modern convenienceTraditional style… Modern convenience
Parametric AnalysisParametric Analysis
Based on Full Keel vessels of 38’- 50’ Based on Full Keel vessels of 38’- 50’ LWLLWL
39 vessels used:39 vessels used: 15 between 60’ and 70’ LOA15 between 60’ and 70’ LOA 9 between 45’ and 50’ LWL9 between 45’ and 50’ LWL
Parametric AnalysisParametric Analysis
Stormy Weather
Brilliant
Parametric AnalysisParametric AnalysisDisplacement to Length Ratio
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
30.00 35.00 40.00 45.00 50.00 55.00 60.00LWL (ft)
D/L
Parametric AnalysisParametric Analysis
Length to Beam
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
30.00 35.00 40.00 45.00 50.00 55.00 60.00 65.00 70.00
LWL (ft)
Bea
m (
ft)
Parametric AnalysisParametric Analysis
Displacement to Draft
5.005.506.006.507.007.508.008.509.009.50
10.00
10000 30000 50000 70000 90000 110000 130000Displacement
draf
t (ft)
Parametric AnalysisParametric Analysis
Sail Area to Displacement Ratio
0.00
5.00
10.00
15.00
20.00
25.00
30.00
15000 35000 55000 75000 95000 115000
Displacement (lb)
SA
/Dis
p
Principal DimensionsPrincipal Dimensions
Principal Dimensions and Ratios
LOA 62.5' L/Δ Ratio 264.69
LWL 46.25' SA 2186 ft2
Sailing WL 48.20' SA/ Δ Ratio 21.51
B 15' BHP 97 hp
T 8.3' Cp 0.59
Δ 71808 lb Cb 0.19
Cm 0.35
Cwp 0.64
Awp 444
PrincipalPrincipal DimensionsDimensions
Performance Estimation
Capsize screening factor 1.45 (<2.0 is good)
motion discomfort ratio 58.41 range 30-60
overhang ratio 0.26
Waterplane loading Coefficient 161.73 lb/ft2
hull speed est. 9.11 kt
ballast ratio 27.85 %
HULL CHARACTERISTICSHULL CHARACTERISTICS
Graceful OverhangsGraceful Overhangs
Sharp EndsSharp Ends
Smooth sheer lineSmooth sheer line
Low profile good for seakeepingLow profile good for seakeeping
Lines/ Hull ModelLines/ Hull Model
Weights and CentersWeights and Centers
Full LoadFull Load
Total weight: 71,808.97 lbs Total weight: 71,808.97 lbs
32.06 LT 32.06 LT
LCG (aft of FP): 33.09 ftLCG (aft of FP): 33.09 ft TCG (+=stbd of CL): 0.009 ftTCG (+=stbd of CL): 0.009 ft VCG: 6.9 ftVCG: 6.9 ft
WeightsWeights andand CentersCenters
Light ShipLight Ship
Total weight: 65,571.2 lbs Total weight: 65,571.2 lbs
29.273 LT 29.273 LT
LCG (aft of FP): 40.17 ftLCG (aft of FP): 40.17 ft TCG (+=stbd of CL): 0.466 ftTCG (+=stbd of CL): 0.466 ft VCG: 6.9 ftVCG: 6.9 ft
RosamundaRosamunda WeightWeight CurveCurve
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
-55152535455565
Feet from FP (+ Aft)
Dis
trib
ute
d W
eig
ht
(LT
/ft)
Displacement =
LCG =
32.06
33.09
LT
ft aft FP
Intact StabilityIntact Stability Limit of Positive Stability: Limit of Positive Stability: 130 deg130 deg
Intact Righting Arm Curve
-2
-1
0
1
2
3
4
5
0 20 40 60 80 100 120 140 160
Degrees of Hee l
Rig
hti
ng
Arm
(ft
)
Based on GHS modelBased on GHS model
Outboard ProfileOutboard Profile
Inboard ProfileInboard Profile
Deck PlanDeck Plan
General ArrangementsGeneral Arrangements
Comfort at sea and in portComfort at sea and in port
Adequate sea berths Adequate sea berths
Good natural light and ventilationGood natural light and ventilation
FunctionalityFunctionality
General ArrangementsGeneral Arrangements
General ArrangementsGeneral Arrangements
Deck PlanDeck Plan
Goals are to provide the following:Goals are to provide the following: Ease of movement on deckEase of movement on deck SafetySafety Comfortable cockpit for both in port and at Comfortable cockpit for both in port and at
sea usesea use Good visibilityGood visibility Preserving the look and feel of a traditional Preserving the look and feel of a traditional
yachtyacht
Deck PlanDeck Plan
MODERN CONVENIENCE:MODERN CONVENIENCE: Self Tailing multi speed winchesSelf Tailing multi speed winches Cockpit led controlsCockpit led controls Travelers for main and staysailTravelers for main and staysail Easy opening low profile hatchesEasy opening low profile hatches Electronic displays for Navigation and Electronic displays for Navigation and
performanceperformance
STUCTURESSTUCTURES
BUILT To Lloyd’s BUILT To Lloyd’s Rules and Regulations Rules and Regulations for the Classification of Yachts (1979)for the Classification of Yachts (1979)
ISAF Special Regulations CATEGORY 1 ISAF Special Regulations CATEGORY 1 MonohullMonohull
STRUCTURESSTRUCTURES
RIG DESIGNRIG DESIGN
Fractional Cutter RigFractional Cutter Rig
Carbon Fiber Tapered Carbon Fiber Tapered SparSpar
Two Spreaders, no Two Spreaders, no running- back staysrunning- back stays
Double LowersDouble Lowers 1x19 wire shrouds1x19 wire shrouds
Rig DesignRig Design 78’ above DWL78’ above DWL
31’ Carbon/ Epoxy Boom w/ Spruce Veneer- finished 31’ Carbon/ Epoxy Boom w/ Spruce Veneer- finished brightbright
1122 ft1122 ft22 mainsail mainsail
Staysail= 380 ftStaysail= 380 ft2 2
Jib= 684ftJib= 684ft22
Total Sail Area= 2186 ftTotal Sail Area= 2186 ft2 2
SA/ Disp. Ratio= 21.51SA/ Disp. Ratio= 21.51
VELOCITY PREDICTION PROGRAMVELOCITY PREDICTION PROGRAM
PCSAIL 2.05PCSAIL 2.05
Based on Delft 93 seriesBased on Delft 93 series EXCEL-based Velocity Prediction ProgramEXCEL-based Velocity Prediction Program 5-speeds (6,9,12,16,20 kts)5-speeds (6,9,12,16,20 kts) 35 wind angles35 wind angles Calculates VMG, Apparent Boat Speed Calculates VMG, Apparent Boat Speed
and, Rand, RRR
SAIL POLARSSAIL POLARS
RESISTANCE CURVERESISTANCE CURVE
PROPULSION DETAILSPROPULSION DETAILS
Yanmar 4JH3-THE diesel engineYanmar 4JH3-THE diesel engine Four-stroke, vertical, water-cooledFour-stroke, vertical, water-cooled Rated for 97 BHP @ 3800 rpmRated for 97 BHP @ 3800 rpm ZF30M Mechanical Multi-plate clutchZF30M Mechanical Multi-plate clutch 563 lbs. in dry state563 lbs. in dry state Meets BSO II, SAV & EMC std. Meets BSO II, SAV & EMC std.
compliancecompliance
Propulsion DetailsPropulsion Details
ElectricalElectrical SystemSystem Generator: Onan 7 kWGenerator: Onan 7 kW
5 12V Sealed Marine Batteries5 12V Sealed Marine Batteries
110/220 V AC110/220 V AC 12V DC12V DC
Shore-power hookupShore-power hookup
Built-in Battery Charger/AlternatorBuilt-in Battery Charger/Alternator
PipingPiping
Reverse Osmosis Fresh Water MakerReverse Osmosis Fresh Water Maker
2-175 gal potable water tanks2-175 gal potable water tanks
250 gal diesel fuel tank250 gal diesel fuel tank
2- 30 gal holding tanks2- 30 gal holding tanks
Automatic and Manual Bilge PumpsAutomatic and Manual Bilge Pumps
RudderRudder andand SteeringSteering
Steering Gear: Edson Steering Gear: Edson Robinson Worm Gear Robinson Worm Gear model #380-2model #380-2
2.5” Diameter Carbon 2.5” Diameter Carbon Rudder PostRudder Post
Rudder Data:Rudder Data: Area= 19.55 ftArea= 19.55 ft2 2
Center of Effort= 2.7’ Center of Effort= 2.7’ above BLabove BL
Design Load= 5046 lb Design Load= 5046 lb with FOS of 3with FOS of 3
FurtherFurther IterationsIterations Engine Side Access and Spacing too tight to be Engine Side Access and Spacing too tight to be
practical for maintenance practical for maintenance Correct ByCorrect By
• Increase Shaft AngleIncrease Shaft Angle• Raise Engine in HullRaise Engine in Hull• Move Engine Forward Move Engine Forward
Center of Effort- Lead too smallCenter of Effort- Lead too small Correct by:Correct by:
• Shifting Mast Forward one DiameterShifting Mast Forward one Diameter• Shifting Keel BackShifting Keel Back• Raising Jib Forestay Raising Jib Forestay
QUESTIONS?QUESTIONS?