Cape Ann Double- particulars

Cape Ann Double
Technical specs...

Fast, seaworthy tandem cruiser for touring and expeditions.

Cape Ann Double description | MATERIALS

See another example of this Double built by Marc Dilley and also Gallery2 for more photos

Property	English	Units	Metric	Units	Comments
Length Overall	21	ft	6,4	m	length from bow to stern as designed
Beam Overall	27	in	68,5	cm	widest part of kayak
Draft	4.5	in	11,4	cm	baseline to Designed Water Line (DWL)
Volumetric Properties
Displacement	433.3	lb	196,9	kg	at DWL
Volume	6.77	ft^3	191,6	liters	displacement in cubic feet or liters of sea water
Wetted Surface	30.89	ft^2	2,86	m^2	underwater surface area to DWL
LCB	9.83	ft	2,99	m	longitudinal center of buoyancy from x=0
LCB % LWL		%	51,7	%	LCB as a percetage of waterline length from x=0
VCB	2.73	in	6,97	cm	vertical center of buoyancy from baseline
Waterplane Properties
Waterplane area	26.3	ft^2	2,44	m^2	at DWL
LCF	9.81	ft	2,99	m	longitudinal center of flotation from x=0
LCF % LWL		%	51,6	%	LCF as a percetage of waterline length from x=0
LWL	19	ft	5,78	m	length of waterline; same as DWL
BWL	25.5	in	65,1	cm	beam of waterline
Sinkage	140.6	lb/in	25,17	kg/cm	pounds displaced per one inch of sinkage
Form Coefficients (no units, same for metric)
Cb	0.448				block
Cm	0.824				midship
Cp	0.544				prismatic
Cwp	0.649				waterplane
Area/Displacement	8.63				Area / Displacement ratio [ft^2/(ft^3)^2/3]
Length / Beam	8.88				Length / Beam ratio [LWL / BWL]
Miscellaneous
Area of cockpit	3.33	ft^2	0,309	m^2	for cockpit template in plans (small)
Circumference	7	ft	2,13	m	cockpit
Depth in front	14.25	in	36,1	cm	front cockpit
Depth in rear	12.75	in	32,3	cm	front cockpit
Depth in front	12.5	in	31,7	cm	rear cockpit
Depth in rear	11.75	in	29,8	cm	rear cockpit
Cockpit spacing	6.0	in	1,82	cm	center to center
Deck area	36.4	ft^2	3,38	m^2	includes cockpit area
Hull area	44.2	ft^2	4,1	m^2
Loading	Medium to large paddlers, // Recommended max. load - 520lb
x=0 the start of waterline (DWL) at bow

All English units (ft / in) in the plans have a Metric (m / cm) eqivalent !

Material

Wood strips - assumes bead & cove strips

Unit converter

Coverage + 'fudge factor' for waste	Surface area (ft²) (m²)	Total length of 3/4" strips (ft) (m)	Number of 3/4"x 16ft strips	Total length of 5/8" strips (ft) (m)	Number of 5/8"x 16ft strips
Total area of kayak (+ cockpit)	80.6 (7,48)	1548 (472)	97	1934 (589)	120
Total area + 5%	84.6 (7,86)	1625 (495)	101	2031 (619)	127
Total area + 10%	88.6 (8,23)	1702 (518)	106	2128 (648)	133

Notes & Tips:

3/4" strip width = 1,9 cm
5/8" strip width = 1,58 cm
16 feet = 4,87 m
The accuracy of figures in the table is within (+ -) few feet
For custom calculation, see the Wood strip Calculator
The coverage based on the "+ 10%" is most recommended
Estimate wood for deck inlays as a percentage of the deck surface area
Ideal strip length is between 10 - 16 feet

Fiberglass coverage

Coverage of fiberglass (plain weave e-glass)	yards (yd)	feet (ft)	meters (m)	How to estimate
Deck - 4 oz. e-glass	15		13,7	two times the kayak length + 1 yard (1m)
Hull - 6 oz. e-glass	15		13,7	two times the kayak length + 1 yard (1m)
2" wide glass tape		93	28,3	four times the kayak length + 9 ft (3m)

Notes & Tips:

Minimum width of fabric is 38" - will no allow for full hull abrasion patch
Order 50" width of the 4oz. glass to get the extra hull abrasion patch material
If 50" fabric is not available, order one 'waterline length - LWL' of additional cloth (any weight)
Round figures to the nearest higher number when ordering fabric
The 6oz. glass can always replace the 4oz.
See different types of reinforcement fabrics
Glass tape is sold in 'feet' and cloth in yards (in the US)
Glass tape is used to bond the kayak shells and for additional stem reinforcement

Epoxy

Minimum total volume of epoxy mix (resin + hardener): 3 to 4 gallons

Notes & Tips:

Usage may vary (+-) 0.5 gallon as a result of the thickness of lay-up, fillet size, unused batches, spills, bad (unmixed) batches, care in application (overapplication), additional composite components such as coamings, hatch seals, rudders etc...
If epoxy is sold by weight, the density of epoxy is very close to water (1dm³ = 1 liter = 1kg)
1 gallon = 3.8 liters
Learn about epoxy

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Mail:
Vaclav Stejskal
58 Wood Ln.
Acton, MA 01720
USA
Tel: 781-481-9261

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