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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
Metric / Standard 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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Last page update: 27 June 2014