Cape Ann Expedition
Technical specs...

  Fast, seaworthy and well tracking cruiser. Also available with high deck for tall paddlers (Plans for high deck available by request).


Expedition standard deck (left) and Expedition High Deck (right)

Cape Ann Expedition Preview

Cape Ann Expediton description | MATERIALS
CAD view
Smaller displacement version of this kayak: Expedition SPORT

Finally got a chance to paddle the other day.....she moves as well as she looks. What a pleasure! - Bruce Crosby

Check out the Expedition 'Dolphin' that Jurgen Koppen has built to order and what it looks like in Eskimo rolling action

Length Overall 18.5 ft 5,63mlength from bow to stern as designed
Beam Overall 22 in 55,8cmwidest part of kayak (high deck is 0.2" wider)
Draft 4 1/8 in 10,48cmbaseline to Designed Water Line (DWL)
Volumetric Properties
Displacement 260 lb 118,2kgat DWL
Volume 4.06 ft^3 115litersdisplacement in cubic feet or liters of sea water
Wetted Surface 21.62 ft^2 2,008m^2underwater surface area to DWL
LCB 9.01 ft 2,746mlongitudinal center of buoyancy from x=0
LCB % LWL 53.4% 53,4%LCB as a percetage of waterline length from x=0
VCB2.55 in 6,48cmvertical center of buoyancy from baseline
Waterplane Properties
Waterplane area 17.88 ft^2 1,661m^2at DWL
LCF 8.87 ft 2,705mlongitudinal center of flotation from x=0
LCF % LWL52.6%52,6%LCF as a percetage of waterline length from x=0
LWL 16.86 ft 5,14mlength of waterline; same as DWL
BWL 20.6 in 51,3cmbeam of waterline
Sinkage 95.4 lb/in 17,06kg/cmpounds displaced per one inch of sinkage
Form Coefficients (no units, same for metric)
Cb0.417    block
Cp 0.52    prismatic
Cwp 0.632    waterplane
Area/Displacement8.49   Area / Displacement ratio [ft^2/(ft^3)^2/3]
Length / Beam10.05   Length / Beam ratio [LWL / BWL]
Area of cockpit 2.97 ft^2 0,275m^2for cockpit template in plans (small)
Circumference 6.76 ft 2,06mcockpit
Depth in front 12 3/4 in 32,3cminside cockpit
Depth front (high)13.8in 35,1cmExpedition with high deck
Depth in rear 10 1/4 in 26cminside cockpit
Depth rear (high)10.65in 27,05cmExpedition with high deck
Deck area 25.2 ft^2 2,34m^2 includes cockpit area
Deck area (high) 25.5ft^2 2,369m^2Expedition with high deck
Hull area 33.1 ft^2 3,07m^2 
Kayaker fit & LoadingMedium to large paddlers
170 lb min. -> 210 lb ideal -> 260lb max. (77 -> 95.5 -> 118kg)
Recommended max. load: 310lb (169 kg)
Paddler height: 6'3" feet and under (191cm)

Expedition High Deck - large cockpit knee and foot space for tall or long legged paddlers. High deck plans are shipped by request only.
Paddler height: 6'2" to 6'7" (188 - 200cm)
x=0 the start of waterline (DWL) at bow



  Wood strips - assumes bead & cove strips
Unit converter
Metric / Standard unit converter

Coverage + 'fudge factor' for wasteSurface area (ft2) (m2)Total length of 3/4" strips (ft) (m)Number of 3/4"x 16ft stripsTotal length of 5/8" strips (ft) (m)Number of 5/8"x 16ft strips
Total area of kayak (+ cockpit)58.38  (5,42)1121  (342)701401  (427)88
Total area + 5%61.2  (5,69)1177  (359)741471  (448)92
Total area + 10%64.2  (5,96)1233  (376)771541  (469)96

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)
How to estimate
Deck - 4 oz. e-glass13.3 12,2two times the kayak length + 1 yard (1m)
Hull - 6 oz. e-glass 13.3 12,2two times the kayak length + 1 yard (1m)
2" wide glass tape 8325,3four 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
 Minimum total volume of epoxy mix (resin + hardener): 2.5 to 3 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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Tel:  781-481-9261


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Last page update: 9 May 2024