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Expedition Sport
Technical specs...

  High performance touring kayak for medium weight paddlers







        

See how John Wentz (Fire Captain from Puget Sound, Washington) built his Sport
Also check out John Caldeira's Sport construction page


Expedition Sport description | MATERIALS
Larger displacement version of this kayak: Expedition

Property English Units Metric Units Comments
Length Overall 16.75 ft 5,105 m length from bow to stern as designed
Beam Overall 21.5 in 54,61 cm widest part of kayak
Draft 3.77 in 9,57 cm baseline to Designed Water Line (DWL)
Volumetric Properties
Displacement 205 lb 93,1 kg at DWL
Volume 3.203 ft^3 90,67 liters displacement in cubic feet and liters of sea water
Wetted Surface 18.52 ft^2 1,72 m^2 underwater surface area to DWL
LCB 8.09 ft 2,465 m longitudinal center of buoyancy from x=0
LCB % LWL 53.4 % 53,4 % LCB as a percetage of waterline length from x=0
VCB 2.34 in 5.95 cm vertical center of buoyancy from baseline
Waterplane Properties
Waterplane area 15.67 ft^2 1,455 m^2 at DWL
LCF 7.97 ft 2,43 m longitudinal center of flotation from x=0
LCF % LWL 52.7 % 52,7 % LCF as a percetage of waterline length from x=0
LWL 15.129 ft 4,611 m length of waterline; same as DWL
BWL 19.84 in 50,39 cm beam of waterline
Sinkage 83.57 lb/in 14,95 kg/cm pounds displaced per one inch of sinkage
Form Coefficients (no units, same for metric)
Cb 0.407       block
Cm 0.794       midship
Cp 0.513       prismatic
Cwp 0.626       waterplane
Area/Displacement 8.52       Area / Displacement ratio [ft^2/(ft^3)^2/3]
Length / Beam 9.15       Length / Beam ratio [LWL / BWL]
Miscellaneous
Area of cockpit 2.96 ft^2 0,275 m^2 for cockpit template in plans (red)
Circumference 6.76 ft 2,06 m cockpit
Depth in front 12 5/8 in 32,06 cm inside cockpit
Depth in rear 10 in 25,4 cm inside cockpit
Deck area 22.85 ft^2 2,123 m^2 includes cockpit area
Hull area 30.01 ft^2 2,788 m^2  
Kayaker Fit & Loading Medium size paddlers
140 lb min. -> 160 lb ideal -> 200lb max. (63,7 -> 72,8 -> 90.9kg)
Recommended max. load: 244lb (111 kg)
Paddler height: 6 feet and under (182 cm)
x=0 the start of waterline (DWL) at bow

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

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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) 52.86  (4,9) 1015  (309) 63 1269  (386) 79
Total area + 5% 55.5  (5,15) 1066  (324) 66 1332  (406) 83
Total area + 10% 58.14  (5,4) 1116  (340) 70 1396  (425) 87

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 12.2   11,2 two times the kayak length + 1 yard (1m)
Hull - 6 oz. e-glass 12.2   11,2 two times the kayak length + 1 yard (1m)
2" wide glass tape   76 23,2 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): 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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Last page update: 11 January 2020