Expedition Sport Kayak- particulars

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 !

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)	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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Mail:
Vaclav Stejskal
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Tel: 781-481-9261

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