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The Endeavor by Seaward Kayaks, Specifications

Length overall 17' 5 1/2"
Beam 23 3/8"
Volume 12.64 cu. ft.
Cockpit size 14 7/8" x 27 5/8"
Cockpit coaming height Forward 12 3/8"
Aft 10"
Height of seat 5/8"
Weight 57 1/2 lbs.
Center of buoyancy*
*With 250-lb. load		 49%
Speed vs. Resistance
These figures are derived from mathematical models based on a limited number of towing tests on flat water.

Kayak weight + 250-lb payload. Resistance in pounds, shown to hundredths to differentiate figures formerly rounded to tenths. Factor added for plastic hulls

Calculated by the KAPER program
by John Winters:
2 knots 0.91
3 knots 1.91
4 knots 3.56
4.5 knots 5.18
5 knots 7.92
6 knots 13.82
Calculated by Matt Broze
using Taylor Standard Series:
2 knots 0.89
3 knots 1.89
4 knots 3.52
4.5 knots 4.80
5 knots 7.32
6 knots 13.45

Hydrostatics

Paddler weight 150 lbs. 200 lbs. 150 lbs. 200 lbs.
Cargo weight* none none 100 lbs. 100 lbs.
Waterline length 14' 8.9" 15' 1.2" 15' 4.4" 15' 7.3"
Waterline beam 20.3" 20.8" 21.2" 21.6"
Draft 4.2" 4.9" 5.4" 6.0"
Prismatic coefficient 0.52 0.52 0.52 0.52
Block coefficient 0.37 0.38 0.39 0.40
Wetted surface (sq. ft.) 17.57 19.33 20.99 22.58
Lbs./inch immersion 78.7 83.1 86.8 90.2

* Fixed "paddler" weight has its center of gravity located 10" above the lowest part of the seat and 10" forward of the seat at back. The "cargo's" center of gravity coincides with the kayak's approximated center of gravity.
Calculated by Nautilus System(tm) computer program
Righting/Healing Moments
(fixed-weight)

Stability Curves

1. 150 lb. paddler, no cargo
2. 200 lb. paddler, no cargo
3. 150 lb. paddler, 100 lb. cargo
4. 200 lb. paddler, 100 lb. cargo

The same forces that right a kayak on flat water contributes to its rolling motion on the face of a wave.

Reading the Stability Curves

The steeper the slope of the curve as it rises from 0°, the higher the initial stability. Beyond the maximum righting moment at the peak of the curve, the kayak enters an unstable region of decreasing stability which does little to slow the rolling of the kayak to the point of imminent capsize. Raising the center of gravity decreases the stability; lowering it increases stability.



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