Passat by Seaward Kayaks Specifications

Length overall 21' 11 3/4"
Beam 26 5/8"
Volume 27.65 cu. ft.
Cockpit size 16 3/8" x 32"
Cockpit coaming height Forward 13 7/8" Bow, 13 1/2" Stern
Aft 11 1/8" Bow, 10 7/8" Stern
Height of seat 11/16"
Weight 91 1/4 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. A fit paddler can maintain a cruising speed at 3 pounds of drag. Only a few can work against 5 pounds of drag for long distances. See August '98 page 43 for more details.

Calculated by the KAPER program
by John Winters:
(Factor added for soft plastic hulls when applicable):
2 knots 1.37
3 knots 2.88
4 knots 4.90
4.5 knots 6.68
5 knots 8.46
6 knots 14.44
Calculated by Matt Broze
using Taylor Standard Series:
2 knots 1.52
3 knots 2.92
4 knots 5.37
4.5 knots 6.92
5 knots 8.94
6 knots 14.54
Hydrostatics
Paddler weight 2 @ 150 lbs. 2 @ 200 lbs. 2 @ 150 lbs. 2 @ 200 lbs.
Cargo weight* none none 100 lbs. 100 lbs.
Waterline length 19' 8.4" 19' 11.5" 19' 11.5" 20' 1.7"
Waterline beam 26.0" 26.8" 26.8" 27.2"
Draft 4.1" 4.7" 4.7" 5.4"
Prismatic coefficient 0.59 0.60 0.60 0.49
Block coefficient 0.42 0.44 0.44 0.45
Wetted surface (sq. ft.) 31.43 34.01 34.01 36.37
Lbs./inch immersion 150.7 158.1 158.1 163.9
* 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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