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Coho
by Pygmy Boats, Inc. Specifications
|
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| Length
overall |
17'
6 1/4" |
| Beam |
23
3/8" |
| Volume |
12.79
cu. ft. |
| Cockpit
size |
17
3/8" x 33 1/8" |
| Cockpit
coaming height |
Forward
12 1/8"
Aft 9 7/8" |
| Height
of seat |
7/8" |
| Weight |
38
1/2 lbs. |
Center
of buoyancy*
*With 250-lb. load |
51% |
|
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 |
0.92 |
| 3
knots |
1.94 |
| 4
knots |
3.52 |
| 4.5
knots |
5.09 |
| 5
knots |
7.94 |
| 6
knots |
13.98 |
Calculated
by Matt Broze
using Taylor Standard Series: |
| 2
knots |
0.92 |
| 3
knots |
1.92 |
| 4
knots |
3.70 |
| 4.5
knots |
4.86 |
| 5
knots |
7.50 |
| 6
knots |
14.34 |
|
| Hydrostatics |
| Paddler
weight |
150 lbs. |
200 lbs. |
150 lbs. |
200 lbs. |
| Cargo weight* |
none |
none |
100 lbs. |
100 lbs. |
| Waterline
length |
15' 9.6" |
15' 11.7" |
16' 1" |
16' 1.8" |
| Waterline
beam |
22.2" |
22.4" |
22.6" |
22.9" |
| Draft |
3.5" |
4.1" |
4.6" |
5.2" |
| Prismatic
coefficient |
0.45 |
0.47 |
0.48 |
0.49 |
| Block coefficient |
0.34 |
0.37 |
0.39 |
0.40 |
| Wetted
surface (sq. ft.) |
18.55 |
20.36 |
21.98 |
23.48 |
| Lbs./inch
immersion |
87.6 |
92.7 |
96.5 |
99.4 |
* 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 |
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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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