Hunter 28.5 Specifications
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* Hull Speed
This form allows calculation of the theoretical maximum speed of a displacement hull. This is an
approximation, and boats may occasionally exceed their theoretical hull speed for brief periods, as
when surfing down large waves, or when temporarily planing in unusual conditions. Also, this limitation
generally does not apply to multi-hulls, though they are technically displacement vessels.
** Displacement to length ratio
This is a useful rule of thumb for determining the relative "heaviness" of a given design. For example, is
the boat heavy for its length? A boat of a given length may fall into one of a number of categories, from
extreme ultra-light racer to armor-plated crab crusher.
Over 380: Very heavy; may be equipped with tank treads.
320 - 380: Heavy.
250 - 320: Medium.
120 - 250: Light.
50 - 120: Ultralight.
Under 50: Extreme ultralight; do not expose to air.
*** Sail area to displacement ratio
The sail area/displacement ratio is a measure of power to weight. Though the speed of a given boat is
determined by a host of other factors in addition to this one, it's still a useful comparison tool. Other
factors being equal, the boat with the higher ratio will be the faster boat overall. Boats with sail
area/displacement ratios below 16 will generally be fairly slow. Boats with ratios over 22 will be very
fast, and some extreme multihulls will have ratios over 30.
**** Capsize screen
The Capsize Screening Formula was developed by the U.S. Sailing Association as a rough rule of
thumb, helpful in comparing the initial resistance to capsize of various boats. Boats with a Capsize
Screen factor of 2 or less will have a normal initial resistance to capsize and will in general be safer
offshore boats than boats which exceed this value. The lower the value, the better, all other things
being equal.
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Displacement to
length
ratio **
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Sail area to
displacement
ratio ***
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QTY
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DESCRIPTION
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SIZE
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OTHER INFO AND SHACKLE
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LENGTH IN
FEET
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1
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MAIN HALYARD
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3/8" X.L.S
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EYE W/3900 SHACKLE B.E.
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90
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1
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JIB HALYARD
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7/16" X.L.S
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EYE W/721-2
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98
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1
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MAIN SHEET
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3/8" X.L.S
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B.B.E
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68
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2
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JIB SHEETS
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7/16" X.L.S
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B.B.E
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40
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1
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VANG
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7/16" X.L.S
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B.B.E
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35
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1
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TRAVELER CONTROL LINE
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3/8" X.L.S
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B.B.E
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20
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1
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OUTHAUL
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5/32" 7X19 S.S
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THIM.--OPEN
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10
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3/16" X.L.S
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B.B.E
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28
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1
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CUNNINGHAM
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1/4" X.L.S
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EYE W/721-1 B.E
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28
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1
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TOPPING LIFT
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5/16" X.L.S
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B.B.E
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70
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2
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REEF LINES
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5/16" X.L.S
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B.B.E
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16
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1
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JIFFY REEF
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1/4" X.L.S
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B.B.E
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50
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QTY
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DESCRIPTION
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WIRE SIZE &
TYPE
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FITTING TO FITTING
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O/A DIM
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1
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HEADSTAY
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1/4" - 1X19
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M.EYE / 8-16-16
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39' 2"
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1
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UPPER BACKSTAY
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1/4" - 1X19
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M.EYE / JAW
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30'
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2
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LOWER BACKSTAY
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3/16" - 1X19
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JAW / 6-12-12
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9' 10 1/4"
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2
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UPPER UPPERS
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3/16" - 1X19
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M.EYE / A+N EYE
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10' 8 5/8"
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2
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LOWER UPPERS
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3/16" - 1X19
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A+N EYE / 6-12-12
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25' 6"
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2
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UPPER INTERMEDIATES
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3/16" - 1X19
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M.EYE / A+N EYE
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11' 6"
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2
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LOWER INTERMEDIATES
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3/16" - 1X19
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A+N EYE / 6-12-12
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13' 8 3/4"
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2
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UPPER DIAMONDS
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5/32" - 1X19
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M.EYE / 5-10-10
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11' 8 3/4"
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2
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LOWER DIAMONDS
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5/32" - 1X19
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M.EYE / 5-10-10
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12' 2 1/4"
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2
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LOWERS
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1/4" - 1X19
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M.EYE / 8-12-12
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13' 4 1/4"
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SLITTER PLATE
3/8"X5/16"X5/16"
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