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1981 Kirby 25

Listed
Expired
$9,500 USD

Seller's Description

Kirby 25, 1981 Located in Louisville, KY hull #202

Hull Type: Fin w/spade rudder Rigging Type:Fractional Sloop LOA: 25.17 ft / 7.67 m LWL:20.75 ft / 6.32 m Beam:8.75 ft / 2.67 m Draft (max):4.17 ft / 1.27 m Displacement:3,150 lb / 1,429 kg Ballast:1,150 lb / 522 kg

Other Details:

Almost new North Sails with roll bags North Radian Main North 3DL black Aramid #1 155% Genoa North Radian #3 Blade North AIRX600 Spinnaker Horizon .75oz Spinnaker (older but in good shape) Recent complete hardware refit and new hi-tech lines. V-100 Vectran halyards WarpSpeed tapered spinnaker sheets MLX main and jib sheets Dyneema backstays

Almost New Harken blocks and cleats Almost New Harken traveler Almost New Electronics New BoomKicker boom support New WaveFront tiller clutch

B&G Vulcan 5 GPS/chartplotter & instrument repeater B&G DST800 Speed and Depth NMEA-2000 transducer New electric distribution panel Almost New Seaboard hatch boards Almost New Bomar front hatch & new lexan windows Custom bow pulpit & stern rails Good bottom with epoxy barrier coat VC-17 Good trailer with updated pads,paint newer tires & rims Interior is clean with good cushions 2020 Tohatsu 6 HP MFS6CDL Outboard Motor

Dual axle trailer with adjustable height hitch, anti-sway bar updated pads,paint newer tires & rims.

or phone (502) 751 80-two-nine

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Specs

Designer
Bruce Kirby
Builder
Mirage Yachts Ltd
Association
Kirby 25
# Built
223
Hull
Monohull
Keel
Fin
Rudder
Spade
Construction
FG

Dimensions

Length Overall
25′ 1″ / 7.7 m
Waterline Length
20′ 8″ / 6.3 m
Beam
8′ 9″ / 2.7 m
Draft
4′ 2″ / 1.3 m
Displacement
3,150 lb / 1,429 kg
Ballast
1,150 lb / 522 kg

Rig and Sails

Type
Sloop
Reported Sail Area
289′² / 26.9 m²
Total Sail Area
289′² / 26.9 m²
Mainsail
Sail Area
170′² / 15.8 m²
P
30′ 2″ / 9.2 m
E
11′ 3″ / 3.4 m
Air Draft
?
Foresail
Sail Area
119′² / 11.1 m²
I
26′ 6″ / 8.1 m
J
8′ 11″ / 2.7 m
Forestay Length
27′ 11″ / 8.5 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
7.8 kn
Classic: 6.1 kn

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

7.79 knots
Classic formula: 6.1 knots
Sail Area/Displacement
21.5
>20: high performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
21.52
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
36.5
<40: less stiff, less powerful

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Formula

Ballast / Displacement * 100

36.53
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
157.8
100-200: light

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
157.77
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
12.2
<20: lightweight racing boat

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
12.17
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
2.4
>2.0: better suited for coastal cruising

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
2.39
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Thanks to Chuck Lanning for providing additional information and corrections.

This listing is presented by SailingTexas.com. Visit their website for more information or to contact the seller.

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