# Hurley 18

1963 — 1972
Designer
Ian Anderson
Builder
Hurley Marine Ltd.
Association
Hurley Owners Association
# Built
377
Hull
Monohull
Keel
Fin
Rudder
Spade
Construction
FG

### Dimensions

Length Overall
18 6 / 5.6 m
Waterline Length
14 6 / 4.4 m
Beam
6 7 / 2 m
Draft
3 2 / 1 m
Displacement
2,350 lb / 1,066 kg
Ballast
1,000 lb / 454 kg (Iron)
• 1 / 1

### Rig and Sails

Type
Sloop
Reported Sail Area
180′² / 16.7 m²
Total Sail Area
76′² / 7.1 m²
Sail Area
42′² / 3.9 m²
P
14 6 / 4.4 m
E
5 8 / 1.8 m
Air Draft
?
Sail Area
34′² / 3.2 m²
I
15 6 / 4.7 m
J
4 4 / 1.3 m
Forestay Length
16 1 / 4.9 m

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

### Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Hull Speed
5.1 kn
Classic: 5.1 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

5.11 knots
Classic formula: 5.1 knots
Sail Area/Displacement
16.3
16-20: good 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.
16.29
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
42.6
>40: stiffer, more 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

42.59
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
344.1
275-350: heavy

### 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
344.05
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
18.4
<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
18.39
<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
2.0
>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
2.0
<2: better suited for ocean passages
>2: better suited for coastal cruising

### Notes

Before Hurley Marine went out of business the moulds were sold to Russell Curnow of Penzance, Cornwall who continued to build them up until about 1979. The moulds were then bought by Varne Yachts of Nottingham who were later taken over by Weston Boats who then went out of business in 1986. Over 900 H18s were built altogether.

Thanks to Nick Vass and the Hurley Owner Assoc. (site listed above) for images and information about all Hurley models.

### For Sale

Have a sailboat to sell?
List it for free and it will show up here.
Advertisement

Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

We will occasionally send you relevant updates. You can opt out or contact us any time.

### Subscribe

Get occassional updates about new features or featured sailboats.
You can opt out or contact us any time.
Measurements:

Made with ♥ by the founders of Refit Guide
©2022 Sea Time Tech, LLC

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.