Sail Cloth Select

Sail Cloth Select

SAIL CLOTH SELECTOR

CRUISING/CLUB RACE

Length Overall (feet) 20-24 25-28 29-32 33-36 37-42 43-48 49-55
Mainsail
Drifter/Reacher
6.0
1.5N
6.4
1.5 N
6.8
1.5 N
7.25 M
3.0
8.25 M
3.0
9.25
3.7
10.5
3.7
#1 Genoa 180%
#2 Genoa 150%
#3 Genoa 120%
4.2
5.2
5.5
4.5
5.5
5.75
5.2
5.75
6.4
5.5
6.4
6.8 M
6.4
6.8G
7.25 M
6.8 G
7.25 G
8.25 M
7.25 G
8.25 G
9.25
Storm/Trysail
Heavy spinnaker
Cruising spinnaker
Light spinnaker
5.75
1.5
.75
.75
6.4
1.5
.75
.75
6.8G
1.5
.75
.75
7.25 G
2.25
1.5
.75
8.25 G
2.25
1.5
.75
9.25
2.25
2.25
.75
10.5
2.25
2.25
.75

RACING SELECTOR

Length Overall (feet) 20-24 25-28 29-32 33-36 37-42 43-48 49-55
Mainsail
HMC
Mylar
5.25
5.5
2.5PL
6.0
6.0
3.5
6.8 M
6.5
5.0
7.25 M
7.25
3.5 PL
8.25 M
——
5.0 PL
9.25
2×5.25
——-
10.5
2×6.0
——-
#1 Light Genoa 180%
HMC
Mylar
3.0
—–
2.5*
3.7
—–
2.5*
4.0
4.5
2.5
4.0
4.5
2.5
4.5
4.5
2.5
4.5
4.5
3.5
5.2
4.5
3.5
#1 Heavy Genoa 180%
HMC
Mylar
4.2
4.5
2.5
4.5
4.5
2.5
5.2
5.5
5.5
5.5
5.5
3.5
6.4
6.0
3.5 PL
6.8 G
6.5
5.0
7.25 G
7.25
2×3.5
#2 Genoa 150%
HMC
Mylar
5.2
5.5
3.5
5.5
5.5
5.0
5.75
6.0
5.0
6.4
6.5
2 x 3.5
6.8 G
7.25
2×3.5
7.25G
4.5 PL
2×5.0
8.25 G
2×4.5
2×5.0
#3 Genoa 120%
HMC
Mylar
5.75
5.5
2×2.5
6.4
6.0
3.5PL
6.8 M
6.5
5.0 PL
7.25 M
7.25
5.0 PL
8.25 M
2×4.5
2×5.0
9.25
2×5.5
——
10.5
2×6.0
—–
#4 Storm Sails
Windseeker
6.0
.75N
6.4
1.5 N
6.8 G
2.5*
7.25 G
2.5*
8.25 G
2.5*
9.25
2.5*
10.5
2.5*
Light Spinnaker
Heavy Spinnaker
.75
.75
.75
15
.75
15
.75
15
.75
15
.75
2.25
15
2.25
Reaching Spinnaker
Blooper
1.5
.75
1.5
.75
2.5*
.75
2.5*
.75
2.5*
1.5
2.5*
2.25
2.5*
2.25

Abbreviations

(M = Mainsail) (N = Nylon cloth) ( G = Genoa cloth) ( PL = Two-ply leach)   ( * = Nylon-Mylar-Nylon {All other Mylar single-sided}) (All Cloth Dacron unless noted)

Sail Cloth Approximation Formula

Velocity Wind{Ft/Sec} = 1.666 x Knots Wind {Apparent}
Force = .00122 x (Velocity Wind) ^ 2 x Area Sail x Lift Coefficient (Usually 1.00)
Oz-Cloth{Min}=Sq. Root(Force)/ 3
Note: All cloth weights are in ounces/yard for  28.5 IN width cloth.  
Example: For a 300 SF sail @ 15 Knots Apparent wind
24.99 = 1.666 x 15
228.56 = .00122 x (24.99) ^ 2 x 300 x 1
5.039 = Sq. Root (228.56) / 3
Cloth Weight is 5 oz / yard
Width of American Cloth is 28.5 and British Cloth is 36.0
To Convert American To British Cloth Weight

American Ounces X 1.2 = British Ounces

To convert British to American
British Ounces  X .8 = American Ounces

(Abbreviations)  (Builders) (Engineering reference)  (Sailcloth selector)  (Typical Drawings)
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Last modified: May 10, 1999