Size chart & measuring guide
Choose your F4050C code by comparing the dimensions below with your sail and boom setup. The codes identify sizes; they are not boat model numbers.
A = mast-side height; B = overall cover length; C = upper opening circumference; D = aft opening circumference. Refer to the A–D diagram below for measurement positions. For C and D, the original chart specifies measuring flat and doubling.
| Code | A (cm) | B length (cm) | C circumference (cm) | D circumference (cm) |
|---|---|---|---|---|
| F4050C-1 | 94–96 | 243–245 | 59–61 | 55–57 |
| F4050C-2 | 94–96 | 273–275 | 59–61 | 55–57 |
| F4050C-3 | 94–96 | 304–306 | 59–61 | 55–57 |
| F4050C-4 | 94–96 | 334–336 | 59–61 | 55–57 |
| F4050C-5 | 103–105 | 365–367 | 67–69 | 60–62 |
| F4050C-6 | 111–113 | 395–397 | 73–75 | 65–67 |
| F4050C-7 | 120–122 | 426–428 | 82–84 | 70–72 |
| F4050C-8 | 125–127 | 456–458 | 89–91 | 75–77 |
| F4050C-9 | 137–139 | 487–489 | 97–99 | 82–84 |
| F4050C-10 | 145–147 | 517–519 | 104–106 | 86–89 |
Measurements are in centimeters (1 inch = 2.54 cm). These are cover dimensions from the illustrated chart, not a boat-size recommendation.
Before ordering
- Measure with the mainsail stowed in the position in which it will be covered.
- Compare the required length and end measurements with the diagram and table.
- Select the matching code and color. If your measurements fall between sizes or fittings alter the shape, contact us before choosing.
Need help choosing? Email bg4epx@gmail.com with your measurements and photos before ordering.
