How to choose the right sail
There is no ideal sail. There is only a sail that most suits your personal budget, plans and preferences. When buying a yacht, you need to take into account a lot of things and nuances. Starting from the technical characteristics of the boat, ending with the level of your physical condition. Well, the new models are designed to simplify all the necessary work on board. One of the most important components of the yacht’s components is a sail.
A sail is an important subject
Given personal wishes and taste preferences, do not forget about the reasonable choice and analysis of the yacht’s performance in the future. Even with a large budget, the purchase should be based on economic and technical characteristics. From the sail will depend basic parameters such as movement and stability.
How to identify a suitable sail
There are several formulas for calculating forces and efficient operation, based on sail sizes relative to the yacht. Thus, it is possible to calculate with some mathematical accuracy some important variables and get an idea of the ideal sail for a boat. The most important factor in most calculations is not the length, but the offset. These formulas give a clear idea of the real characteristics of a yacht:
- The ratio of the length of the sail to the beam indicates the internal space and the nominal stability on the water. The result from 2.8 to 3.2 is common to small boats, and the value is from 3.6 to 4.0 for yachts bigger than 40 feet.
- The “speed-length” relationship is used for traditional estimates the speed of a boat. This is a constant multiplied by the square root of the length of the waterline. The most commonly used constant is 1.34. That means, a 36 foot yacht will have an estimated max speed of 8.04 knots (the square root of 36 = 6 multiplied by 1.34 = 8.04). Modern yachts can exceed the ratio of 1.4. For yachts intended for long-term sea voyages, the value of the constant is close to unity. It is useful to know that the power needed to increase a speed will be greater than the applied power for the permissible speed of the yacht.
- Offset in length is a dimensionless ratio that allows you to compare the movement of yachts. The offset is indicated in one foot per ton, and this is divided by 0.01 in the cube. Values from 280 to 320 are typical for cruisers. Boats with a lower ratio will have an acceleration higher, that is incompatible with sailing in the sea, and have a small carrying capacity. This formula is suitable for calculating large yachts.
- The ratio of sail area to offset is the most important, but also difficult to calculate without a scientific calculator. The sail area of a yacht in square feet is multiplied by 100 percent and is divided by the offset indicated in cubic feet of sea water (the shift in pounds divided by 64). Everything is multiplied by the power. The received value can be considered as horsepower per pound of a motor boat. Higher scores indicate better potential performance. Most cruisers have a ratio between 14 and 18.