What is a good sail area to displacement ratio?
In general terms, a boat having a sail area-displacement ratio under 15 would be considered under-canvased; values above 15 would indicate reasonably good performance; and anything above 18 to 20 suggests relatively high performance, provided the boat has sufficient stability and a low enough displacement-length ratio …
What is a good comfort ratio for a sailboat?
You can use the following guidelines to interpret comfort ratio results: numbers below 20 indicate a lightweight racing boat; 20 to 30 indicates a coastal cruiser; 30 to 40 indicates a moderate bluewater cruising boat; 50 to 60 indicates a heavy bluewater boat; and over 60 indicates an extremely heavy bluewater boat.
What is displacement sailing?
In simple terms: “Yacht Displacement is the weight of the water that is moved when the yacht is out at sea” The weight of the water that is displaced is equal to the weight of the yacht and its load (fuel, water, provisions, etc). It is an indicator of how heavy a boat is. Displacement also includes ballast.
How is upwind sail area calculated?
Calculating Sail Area To find the area of the triangle in square feet, just multiply the two together and divide by 2 (100% foretriangle = (I x J) ÷ 2).
What is a good ballast displacement ratio?
Ballast to displacement ratio formula The average value is between 0.35 and 0.45 for cruising boats. This means that on average, 35-45% of the weight of a cruising boat will be carried in the keel ballast. It is a simple indicator that can give you a rough idea of how stiff and stable the boat will be.
Does sailboat displacement include ballast?
Does sailboat displacement include ballast? Displacement is always measured including ballast, since adding ballast increases the total displacement.
Is displacement a ratio?
The displacement–length ratio (DLR or D/L ratio) is a calculation used to express how heavy a boat is relative to its waterline length. DLR can be used to compare the relative mass of various boats no matter what their length.
How do you calculate hull displacement?
To find a boat’s D / L ratio, you first calculate its displacement in long tons (DLT), with 1 long ton equalling 2,240 pounds. Then take the boat’s load waterline length (LWL), multiply it by 0.01, and cube the result. Finally, take this result and divide it into DLT. As per this formula; D / L = DLT ÷ (0.01 x LWL) ³.
How do you calculate boat displacement?
The volume below the float plane times the weight of water (fresh is 62.4 and salt is 64.) equals the displacement of the boat. The displacement of the boat minus the boat weight divided by five is the maximum safe load.
What is ballast ratio on a sailboat?
The ballast ratio is the percentage of the boat’s weight that is ballast. For example, a boat that displaces 13,608kg (30,000 lb) with a 4,536kg (10,000lb) ballast keel has 33% ballast ratio.
What is sailboat comfort ratio?
The Comfort Ratio is as a measure of motion comfort. It is based on the fact that the faster the motion the more upsetting it is to the average person. Given a wave of X height, the speed of the upward motion depends on the displacement of the yacht and the amount of waterline area that is acted upon.
What is a good ballast to displacement ratio?
What sail dimensions are required to calculate sail areas?
The required sail dimensions for calculating the area of any triangular sails are usually its height and the length of its foot. But that only works for mainsails and mizzens with no roach, and jibs with a 90 degree angle at the clew – and what about high-cut headsails, spinakers and cruising chutes?
What is a displacement ratio?
The Displacement-Length-Ratio in general is a non-dimensional number. It sets into relation the displacement of a boat (expressed in pounds) to the length of her waterline (in feet).
What is sail displacement?
Displacement is the amount of the water in pounds that is displaced by the weight of the boat. A full dispalcement boat displaces 100% of its weight in water. Sailboats typically are full displacement.
