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--- drawingboard:components:propulsion:water [2024/07/08 13:18] – [Sails (TR -4)] tailkinker
+++ drawingboard:components:propulsion:water [2024/07/08 13:38] (current) – [Sail Performance] tailkinker
@@ Line 29: / Line 29: @@
 To find the maximum area of sail any one mast can support, find its total length on the Linear column of the [[drawingboard:fundamentals:scale#Volume Table]], then read back to the Area column.  Choose any size of sail up to this limit.  But note that your masts will have some mass;  if you want less sail area than your masts support, you should probably reduce the size of your masts!
+Masts and sails don't take up any volume inside the vehicle.  To find the mass of your mast, find its volume on the [[drawingboard:fundamentals:scale#Volume Table]], and divide by eight to find its mass in tonnes, or multiply by 125 to find its mass in kilograms.
+Sails will weigh 5kg per square meter, and will cost 10\[ce] per square meter.  If your vessel is TR 0 or better, you can use synthetic sailcloth, with will weigh 3kg per square meter, but will cost 100\[ce] per square meter.
+==== Sail Performance ====
+Multiple masts will allow you to hang more sail on your vessel, but you will suffer a loss of efficiency due to turbulence within the sail system.  To find your total thrust from your sails:
+  - Add one to your total number of masts, then divide by two;
+  - Multiply this value by your sail area;
+  - Multiply the product by 25.  This is your sails' thrust in Newtons.
+This assumes a fresh breeze (about 10 meters per second wind speed), which is about the strongest wind that you really want to sail in.  If the wind is stronger than this, the excess thrust generated by the wind will be eaten up crashing through taller waves.  However, if the wind is less than a fresh breeze, your speed will drop.