A Ship's tightest possible turning circle has a radius (in normal circumstances) of half its length. however of coarse that's not the main problem the problem is the formulae which of coarse is 0.5(2π x o.25L). L= length there are of coarse several modifiers that affect the distance.
- damaged rudder x1.8
- damaged hull x1.6
- damaged rigging/sails x1.7 (unless ore/steam powered)
- streamline hull x0.7
- bulky x1.2
- over loaded x1.2
- travelling at high speed x1.5
- travelling at reasonable speed x1.2
- travelling at a slow speed x0.9
- deep draft x1.5
- shallow draft x0.8
- contrary currents x1.9
- contrary wind direction x1.8
- Wind aids turn x0.7
- current aids turn x0.8
- Ship is using ores x0.5
But the distance covered by a ship during a turn also depends of the weather, the amount of sails and their size the ship has, and also the speed of the ship the previous turn.
Now you may be wondering what I mean by reasonable speed, high speed and slow speed... High speed is the speed a ship travels when its at full sail and the winds are favouring it. Reasonable speed is when its using more than 1/2 its possible sail power and the winds are in its favour or the ship is using full sail but the winds are not giving it full power. Normal speed is when its either using around 1/2 its sail power and the winds are favourable or when its using a greater amount of sail but the winds are not favouring it. slow speed is when the ship is either using below 1/2 its sail power or the winds are contrary. The actual speeds them selves are determined by eye, how many sails and how big they are and the shape of the ship... if its wide then its slower and if its got lots of sails and their huge its very fast :-) nice and simple.
As for ore power, well I think that the number of ores must determine its speed. what that speed is I have no idea.
But there is still so much to figure out! and of coarse there is the factor of gun on the ship. BUT all crew and guns will be affected by complementary land rules... the other ones I am making.