Ship Dimension, Ship drag in water, and Wind Direction Mechanics
Credit to Pr0SkyNesis on Discord. A great modder that contribute to the comminity alot.
Crosspost to here for easier access to these info for future reference.
Self explantory. Size and mass of each ship.
Hull Water drag compare to speed. Cutter/Clipper/Happy Bay Boat are modded boat
From the result, theoretical top speed for small boat is around 12 knots if your hull stays in water.
Speed is affect by shipmass, water drag and sail area of boat.
Water drag act as flat deceleration when you reach certain speed.
So from pure water drag aspect. Speed: Cog > Dhow > Kakam.
But since Cog is much heavier (check above form), and Dhow have access to tall mast and easier time to balance sail (Cog have serious weather helm problem if your mizzen sail is big), in reality Dhow will likely be fastest ship. And it's also nimble too.
For medium ship. Theoretical top speed will be around 16 knots. It will be Brig > Junk > Sanbuq.
This time Brig can remain the king since you could stuff most sail area into brig among medium ship since it's size is more like medium-large.
Junk is lightest and have good drag, but suffer from heeling problem more than other 2. Adding deep keel and remove house cabin will help mitigate the problem. It's also very nimble for it's size.
Sanbuq actually get the short end of stick here. But at medium ship range you should always have enough sail area to push to reasonable speed without worrying about heeling. I feel its less important than small ship, which really need to consider about heeling.
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Wind direction mechancis, following the the 1000 simulation test perform by Pr0SkyNesis.
Blue means it's match with trade wind direction.
Al'Ankh Wind Direction and Chance
Emerald Archipelagos Wind Direction and Chance
Aestrin Wind Direction and Chance
From Discord quoting Pr0SkyNesis
Good winds are winds less than 30° from the ideal trade wind for that region.
Good winds in Aestrin: 59.39 %
Good winds in Al'Ankh: 71.23 %
Good winds in Emerald: 64.78 %
and quoting from NANDbrew, another great modder. The wind direction mechanic is define like following
Al'ankh
Wind Chaos: 3
Wind Dir Chaos: 0.14
Aestrin
Wind Chaos: 8
Wind Dir Chaos: 0.21
Emerald
Wind Chaos: 5
Wind Dir Chaos: 0.18
Fire Fish Lagoon
Wind Chaos: 11
Wind Dir Chaos: 0.25
!Chronos!<
Wind Chaos: 8
Wind Dir Chaos: 0.21
Wind Chaos affect the wind speed change of the area. So for example Al'ankh will have stable wind strength, while Fire fish lagoon will either be no wind and 40 knots wind like proper ICTZ zone.
Wind Dir Chaos is the wind direction variation. The bigger the number, the bigger angle the wind can be different from Trade wind, thus also increase the chance that wind blow vastly differenct from tradewind.
Follow is the actual mechanics i understand from Pr0SkyNesis's explaning
Let's use Al'Ankh for example. In Al'Ankh trade wind is 45°, and you're currently riding this exact trade wind.
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Game pick random wind direction(WD1). Assume it's total opposite, 225°
-
Game calculate second wind direction(WD2) that is 25% of the distance between WD1 and trade wind angle.
225-45=180°, 180*0.25=45, WD2 would be 225-45=180°
- Game apply Wind Dir chaos to the distance between WD2 and current wind, final result will be new wind direction.
180-45=135°, 135°*0.14=18.9°, Final direction = 180-18.9=161.1°
Since we are calculating using the most extreme stituation. In Al'Ankh the biggest wind direction variation from Trade wind would be 161.1-45 = 116.1°
For Fire fish Lagoon, it's not explained but since there is no trade wind. I assume it just skip step one and only assign Wind Dir Chaos to current wind. So expect chaos.
If anyone know better on these topic, feels free to correct me!
Posted Jul 23, 2026, 5:02 AM UTC