@p5r3v1l said in PSA: Sloops are meant to be slower than Galleons, and this is why:
@ghroznak Or, as it is done today, when you have the freedom of a foresail and a mainsail that only extends to one side of the mast (I dont know the correct term), going downwind you do a butterfly (foresail and mainsail on different sides).
I do also understand the effect of the different sail shapes and how they are attached to the masts on the speed.
What I am wondering about and what I could not find Info on, is the actual real world speed of an old classic style galeon (traders, broad and not stretched body), compared to ships like a sloop. While I do understand the effect of the body above and under the waterline at least pushing the ship forward a bit when close hauled and the broad back pushing it forward when going downwind, I still think the huge body is a huge minus in terms of water resistance. They also have the hindmost sail stealing the wind when going downwind as you said.
Do you have any good sources for that?
You'll just have to google it up.
Several trading ships, like the Le Gros Ventre and the East Indiaman traders all sailed at decent speeds.
It's not really so much about how wide or large they are as it is about the shape of their hull/keel and their sails. Being heavy just means slower acceleration in order to get up to full speed. Also being heavier means your ship has more inertia and is thus harder to turn. That is just simple physics.
However, once you are up to speed you will keep that speed easier as the momentum of your ship will keep plowing straight through the water which doesn't offer much friction.
It's a bit like a freight train. It's slow to get going, but once it gets up to speed it will just keep going easily with little effort.
Another thing which puts it into perspective is how little force is needed to get something moving across water. One of the largest containerships in the world, the Madrid Maersk (https://en.wikipedia.org/wiki/Madrid_Maersk) can carry 206000 tonnes deadweight, while engines "only" provide 70,604 horsepower. That's 0,3 horsepower per tonne of deadweight.
Imagine a truck on the roads with 0,3 horsepower per tonne of cargo it carries. That would mean a truck dragging 50 tonnes of cargo would have an engine providing 17-18 horsepower.
Note: Those 0,3horsepower per tonne are also not taking into account the displacement of the ship itself, just the deadweight (cargo, water, fuel, crew, provisions etc).
The point is... it requires very little energy to get even extreme weights to move when on the water.