the shape dose effect it.
This will depend on a couple different things: ~boat ~wind pressure ~type of sails they can all change how fast the boat is going and in which direction
Yes, to a huge extent
Yes
It depends on many factors. The hull shape, how the sails are rigged, how much sail area you have, the ability of the crew, the wind speed, the tide.
how does the area of the sail affect how a model boat sail
No one can say who, where or when the first sail was made. Consequently its shape is not know either.
shape, size, and speed
It varies widely. The speed depends on factors such as hull shape, type of rigging, crew experience. the weight varies from a few kilos to many tons
shape, size, and speed
Not as much as the shape of the car but different finishes do affect drag.
diamond