Quality sails on yachts are made of high grade duck cloth or canvas. There are also some quality plastic sails, but they are quite unusual to see in use.
A yacht is smaller and designed to be propelled by sails.
The sails or the engine, depending on the yacht.
No , the sails are called the sheets. Wrong - the sails are called SAILS. The control lines to the sails are sheets.
A yachtsman is a man who sails a yacht.
OMFG. That is your answer.
Most yachts employ both a propulsion device and sails.
A yachtman is another term for a yachtsman, a man who sails a yacht.
An afterguard is a collective term for the members of a yacht's crew who attend to the aft sails.
In the past, sails were made out of a material called 'sailcloth' or 'canvas' which was originally made from hemp/flax fibers (linen). After the discovery of cotton this too was used as the source of fiber. In modern times, sails are rarely made from natural fibers and most sails are now made from synthetic fibers including nylon, polyester, aramids and carbon fibers. These sails are stronger and will not let the wind though. (In the past sail canvas had to be sluiced down to make it impervious to the wind - this made the sails and rigging heavy).
Made of six to twelve sails covered in reed matting or cloth material
Ernest A. Ratsey has written: 'Yacht sails, their care & handling'
Arthur J. Fisher has written: 'The geometry of yacht sails' -- subject(s): Aerodynamics, Design and construction, Sails, Yachts