Sail

Sailmakers may introduce sail twist in the design of the sail, where the head of the sail is set at a different angle of attack from the foot of the sail in order to change the lift distribution with height.

Optimum sail angle can be approximated by pulling the sheet in just so far as to make the luffing stop, or by using of tell-tales - small ribbons or yarn attached each side of the sail that both stream horizontally to indicate a properly trimmed sail.

Reducing or reefing the total sail area will have the same effect and many boats will sail faster with less sail in a stiff breeze due to the reduction in underwater drag.

Sail temperature also changes with solar distance and sail angle, which changes sail dimensions.

The force changes with solar distance and sail angle, which changes the billow in the sail and deflects some elements of the supporting structure, resulting in changes in the sail force and torque.

The magnetic sail introduces a magnetic field into this plasma flow which can deflect the particles from their original trajectory: the momentum of the particles is then transferred to the sail, leading to a thrust on the sail.

Thus the sail second up the mizzen-mast is the "mizzen topsail", and the third sail up the fore-mast is the "fore topgallant sail".

The province of North Holland is committed to Sail Den Helder and Pre-Sail Texel 2023.

The candidates may apply through the official website of SAIL, sail.

A 15-meter-diameter solar sail (SSP, solar sail sub payload, soraseiru sabupeiro-do) was launched together with ASTRO-F on a M-V rocket on February 21, 2006, and made it to orbit.

Another beam-pushed concept would be to use a magnetic sail or MMPP sail to divert a beam of charged particles from a particle accelerator or plasma jet.

A sail craft arriving at a star can use a close passage to reduce energy, which also applies to a sail craft on a return trip from the outer Solar System.

As of 2015, it was still under thrust, proving the practicality of a solar sail for long-duration missions. citation It is spin-deployed, with tip-masses in the corners of its square sail.

Homer's Odyssey In Homer 's Odyssey XII, Odysseus is advised by Circe to sail closer to Scylla, for Charybdis could drown his whole ship: "Hug Scylla's crag—sail on past her—top speed!

However, it need not be as massive as a solar sail because the solar wind is deflected by a magnetic field instead of a large physical sail.

In that way, they turn the sail. citation Thin-film solar cells are also integrated into the sail, powering the spacecraft.

In this scheme, a smaller secondary sail is deployed to the rear of the spacecraft, whereas the large primary sail is detached from the craft to keep moving forward on its own.

Laminated sail materials using polyester film achieve superior performance by using a lower stretch material that is better at maintaining sail shape but is still relatively light in weight.

More recently a combination of magnetic sail and electric sail was proposed by Perakis and Hein.

No explanation is offered as to how this could be accomplished with a square sail as the lower reefed portion of the sail would be very bulky and would prevent even an approximation of the laminar flow necessary for windward sailing.