Thames & Kosmos Wind Racer handleiding
Handleiding
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GEEK
OUT!
THE PHYSICS OF
THE SAILING
Let’s get a little more in depth on how sails work. A boat’s
keel — the large flat structure on the bottom of the boat
that runs parallel to the direction of motion, so it easily
glides through the water forward and backward, but resists
movement from side to side — is critical to the boat’s
forward motion through the water. When the boat is running
downwind, the wind simply pushes on the sail and pushes
the boat forward through the water.
But when the boat is sailing into the wind,
the forward motion of the boat relies on the
counteracting forces on the sail and on the keel.
The velocity of the wind (relative to the boat) on
the sail generates a lift force (see page 16) which
is perpendicular to the wind. The lift combined
with the drag force, which is parallel to the wind,
create a resultant force on the sail.
At the same time, underwater, the velocity of
the water (relative to the boat) creates a lift force
on the keel, which acts like an underwater wing.
The force on the keel combined with a drag force
from the keel and the water creates
a resultant force underwater.
Velocity of wind
Motion
of boat
Motion
of boat
Velocity of wind
Above water
Lift
Drag
Resulting force
on sail
Velocity
of water
relative
to boat
Underwater
Drag
Resulting
force on sail
Force
on keel
Resulting
force (Force
on keel plus
drag)
Resulting
force on
keel plus
drag
When this resultant force is equal and opposite
to the resultant force on the sail, the boat will not
accelerate or decelerate — it will stay traveling at the
same velocity. If one of the forces changes, the boat
will either accelerate or decelerate accordingly.
When the boat is moving fast with the wind
coming at an angle from the front, the velocity of the
wind relative to the boat is actually much faster than
the velocity of the wind relative to the water. This is
called apparent wind, and it is why traveling into the
wind is faster than running downwind.
The boat can never travel directly into the wind,
so in order to keep moving upwind, sailboats must
tack, or quickly move the bow to the other side.
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Wind Racer |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5764 MB |
