What is a layline in sailing?
In sailboat racing, a layline is an imaginary line extending from the objective (typically a racing mark) to indicate the point at which a boat should tack or gybe in order to just clear the mark on the correct side (weather side if upwind [tacking], leeward side if downwind [gybing]).
Are ley lines?
Ley lines (/leɪ/) refer to straight alignments drawn between various historic structures and prominent landmarks. The idea was developed in early 20th-century Europe, with ley line believers arguing that these alignments were recognised by ancient societies that deliberately erected structures along them.
How do you find good velocity?
The northward component of the boat’s velocity vector is found by multiplying the boat speed (VB) by the cosine of the angle between the true wind direction (north) and the sailboat’s heading. In this case, the optimal VMG is obtained on a heading of 60 degrees from the true wind (60 degrees NE or 300 degrees NW).
What is velocity measured in?
Since the derivative of the position with respect to time gives the change in position (in metres) divided by the change in time (in seconds), velocity is measured in metres per second (m/s).
What is it called when you sail into the wind?
Sailing Upwind As you steer more toward the wind direction, you trim the sails in tighter to keep them full, and keep generating lift. But sail too close to the wind and the sail will “luff”— the forward edge will start to flutter in and out and the boat will slow down.
Why does starboard tack have right of way?
Port tack gives way to starboard tack: If two sailboats are approaching each other and the wind is on a different side of each boat, then sailing rules are that the sailboat which has the wind on the port side must always give right of way to the other.
Who has right of way starboard or port?
1. If another vessel is approaching you from the port — or left — side of your boat, you have the right of way and should maintain your speed and direction. 2. If a vessel is aiming to cross your path and they’re on your starboard — or right — side, they have the right of way.
Who has the right away when sailing?
Rule 1: When you are on the same tack as the other boat, the leeward boat has the right-of-way. Rule 2: When you are on opposite tacks, the starboard tack boat has the right-of-way. Rule 3: If you are overtaking the other boat, or it is overtaking you, the boat ahead (the overtaken boat) has the right-of-way.
How do you know who has the right away?
If you reach an uncontrolled intersection at close to the same time, the vehicle who actually reached the intersection last is the driver who must yield the right of way. If you reach the intersection at the same time, the driver on the left should yield the right of way.
What boating emergency causes the most fatalities?
Collision and crew-overboard incidences account for most of the fatalities. Injuries occur more frequently — somewhere around 100 per 100,000 registered boats.
What is the best type of anchoring line?
For most docking and anchor lines, standard nylon is a good choice. It has great strength, “gives” under load to absorb energy, and is relatively inexpensive. It’s also easy to handle and resists the harmful effects of sunlight better than other synthetics. It’s the rope of choice for anchoring rode.
How heavy should my anchor be?
As a general rule, a holding power of 90 pounds is sufficient for safely anchoring a 20′ boat in winds up to 20 mph. For the same wind speed a holding power of 125 pounds is adequate for a 25′ boat.
Do ships anchor at sea?
Simple answer, they don’t. An ocean-going yacht will carry 2–400′ of anchor chain. Vessels need at least three times the depth of chain because for the anchor to hold, it needs to be pulled at an angle to the seabed. So you will not see any vessel anchored in more than 200′ or so of water.
Are boats grounded from lightning?
To protect yourself in a boat, the important thing is to give lightning a ground. Boats made of steel, such as naval vessels, have an automatic ground in their metal hulls; but most small boats, usually constructed of fiberglass or wood, prevent the lightning easy access to the water and pose a grounding problem.
Are ships safe from lightning?
A lightning strike to a vessel can be catastrophic, especially if it results in a fire or loss of electronics. If your boat has a cabin, then stay inside and avoid touching metal or electrical devices. If your boat doesn’t have a cabin, stay as low as you can in the boat.
What should you do if you are caught in a lightning storm?
Seek shelter immediately even if caught out in the open
- Immediately get off elevated areas such as hills, mountain ridges, or peaks.
- Never lie flat on the ground.
- Never shelter under an isolated tree.
- Never use a cliff or rocky overhang for shelter.