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+ Waves ideas in | boat, sailing, yacht Motorboat waves differ from wind generated waves in several important ways. They are often steeper and closer together (and therefore can potentially hurt your speed much more). Boat waves typically hit you at strange angles (rather than straight with the wind). And, fortunately, they usually come and . May 31, �� These waves reach the boat once every: A motor boat covers the distance between the two spost on the tiver in down stream and upstream respectively. Find the time required by the boat to cover this distance in still water. A boat at anchor is rocked by waves whose crests are m apart and velocity is 25 m/s. Oct 13, �� We tend to stay calm and collected when it comes to tricky situations. We believe that IS the only safe way to get things done, on Day 10, these were the big.
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When I'm racing, I categorize the wave state in three general ways: 1 Normal waves for the wind; 2 More wind than waves; and 3 More waves than wind. Here's a closer look at each. It's great or painting and speed, and makes staying in the 'groove' pretty easy. When you have more wind than waves, you can trim your sails flatter and harder than you normally would in that breeze. You should sail most boats as flat as possible and go for maximum height pointing. It makes finding the groove difficult, and it quickly separates the good sailors from the rest.

When you have more waves than wind, be careful about trimming too hard or pointing too high. Err on the side of twist, power and footing so you keep going fast. Watch for leeway caused by waves Waves make sailboats go up and down, and they also push boats to leeward. The difference between the course you steer and the course you make good through the water is your leeway angle.

The size of this angle is a result of many factors such as heel angle, wind velocity, boat design and wave height. Though leeway for racing boats is usually not more than a few degrees, it will get slightly larger as the waves get bigger.

The main place where you will notice leeway is in relation to fixed objects like marks. Your laylines are wider, for example, in waves, so you must allow a little extra distance before tacking. One place where it's easy to see how much the waves push you to leeward is at the starting line. When boats attempt to luff in place on the line, they often slide much farther to leeward than they think. That's one reason why there is often a significant line sag when the waves are big. Except for those few times when you are able to ride a motorboat wake coming from behind, waves are never helpful when you're racing upwind.

It's always faster to sail in flatter water, and that should be your first rule of thumb on beats. Sailing fast in waves requires a team effort that involves the driver. You have to look ahead for waves that are coming, shift gears and find the best way to steer through them. There are three basic strategies for dealing with waves upwind. You can sail directly through the waves, steer over the waves, or try to avoid the waves. More likely, you will do some combination of the above.

Going straight through waves is usually the best option when the waves are everywhere and too small to steer around. The bigger and heavier your boat, the more likely you are to take this approach since it's often impossible or slow to turn your rudder for individual waves. This is not a great option for bigger waves, but sometimes it is your only choice e. In that case, try to keep the boat going a little faster than usual up the beat. The most costly mistake is to be too slow when you hit a bad wave.

Anticipation is important. The key to maintaining speed through bad waves is to shift gears before you get to them. That means you need enough warning to power up your sail plan before the bow digs into the first wave. Steering over the waves is a good idea when they are larger and spaced farther apart, and when going straight through them is slow. The smaller and lighter your boat, the more effective this is.

The basic technique for sailing over waves is to head up on the front side and bear off the back side. In other words, luff toward the wind a little as you go up the wave and then bear off away from the wind as you go down the back side.

The steeper the wave and the faster your speed over the waves, the more sharply you will have to turn your helm and your boat. In boats that are light enough to be affected by the positioning of crew weight, combine the steering with a rotational movement of your bodies: Lean aft and maybe in a little as you go up the wave.

Then lean out and forward as you go over the top and down the back side. Avoiding waves is always the preferred option. This works well when you have identifiable areas of bad waves, such as boat wakes or sets of especially large, steep waves. Since you can never avoid all waves, you must use this in concert with other ways to sail through waves but this strategy should always be a part of your upwind plan.

The techniques that work best in waves are often subtle enough that you never know how well they are working until you measure your performance against nearby boats. So test your wave strategy before the start and continue to evaluate it during the race. If you're not fast, change something and try again! Put your weight in the right places One of the reasons why waves make a boat go more slowly is because they cause it to 'hobbyhorse,' which disrupts the air flow around its sails and the water flow around its foils.

This is especially harmful in lighter air. The main goal of positioning your weight in waves, therefore, should be to reduce hobbyhorsing.

Keep your crew together as much as possible and near the middle of the boat. In light air, the ideal spot is right at the top of the keel, since that is the point around which the sail plan, hull and foils pivot. When conditions are bumpy and light, it's not unusual for crews to sit down below on the cabin sole in bigger boats or to crouch down inside the cockpit onedesigns. In heavy air the crew can't be inside the boat, of course.

Instead they should sit tightly together like the crew on the boat above. The fore-and-aft position of their weight depends on the boat, wind strength and wave shape. Generally, the crew should be at least slightly farther aft when it's rough than when it's flat with the same wind velocity to keep the bow from plowing into waves.

If you're racing upwind in waves and you think your weight is positioned perfectly but you aren't going fast, try moving your crew a little farther apart. How much to steer in waves! When you're sailing upwind, waves will always slow you down, so you should avoid them as much as possible see below. However, when you turn your rudder to steer around waves, the drag you create will also make you go slower.

Therefore, you are always searching for the optimal tradeoff between using a lot of rudder and missing waves versus using less rudder and hitting waves. The only true way to judge whether you are doing a good fast job of this is by comparing your performance to that of a nearby boat. That's why it's critical, when you have waves, to train with another boat if possible and to tune up with a competitor before every race. While you are doing this, try different steering techniques to see what is fastest in the unique conditions that you have on any day.

The last thing you want to do in a wavy race is to be looking for the groove as you come off the starting line. Several factors influence the tradeoff of how aggressively you should steer i. How steep and close together are they? In an orbital motion, the angular momentum vector is System of Particles and Rotational Motion. A sphere of mass M and radius R is falling in a viscous fluid. The terminal velocity attained by the falling object will be proportional to Mechanical Properties of Fluids.

Two springs are connected to a block of mass M placed on a frictionless surface as shown below. If both the springs have a spring constant k, the frequency of oscillation of the block is Oscillations. Questions from Waves.

The phase difference, between the prongs of a tuning fork is. The phase change between incident and reflected sound wave from a free end is. The equation that does not represent wave motion is. A source of sound is in the middle of the line joining the position of two persons 'A' and 'B' Air is blowing from 'B' to 'A'. Quality of sound primarily depends upon.

The intensity of a wave is a proportional to square of the frequency b proportional to the velocity of wave c proportional to the density of the medium d proportional to the square of the distance of the source from the observer. The relation between the intensity I of a wave and on the distance r from a line source is.

Loudness of sound primarily depend upon. According to Laplace correction, the propagation of sound in gas takes place under. Physics Most Viewed Questions. The phase difference between displacement and acceleration of a particle in a simple harmonic motion is: NEET Oscillations. The energy equivalent of 0. Two cylinders A and B of equal capacity are connected to each other via a stop clock.

A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated.

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