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Try pushing the boat from one side of the tub to the other and perpendicular to the flow of water. Which way do you need to push the boat so that it ends up immediately opposite? Compare the directions of the flow of water, heading of the boat, and actual velocity of the boat. Example 1. Adding Velocities: A Boat on a River. Figure 4. A boat attempts to travel straight across a river at a speed m/s. The current in the river, however, flows at a speed of m/s to the right.� Because the initial vertical velocity is zero relative to the ground and vertical motion is independent of horizontal motion, the final vertical velocity for the coin relative to Speed Of The Fastest Boat In The World Mod Apk the ground is vy = m/s, the same as found in part (a). In contrast to part (a), there now is a horizontal component of the velocity. � ������� ������ ��������� ����� ��������� � ���� ������� ��������������. If the boat was at full sail, and you ran the motor at the same time, would the boat reach a speed of 15 knots? Would it stay at 10 knots since the motor could not propel the boat above 5? Or would the speed actually decrease to below 10 knots due to the friction between the motor and the water?� When no water is flowing along the axis of the propeller (zero boat speed) the blades cut through the water at their full angle of attack. As the axial speed of the water increases the effective angle of attack decreases. Propellers are designed to work over a range of angles of attack as determined by the rotation speed and the expected maximum axial flow.

Many new boaters often ask the question, "what does 'trim' mean"? Knowing what it means to trim a boat, and how to properly trim a boat, will improve its performance and fuel economy.

Trim is simply the running angle of the boat as it makes way in the water; when we adjust the trim we are either raising or lowering the bow the front of the boat. Learn More: How to Drive Boat. Negative trim�when the trim is all the way down�is used to help get the boat on plane as it accelerates away from dead in the water. The angle of the propeller thrust will help lift the stern and push the bow down so that the boat rolls smartly up onto the water. Try to power on plane with the drive trimmed out, and the prop will dig a hole behind the boat and the bow will point skyward, probably blocking your view forward, as the boat struggles to plane.

You may get on plane eventually, but you are wasting fuel and putting undue stress on the engine. Eventually you may over-trim and raise the drive or outboard so far that the prop begins aerating and losing bite on the water�boat speed will decrease even as engine RPM increases. Bump the trim button down a little and the prop will hook back up with the water. Either trim down a little until the porpoising stops, or increase boat speed slightly to create more lifting force under the hull.

In rough water, especially with a head sea, trimming down will soften the ride by allowing the sharper deadrise of the forward bow to slice through the chop. Automatic trim systems, a feature of many newer boats that can also often be added as an accessory, effectively manage the trim based on boat speed and throttle setting. Boats powered by smaller outboards may not have a power trim system, but the trim can still be adjusted manually by moving a pin in the motor bracket.

Skip to content. How to Trim a Boat.

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