Helena Frye
A boat speedometer works by measuring the speed of the water passing by the boat. There are four main types of speedometers: pitot tube, paddle wheel, GPS, and electric sensor. A traditional boat speedometer uses a pitot tube to measure the speed of the water passing by the boat. The pitot tube is a long, thin tube that is open at one end and has a small hole in the other end. The tube goes through the boat's hull and down below into the water. As the boat moves, water enters the tube through one hole, and the speed of the water entering this hole is measured. The second hole measures the water pressure. The change in air pressure is measured by a gauge at the end of the tube on the boat's dashboard.
| Characteristics | Values |
|---|---|
| How it works | Measures the speed of the water passing by the boat |
| Types | Pitot tube, paddle wheel, GPS, and electric sensor |
| Pitot tube | A long, thin tube with one open end and a small hole in the other end. It is placed in the water so that the open end is facing the direction of the water flow |
| Pitometer | Compares the speed of the boat against the speed of the water by measuring the speed of water entering a tube and comparing it to air pressure |
| Manual speedometers | Display how fast you're moving on the water, with a pressure gauge on the dashboard |
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What You'll Learn
Pitot tube speedometers
A boat speedometer works by measuring the speed of the water passing by the boat. One of the most common types of speedometers is a pitot tube speedometer. This type of speedometer uses a long, thin tube that is open at one end and has a small hole at the other. The tube is placed in the water so that the open end is facing the direction of the water flow.
The pitot tube speedometer relies on tubes under the boat to help gauge speed. The tube goes through the boat's hull and down into the water. There are two holes in the tube. As the boat travels, water enters the tube through one hole, and the speed of the water entering this hole is measured. The second hole measures the water pressure. The water entering the tube forces air up the tube, and the change in air pressure is measured by a gauge at the end of the tube on the dashboard.
The speed of the boat is determined by how much water is in the tube versus the air pressure. The air pressure will fluctuate up and down according to the speed of the boat, and this variance in water speed and pressure is then translated into the speed shown on the boat's speedometer.
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Paddle wheel speedometers
A boat speedometer works by measuring the speed of the water passing by the boat. One of the four main types of speedometers is the paddle wheel.
One disadvantage of paddle wheel speedometers is that they can be affected by debris in the water, such as seaweed or floating rubbish. If the paddle wheel becomes clogged or obstructed, it may not spin freely, resulting in inaccurate speed readings. Regular maintenance and cleaning are therefore important to ensure the paddle wheel functions correctly.
Overall, paddle wheel speedometers offer a reliable and affordable option for boat owners looking to monitor their vessel's speed. While they may not be as precise as GPS-based systems, they provide a good balance of accuracy and affordability for recreational boaters.
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GPS speedometers
A boat speed gauge works by measuring the speed of the water passing by the boat. There are four main types of speedometers: pitot tube, paddle wheel, GPS, and electric sensor.
One disadvantage of GPS speedometers is that they may not work in areas with poor satellite reception, such as in remote locations or under bridges. In these cases, a traditional pitot tube speedometer may be more reliable.
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Electric sensor speedometers
One type of electric sensor speedometer is the electric paddle wheel. This works by measuring the force of passing water that turns a paddle wheel. The paddle wheel is attached to the back of the boat, and a sensor is mounted on the front. The paddle wheel spins as the boat moves through the water, and the sensor measures the speed of the paddle wheel. The speed of the boat is then displayed on a readout.
The electric paddle wheel is very similar to measuring the rotation of tyres in a car to determine speed. However, it is vulnerable to outside elements, and its accuracy can be affected by weeds or marine growth clogging the wheel.
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Manual speedometers
A manual speedometer on a boat works by measuring the speed of the water passing by the boat. Manual speedometers are a popular option for boat owners because they display how fast you're moving on the water.
A manual boat speedometer relies on something called a pitot tube, also known as a pitometer. This is a long, thin tube that is open at one end and has a small hole in the other end. The pitot tube is placed in the water so that the open end is facing the direction of the water flow. The tube goes through the boat’s hull and down below into the water.
As the boat travels, water enters the tube through one hole. The speed of the water entering this hole is measured. The second hole measures the water pressure. The water entering the tube forces air up the tube as well. The change in air pressure is measured by a gauge at the end of the tube on your dashboard. The speed of the water entering the tube is compared to the air pressure to give an estimated speed figure.
The speed of the boat determines how much water is in the tube versus how much air pressure. The air pressure will fluctuate up and down according to the speed of the boat. This variance in water speed and pressure is then translated into the speed shown on the boat’s speedometer.
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Frequently asked questions
A boat speed gauge works by measuring the speed of the water passing by the boat.
There are four main types of boat speed gauges: pitot tube, paddle wheel, GPS, and electric sensor.
A pitot tube speed gauge works by measuring the speed of the water entering the tube and the water pressure. The change in air pressure is then measured by a gauge at the end of the tube on the boat's dashboard.
A GPS speed gauge uses global positioning satellites to accurately measure the speed of a boat.
