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05.06.2021 23:44:57
The time, or more precisely, the duration of the trip, can be calculated knowing the distance and the average speed using the formula: [links]
See full version: Speed, Distance & Time Calculator
The time, or more precisely, the duration of the trip, can be calculated knowing the distance and the average speed using the formula: [links]
where v is the velocity (average speed), t is the time and d is distance, so you can read it as Distance = Speed x Time. The result will depend on the unit of the speed metric, for example if speed is given in mph, the result will be in miles, if it is given in km/h, the result will be in kilometers. As usual, make sure that the time unit of the speed measure is the same as the time unit for the duration of the trip. Our distance calculator will sometimes output the distance in more than one unit, for your convenience. here
The formula for average speed, also called average velocity in physics and engineering, is:
Example: If a train can travel 500 miles with an average speed of 50 miles per hour, how long it would take it to complete a 500-mile route? The answer is 500 / 50 = 10 hours.
where d is the distance travelled, v is the speed (velocity) and t is the time, so you can read it as Time = Distance / Speed. Make sure you convert the units so both their distance and time components match, or use our trip duration calculator above which will handle conversions automatically. For example, if you have distance in miles and speed in km/h, you will need to convert speed to mph or distance to kilometers. The time unit of the result will match the time unit of the speed measure, so if it is measured in something per hour, the result will be in hours. If it is measured in some unit per second, the result will be in seconds.
To increase acceleration, consider reducing your pitch. This makes particular sense if you are NOT hitting the max RPM level established by the engine manufacturer when running at Wide Open Throttle (WOT) with your current prop. To see the potential impact on top speed, enter your current values for Max RPMs, Gear Ratio, Pitch and Prop Slip in the Boat Prop Calculator tool. Then, decrease the pitch by an inch or two. However, as you do this, you should increase your RPMs by approximately 200 for each 1″ reduction in pitch (until the maximum RPM rating is reached). here
Conversely, to increase top speed, consider increasing your pitch. This is especially relevant if you ARE hitting the max RPM level established by the engine manufacturer with your current prop. However, it is hard to tell whether your RPM level is the best your engine can do or if it is being capped by the engine’s rev-limiter (to protect the engine). If it is the later, then you likely have room to improve your top speed. If it is the former, then it might not make much difference after you account for the fact that each 1″ increase in pitch will result in approximately a 200 decrease in RPMs.
All marine propellers involve a tradeoff. If you prop your boat to maximize top speed, acceleration will be compromised and visa-versa. Therefore, the first consideration is whether to optimize top speed, acceleration or some combination of the two. [links]
Knowing the theoretical speed for your boat can help you select the proper pitch. To use our boat prop calculator, you need four inputs:
Of course, most boaters will want something that is in between – good hole shot with acceptable top end speed. Just be sure that whatever size prop you use your engine operates within its recommended RPM range. here
The second concern, says Chang, is operator security. here
So why does the power-rating mandate end at 20 feet in length?
“With a steering wheel, it takes a pretty deliberate motion to change course,” says Chang. “The tiller is connected directly to the motor, and it’s much easier to make an inadvertent course change.” [links]
90hp is max for this tiller-driven boat.
“With the operator sitting further aft at the tiller, the boat is not in ideal trim,” says Chang. “He also can’t see forward as well, and the boat may be more prone to porpoise.” here
Boating is fun but it can be even more fun when you are aware of how things work. Getting more familiar with how your boat does the wonderful things it does can only enhance your experience on the water.
The rate of speed of the propellor moves in direct proportion to the water’s speed as it moves by your boat. [links]
One eHow contributor goes on to say, “By using land coordinate information provided by satellites, GPS devices can measure how quickly a boat is traveling based on how much distance it is putting between itself and two or more points.” If your boat’s GPS system is accurate, this is actually the most exact measure of your boat’s speed.
If you are lucky enough to have a boat, you know the fun and relaxation you can have while skimming the waters. But are you aware of exactly how everything works on your boat? Here is a little information that you might find interesting and helpful. here
It is different than your car’s speedometer in that way. Cars move over a stationary surface and boats move over water, which is also in motion. Submarines also use a pitometer to measure boat speed. A tube goes through the hull of the boat and into the water. There are two openings in the tube. One measures the water speed as it moves through the tube, and the other measures the water pressure. These two numbers put together give you the exact speed of the boat.
Posted February 4, 2014 by scsgearbox & filed under Speedboat Racing.
Boat Speed = The Square Root of ( Shaft Horsepower / Weight ) x Constant
When using the above boat speed formula bear in mind that: more
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