How do you calculate the speed of a boat?
The formula to calculate the speed is therefore: (L x 60) (T x 100) = V, where L is length in feet, T is time in seconds and V is speed in knots. For example, if on a 28ft yacht it took three and a half seconds to pass an object, the calculation would be : (28 x 60) divided by (3.5 x 100) = 4.8 knots.
How do you find the speed of a boat in still water?
Upstream and Downstream – Formula
- Upstream = (u−v) km/hr, where “u” is the speed of the boat in still water and “v” is the speed of the stream.
- Downstream = (u+v)Km/hr, where “u” is the speed of the boat in still water and “v” is the speed of the stream.
- Speed of Boat in Still Water = ½ (Downstream Speed + Upstream Speed)
How do you calculate hull speed?
As a very general rule the maximum speed of any displacement hull–commonly called its hull speed–is governed by a simple formula: hull speed in knots equals 1.34 times the square root of the waterline length in feet (HS = 1.34 x √LWL).
How do you measure the speed of a yacht?
Theoretical displacement hull speed is calculated by the formula: velocity in knots = 1.35 x the square root of the waterline length in feet.
What is the speed of the boat?
Boats and Streams Formula
| Upstream | (u−v) km/hr |
|---|---|
| Speed of Stream | ½ (Downstream Speed – Upstream Speed) |
| Average Speed of Boat | {(Upstream Speed × Downstream Speed) / Boat’s Speed in Still Water} |
| Speed of boat or swimmer in still water | 1/2 (Downstream Speed + Upstream Speed) |
What is the speed of the boat in still water and the speed of the current?
Answer: The speed of the boat in still water or ‘b’ = 10 km/h. The speed of the current or the river = 4 km/h. Therefore the speed of the boat when going upstream = b – r = 10 – 4 = 6 km/hr. Therefore the distance covered in one hour = 6/1 = 6 km.
What is a boats hull speed?
Hull speed or displacement speed is the speed at which the wavelength of a vessel’s bow wave is equal to the waterline length of the vessel.When hull speed is exceeded, a vessel in displacement mode will appear to be climbing up the back of its bow wave.
What is the hull speed of a sail boat?
Most sailboats cruise at a speed of 4-6 knots (4.5-7 mph), with a top speed of 7 knots (8 mph or 13 km/h).
How do you determine the pitch speed of a boat propeller?
The propeller revolution rate is determined by dividing the engine rpm by the gear ratio. The propeller rpm multiplied by the propeller pitch indicates the distance forward a boat will move forward every minute.
How fast does a 300hp boat go?
The numbers show that the triple 300 hp engines (900 hp total) have a power-to-weight ratio of 1.68 pounds per hp, while the twin 400s (800 hp total) calculate to 1.62 pounds per hp. With the triple 300XS outboards, the boat ran a top speed of 103 mph.
How fast will a 200hp boat go?
You can expect speeds between 18 and 28 miles per hour for a 90 HP pontoon boat and speeds of between 37 and 45 miles per hour for a 200 horsepower pontoon boat.
How do I find the speed of a current?
Answer
- The distance going upstream and downstream is the same.
- Time going upstream is 3 hours.
- Time going downstream is 2 hours.
- Speed of the boat (r) is 5 miles per hour.
- Distance (d) = rate (r) X time (t)
How do we find speed?
The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time. In this example, distance is in metres (m) and time is in seconds (s), so the units will be in metres per second (m/s).
How do you find the speed of a current?
To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time. To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.
What is the speed of the boat in downstream?
So in case of downstream the speeds will be added, while in case of upstream the speeds will be subtracted . The speed of boat downstream is equal to the sum of the speed of the boat in still water and speed of the stream .
How do you calculate average speed in a boat and stream?
How To Calculate Average Speed
- To get average speed, s , divide total distance by elapsed time: Dt. D t.
- To get elapsed time, t , divide total distance by speed: Ds. D s.
- To get distance, D , multiply speed times the amount of time: s × t.
How do you find the speed of a boat in upstream?
And, the direction against the stream is called upstream. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. Speed upstream = (u – v) km/hr.
What is the speed of the stream if a boat travels at a speed of 8km hr?
The speed of the stream is 6 km/h. The time (in hours) taken by him to row a distance of 76.8 km downstream is: Q5. A person rows upstream a distance of 55 km in 5 hours and rows downstream a distance of 75 km in 3 hours.
How do you measure the speed of a river?
To get your total speed, you have to add your paddle speed to the river speed for total miles per hour. Paddle speed is usually 2 to 3 mph for most people on average over time, on a leisurely non-racing trip. So, river speed of 3 mph + paddle speed of 2 mph = 5 mph total.
What makes a boat fast?
A boat’s ability to go fast is a balancing act between its length and the power driving it, whether supplied by wind or engine…A boat moving through the water creates a pattern of waves, including one along the vessel’s side that produces a crest of water at the bow and a trough at the stern.
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