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 fast will a 150hp boat go?
fiberglass bass boat powered by a 150-hp outboard will have a WOT speed in the 50-mph range, and will have its most economical cruise in the mid-30s with two people aboard.
How do you calculate boat rpm speed?
- Formula: (RPM x Ratio) x Pitch = inches per minute. Recommended. 10 MUST-HAVE Boat Trailering Tools.
- 19-inch-pitch Prop. (5,000 x 0.5) x 19 inches = 47,500 inches per minute. 47,500/12 = 3,985 feet per minute.
- 21-inch-pitch Prop. (5,000 x 0.5) x 21 inches = 52,500 inches per minute. 52,500/12 = 4,375 feet per minute.
How fast does a 500hp boat go?
Top speed is 55 mph, and the boat is said to be capable of spinning in its own length and is maneuvered via joystick controls.
How do you calculate boat speed? – Related Questions
How fast can a 350 hp boat go?
Flat out the 350hp boat recorded a two-way average of exactly 50 knots – fully 10 knots quicker than the 300hp boat.
How fast does a 330 hp boat go?
The 330 Outrage had a top speed of 45.4 kts at 6400 rpm with a fuel burn of 60.5 gph. We reached planing speed in 3.9 seconds and continued through 30 mph in 8.9 seconds.
How fast can a 400 hp boat go?
As for performance numbers, the twin 400 Verados pushed the Axopar 37 to a top speed of 62.7 mph at 6,800 rpm, burning a combined 76 gph.
How many hp is a boat mph?
As speed is directly related to power, there is a simple equation that uses speed to determine a boat’s horsepower measurement: One unit of horsepower will move 40 pounds of boat weight at 20 mph. For a 2,000-pound boat to reach 20 mph, it needs 50 horsepower.
How fast does a 225 hp boat go?
Tipically, my friends boats from 21-26 foot ,with twin 150-225 hp engines will do from 45 to 54 mph.
How is hp boat speed calculated?
The speed of a boat having an engine to deliver P horsepower and displacing D pounds is written as: S = Speed = sqrt(P / D) * C , where S is the boat speed and C is the Crouch constant. The above equation is known as Crouch’s formula.
How fast can a 40 hp boat go?
A 40hp Pontoon boat with an average load of people can expect to reach speeds of around 10 – 15 mph.
Is 35 mph fast for a boat?
Even under full load conditions, you can go to 30 mph. From my experience, the optimum speed for water sports is 15 to 35 mph. So your pontoon might be a little slow but will be just fine for any water sports you like to do.
How fast will a 25hp outboard go?
A 25hp Pontoon boat will not be very fast, with an expected maximum speed of between 5 and 10 mph. Most commercially accessible pontoon boats tend to average between 18 and 25 mph, although there are a few very quick production boats on the marketplace, plus some altered ones that have recently set world records.
Is 25 hp enough for 16 ft boat?
You have to check the specs on the dry weight of the hull. A thinner gauge hull,such as the Lund Rebel 16′ with a . 065 aluminum only weighs in at 400 some pounds. add your people and gear and A 25 hp will move that around just fine.
How fast does a 15hp outboard go?
Two stroke 15 yamaha pushes my 3.7 tinnie along at 15 – 17 knots, depending on the tide.
How fast can a 12 ft jon boat go?
12-foot jon boats have an average weight capacity of 420 pounds and an average maximum horsepower of about 5 to 7 HP, however, some models allow up to 10 HP. A 5 HP motor is expected to have a top speed of 10mph. 7 HP could have 15mph or more. This speed is great when riding in slower moving rivers and streams.
15 to 25 HP engine
12 to 16 feet (3.65 – 5 m) long Jon boat, fiberglass boat, and aluminum fishing boat.
How much hp does a 14ft boat need?
It depends on the boat. Some 14’s are wide and deep and could handle a 25 while others are narrow and shallow and would be scary at any higher speed or even sitting still with all that weight. A 15 hp is a good compromise, same weight as a 9.9 and enough speed.
How fast will a 9.9 hp outboard go?
Assuming this is a light 14′ utility boat and a standard 9.9, Mercury would recommend a 8.5 to 9.5 pitch prop for the OP’s application and predicts a top speed around 20 mph. In my experience with similar craft and outboards, this sounds very reasonable.
Why is 9.9 hp not 10 hp?
As you may have already noticed, many manufacturers supply 9.9 HP boat motors instead of 10 HP. There are good reasons behind those 9.9 HP motors: Some inland bodies of water have motor restrictions “under 10HP” only. Some states will require boat registration on boats with larger than 10 HP outboard motors.