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Crunching Numbers: Hull Speed & Boat Length - myboat300 boatplans
This page provides important Boats and Streams Formulas, Tips, and Tricks using which you can solve questions asked in competitive and entrance exams easily.� In other words, the direction against the river current is called upstream. If the speed of motorboat in still water is x km/hr and the speed of stream is y km/hr then Upstream Speed = (x - y) km/hr. When Average Speed Of Boat Formula 500 the boat goes with the current of the river is referred to as Downstream. In other words, the direction along the river current is called downstream. If the speed of motorboat in still water is x km/hr and the speed of stream is y km/hr then Downstream Speed = (x + y) km/hr. In the question, you will be given downstream speed and upstream speed and asked for speed of a boat in still water and. A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer than the trip downstream, then how many hours did it take the boat to travel downstream?� If the upstream trip took half an hour longer than the downstream trip, how many hours did it take the boat to travel downstream?. Average boat speed matters. Fast, slow or in between, you should know how fast boats can go. See examples of average pontoon, cruiser and sailboat speeds here!� Even that�s quite a bit faster than the average boat speed, and unless you�re considering a career in smuggling, it�s probably quite a bit faster than you need to travel over the water, anyway. So, let�s talk about average recreational boat speed statistics that are a bit more practical. Why Boat Speed Matters. Going fast in a boat can be lots of fun.

Dave warns, however, that catamarans with very narrow hulls for mysterious reasons that no one really understands will often exceed the speeds predicted by his method.

What the classic hull-speed formula assumes is that 1. Plug 1. This in itself is an appreciable difference, but it grows even larger as the boat grows lighter. Dave further warns that getting the extra hull speed his method predicts will require a lot of extra power, but he does maintain that his method is ultimately more accurate than the old one.

I, for one, happen to believe him. Unless you own a classic CCA-style cruiser with long overhangs. In cases like this, I always assume the classic hull-speed formula is more accurate. Let me give you an examples. There is no way her hull speed is 62 knots. The QM2 has , shp delivered via her four mermaid pods or about 1. In service she is a 28 knots vessel which reached 30 knots during her trials. Again, there is no way her Hull Speed is 60 knots. Great article but I have a question.

How can this be applied to displacement hulls? Specifically to kayaks or surfskis. Does the constants and formulas hold true for this kind of vessels? According to the standard hull speed calculations, it has a theoretical hull speed of 5. However, if I try to use these formulas, the Boat Speed comes to Its creator, an olympic medallist, is able to push it to 7.

One boat has a 24 ft waterline and the other I assumed the longer wl would give me a bit more speed as the old formula shows. However the longer WL boat also displaces 1, lbs more so by this new formula the shorter boat has the same theoretical hull speed. Good to know. Raise that to the power of. Save my name, email, and website in this browser for the next time I comment.

Please enable the javascript to submit this form. Related Posts. Lit Bits. Charles Doane December 18, Charles Doane November 19, I love your blog.

Something clearly needs to be adjusted for it to apply to small displacement hulls. I get Leave a Reply Cancel Reply. Google Ads.

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