Posted on 08/22/2019 11:41:34 AM PDT by DUMBGRUNT
"Seeing the pictures appear on the computer screen was the best day at work I've ever had," says Simen Ådnøy Ellingsen, an associate professor at NTNU's Department of Energy and Process Engineering.
39 degrees It has long been assumed that the angle of the v-shaped wake behind a boat should always be just below 39 degrees, as long as the water isn't too shallow. Regardless whether it's behind a supertanker or a duck, this should always be true. Or not. For like so many accepted facts, this turns out to be wrong, or at least not always the case. Ellingsen showed this.
Boat wakes can actually have a completely different angle under certain circumstances, and can even be off-centered with respect to the direction of the boat.
(Excerpt) Read more at phys.org ...
Indeed but Boat Wake Angles is a great name for a rock band.
Sufficient shallowness of the water can make the wake disappear altogether.
hehehe... yes it would be... especially if the germans wanted it changed very quickly...
I knew it was sarcasm, pix was a comment on the thread not you.
That doesn’t seem right.
Whatever floats your boat, Simen.
Being easily amused, this is fun for me!
If a chicken and a half lays an egg and a half in a day and a half, how many eggs will three chickens lay in thirty days?
Kelvin wake pattern
Waterfowl and boats moving across the surface of water produce a wake pattern, first explained mathematically by Lord Kelvin and known today as the Kelvin wake pattern.[1]
This pattern consists of two wake lines that form the arms of a chevron, V, with the source of the wake at the vertex of the V. For sufficiently slow motion, each wake line is offset from the path of the wake source by around arcsin(1/3) = 19.47° and is made up of feathery wavelets angled at roughly 53° to the path.
The inside of the V (of total opening 39° as indicated above) is filled with transverse curved waves, each of which is an arc of a circle centered at a point lying on the path at a distance twice that of the arc to the wake source. This pattern is independent of the speed and size of the wake source over a significant range of values
https://en.wikipedia.org/wiki/Wake
That one makes my brain hurt!
A quick glance, does not appear to be 39 degrees inside angle?
Perhaps some intrepid investigator will put a protracter to it?
Guess I've got a major problem... My GPS wasn't working while I was storing some guns and ammo and was depending on lining up the boat wake with one of the pylons of the Chesapeake Bay Bridge when it came time to get them for the quarterly exercise and cleaning...
That’s why I was never good at water skiing!!
Yikes! Thought that that was going to be a joke for the ages, until disappointment set in when I read the last two words...
Ive watched a lot of nice afts.
No wonder I can't get any post holes dug.
At least they are being useless and not destructive as in the case of the climate scientists.
I looked it up too. I didn’t follow the explanation, but the angle seems to be independent of the vessel, its speed, and just about everything but the depth of the water and any incidental wave action.
and discovered that he didnt know how a greenhouse works
Many important discoveries are unexpected results.
I’m sure Mr Musk is on this one looking for ways to improve his cars!
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