Like it Herb? and that’s just my finless board.guys trip out on my 5’8" twin fin i ride
Do you think it’s better to stop the channel at the port or run it all the way out the back?
most here are thinking "air" induction..................WRONG !!!!!!!
it's water induction.
and as far as running it out to the tail??????????
the steeper the angle and increasing the taper of the hole.......... the better the vacuum.
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i can see it now,all these induction boards in the water..............lol.
herb
yes jbs,
keep building them.
herb
[quote="$1"]
Well everybody check out http://wavejet.com/ It's already been patented and trademarked.It's going to be for short boards, long boards, SUP's and even scuba diving. It's slated to to go into production and will be available some time in 2012. Looks like the closest thing to Pablo's propulsion system that I've seen so far, but not that fast. It will be an assist to paddling helping to propel you 3 to 4 times faster than you can under human power alone. What do you think?
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it's not the same chik,
it's motorized w/ fins.
and a hollow shorty(7 footer) wt.s in at 35lbs. ,,,,,,,,,,,grossly over wt.
plus,,,,,,,Q: what happens when you're out to sea and your hollow motor board springs a leak?
A: your float just became an anchor and will drown you!
herb
Who needs motors, just somehing else to take away from the pure experince of wave riding.or people just being lazy, so you don’t have to work as hard. surfing is not supposed to be easy you have to earn what you get.
Good point Herb. But I still think it’s kinda cool for a long board.
mitch,
i'd like it for board fishing myself !
i talked to the wave jet people at the us open this past season and they are trying to get it passed/approved by the coast guard .(so you don't have to register it as a watercraft,,,no cf #s).
i told them it's not the coast guard you have to worry about ..............it's maritime you got to worry about.
maritime sets the laws in the water/at sea.
herb
Ya that would be cool for board fishing. Or maybe getting out around Point Mugu (Pelicans point) if you don’t have a boat.
I like the idea and would like to try and shape one. It seems to me this idea would work great for a Mini Simmons type board with that big center concave. Pumping air into that concave could be interesting.
I do have one question. All of the holes I see drilled in the boards are round. Do the openings have to be round? Could the holes be a square or rectangle and still pull air. I’m not hip enough on the Venturi Effect to know if the shape of the hole matters.
Thanks
[quote="$1"]
I like the idea and would like to try and shape one. It seems to me this idea would work great for a Mini Simmons type board with that big center concave. Pumping air into that concave could be interesting.
I do have one question. All of the holes I see drilled in the boards are round. Do the openings have to be round? Could the holes be a square or rectangle and still pull air. I'm not hip enough on the Venturi Effect to know if the shape of the hole matters.
Thanks
[/quote] .....Square pieces of air do not flow very smoothly through a concave....IMO the best shape would be round inlet , with a flaired outlet....like Loui Armstrongs trumpet.......
Not as good as Herbs but I tried a few.
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fresh calimari ?
OK, so we’re not talking about air induction here…
Given the laws of conservation of energy and friction, I don’t see what you’re gaining by channeling / ducting water alone. Sure you can induce pressure / suction in given areas by changing the path of the water, but I don’t see the value. You are not going to get something for nothing; there is no such thing as a perpetual motion machine.
Perhaps someone would care to enlighten me.?
Good question, from my limited and humble understanding both (fins and ports) are trying to redirect water to create lift and control at the same time, but how much drag is produced with a fin vs the inducted port is the interesting question.
The earlier posts were stating the ports seem to only engage fully when the pressure is put on the rail/tail in the area of the ports, increasing the hold the more you lean/push. I can imagine a fin would have more form and tip drag by being in the flow of the water at all times, compared to some turbulence created by the hole in the surface while its not fully engaged or redirecting much water (causing an eddy flow? not sure of the hydro terminology).
I mean, if you’ve ever taken all the fins off one of your normal boards and taken it for a surf (and luckily managed to go in a straight line once or twice, bloody hell it was hard), you’ll notice how much extra drag the fins create. It was so much faster when I tried it. If you get some of that effect when trimming and not cranking as much water through the ports, I’m sure it’ll be faster in a lot of ways.
Boards don't work without drag.....I like fins.
TRY one out. You just might like them.
“Sure you can induce pressure / suction in given areas by changing the path of the water, but I don’t see the value.”
But isn’t that the sine qua non of all watercraft?
Sounds like a necessary thing to do, however you get it done…
Well back on the topic of air suction instead of water re-direction… If I want to make a round hole in my board to utilize the Venturi effect then there must be an optimum diameter for that hole based on the board speed right? If you figure a surfer travels in the 15 to 35MPH range then there must be a “diameter size/performance curve” where the suction performance based on hole diameter can been measured. At some point the hole is to small at that flow rate to be effective and at some point it must get to big, right? So I’m wondering if anyone has gone that far into determining the optimum diameter hole for the flow rate of a moving surfboard?
Surfers change direction so much, that slanted induction ports become drag features- Every time you slow down, the water piles up against the intakes- If you went one direction, left or right, down the line all the time, like a drag boat, windsurfer etc, and not changing any direction in regards to water flow in , than maybe they could be some help–Putting wetted surfaces in the bottom of a surfboard, that create drag anytime you turn, stall, or are at not the right speed to “Induce” (vacumn) air into the slots, are huge drag creators–In shaping early deep concaves, I could notice the paddling difference immediately, until I took off, and got some air in the concave–When I went into a hard turn, once again, the drag factors were noticeable–Way too much surface area that was not planing–Reynold’s effect with surface area, actual planing speeds, and length of time necessary to get the air under the board, before changing direction, and dumping all of that speed needs to be considered, as well as the drag that the induction slots put into contrasting water flow directions–Hope everyone is having fun playing with their creations–That is what it all about–FUN—