Bjorn Dunkerbeck was working on a chop reduction system. I think it's a line of floating buoys. It could be a little easier than building a bank. Maybe all of us could chip in at our local spot?

http://www.boardseekermag.com/special_features/bjorn_interview/bjorn_dunkerbeck_interview.htm

"I have been working on the chop reduction system for quite a while. I have been working with Red Bull to produce a 750 metre long system that I will be using at Port St Louis this autumn. I can transport it to any where else in the world as well. One of the aims is to be able to maximise the number of places in the world for speed sailing. Once it works the way I want it to work, I am convinced it is best because it can be changed to the wind direction. The angle can easily be changed to from 125 to 135 degress off the wind which is the ultimate broadreach angle."

Could benifit everyone who wants to go fast. surely if we all have a good think about it we may come up with some good ideas,or improve the ideas that already exist. Yes I am looking at crab country.shallow an easy access. out of the way of boaters.5000 sandbags for an 850m wall. That is a guess

For the mandurah mile we just need someone to donate an old excavator to dig and pile our own sandbar custom shaped and angled for the speed run and maybe to do away with those limestone outcrops in the middle of the strip as well

Bjorn's chop killer - about 2004

What about opening a can of HTFU


Kinda ironic after I crapped my pants last weekend with the conditions

I've given this some thought as well.

What about a big long plastic tube, half filled with water (the other half filled with air), anchored at points along its length.

The water would give it mass, the air would keep it floating, and you could just open one end and roll it up from the other for storage. I'm sure that someone in industry can source some sheet tube...

Only problem I can see is that the air might all run to one end so parts of the tube might bow upwards... maybe more anchoring points might be needed.

Following on from YoYo, the major hurdle will be getting approval for such a thing.

Given Peel Inlet is the ideal location and it's big enough and shallow enough, we have to start building relationships with the relevant authorities.

There was talk of starting up a Mandurah Windsurfing Club (MWC), and Council reps said that council would provide and invest in facilities for clubs, maybe we need to seriously think of becoming a club??

Re MWC: Local discussions have come up with 2 major issues, lack of motivation which can be easily overcome, but the 2nd point of the inevitable power struggles that happen in clubs, which could ruin some great friendships that have grown out of the informality of windsurfing in Mandurah, and this I would be seriously concerned about, and what stopped me moving with it (I have all the relevant paperwork).

A light tube half filled with air will NOT achieve a good result. All it will do is allow the waves to pass under. You need to have something with a different mass and resonant frequency to the water (which is the only reason water will not work).

Waves are energy
Energy must be absorbed, it cannot be destroyed. (Energy absorbtion is the only way of flattening waves)

in a perfect world you would have a floating mass with resonant frequency 180 degrees out oif frequency to the waves. This is almost impossible because real ocean wave fields are not composed of single frequency waves.

So the next best solution is to have an floating object with a lot of damping. For this you need a floating device with large horizontal planar area (Hence the flat sheets that Bjorn uses in the picture above.
The downside of Bjorns setup is that because the floating signs have relatively little mass, they cannot absorb much energy, allowing a lot of wave to pass through the device (you can see some reasonably big waves on the leeward side of the device. If the device had large horizontal steel planes about 50cm below the surface it would be MUCH more effective. Then you only need to mange the issue of storage, transportation, deployment, cost etc. :-(

Not alot of help I know, but I thought it best to raise this issue before anyone spent any money on this proposition.

Take a look at some Wave Energy Devices, in particular Salters Duck (great conspiracy story too) for the high performance industrial stuff. Or try to emulate a swimming pool lane rope system, where the lightweight floating body translates the vertical wave motion into damped axial turning moment.

JB

Nebbs i reckon your idea would work in a shallow location like melville or hardies where the chop doesn't have the distance to build.

Hi JayBee

I hope you're not flogging "The floating pipeline across botany bay to the desal plant as being good for windsurfing" again are you?

Jethrow

secondhand shipping containers you can pick them up for around 2-3k they would stop any waves

hardie said...

There was talk of starting up a Mandurah Windsurfing Club (MWC), and Council reps said that council would provide and invest in facilities for clubs, maybe we need to seriously think of becoming a club??

Re MWC: Local discussions have come up with 2 major issues, lack of motivation which can be easily overcome, but the 2nd point of the inevitable power struggles that happen in clubs, which could ruin some great friendships that have grown out of the informality of windsurfing in Mandurah, and this I would be seriously concerned about, and what stopped me moving with it (I have all the relevant paperwork).

Mandurah poleys had a windsurfing club way back 12 years ago.
We called ourselves Avalon Wavesailors.
Actually, the term 'poley' hadn't been invented back then....
that's because kitesurfing wasn't on the radar.

The club was an informal organization.
We held our first meeting at Decrep's old shack right on the beach and the club was formed over cocktails and munchies.
It was a good vibe with probably 20 or more sailors.
I was commissioned at the time to design a graphic for the club t-shirt.
My design was deemed to be too radical and so a corporate model was chosen instead.
I never did get a t-shirt.

Now I find myself involved in the local boardriders club cause my 3 kids all ride.
It's full of politics of course but my kids dig the club because of the mateship.
I guess mates, rate.

Regards
slave.

Whiperwave looks pretty good,I wonder whether it could be modified so it did not rise so high above the water - because i think it would stir up wind turbulence.

Those wave attenuators look pretty good. Its a pity they don't harness the energy and generate power. Then someone would pay to install it for you.
There you go Nebbs, something to work on - a low profile linear modular portable wave energy electrical generating device. ooooh....