The New MALIBU KAYAKS X-Wing Slider

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FishByte
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Very cruel

Post by FishByte »

Jim,

You are a very cruel man to post fish porn like that.
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Coastal Country
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Post by Coastal Country »

Hey your from Texas, i bet the fishing is great out there BTB but bubba you gotta be having withdrawls! Drop by anytime! :wink: :D :D :D
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Mrs Backlasher
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Post by Mrs Backlasher »

So cool!

I've often wondered if I could have a yak with a dash!

Mrs. B
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Post by reagan1k »

Could one be made with a base that screwed into a flat section or hatch area on another style kayak that does not have rails.

I have a Malibu 2 XL with an unused hatch spot (small) and if there was a base that could be attached to that area and this console could be attached to that it would be awesome..
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Post by F.O.C. »

Mrs Backlasher wrote:So cool!

I've often wondered if I could have a yak with a dash!

Mrs. B

...if its got a smooth finish, I might be able to add woodgrain to it. :wink:
Jim Day
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Post by Jim Day »

KjcTheGhost wrote:SWEET RIG JIM!!!!


Thanks!!!

It's been good to me. FND's are slow but they are a good stable platform.

If you like that one here's my other yak.

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That one I designed and built myself.

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It's faster then the FND so I fish it when I want some range.


The thing about fishing Kayaks is they are all good :D


Jim
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Night Wing
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Post by Night Wing »

Jim Day,

Nice looking wooden SINK. I'm just curious. I've got a wooden sea kayak. An Outer Island. It's the one in my avatar. What is the length and width of your wooden yak?

BTW; loved the picture of the halibut you caught. :D
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Post by SafetyHooker »

SWEET ! one pretty Sink !
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Post by Jim Day »

Night Wing wrote:Jim Day,

Nice looking wooden SINK. I'm just curious. I've got a wooden sea kayak. An Outer Island. It's the one in my avatar. What is the length and width of your wooden yak?

BTW; loved the picture of the halibut you caught. :D



Thanks!!!


The length is 18 feet the width 29 inches.

I kind of invented my own non-standard hull.

I'd never kayaked before when I built it but I know some things about boat design, and I had played around with wood dories. I used to own a wood Atkins canoe yawl and for a while (decades ago) I was really into wood sailboat design.

With the yak biggest my fear was tipping over so when I designed the hull I made it lower (with more rocker) and wider in the center (with more flare) then a standard yak. The idea was to get my butt as low as possible in the water to act like a ballast or a weighted keel in a sailboat, and have as much reserve stability in the hull as possible.

Image

Rocker is the rise from the lowest point in the center to the lowest point at each end. As you can see my boats got a lot of it something like five inches. This means my weight (my butt is way lower then the majority of displacement. To increase that fact I sit on a foam pad that's one 1/2 and inch thick which puts my @$$ pretty low in the scheme of things. That increases initial stability.

Here's the shape of my hull in cross section versus a normal wood hull:

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Though the two hulls at the bottom are probably the same width mine flares out more getting wider as it goes up. The deal here is I wanted a fairly normal footprint but I wanted the reserve stability that you get from a wider hull if the yak started to tip.

This is how a dory works. The hull is narrow at the base so it's tender but won't tip over because as it leans over it gets a wider water line, which increases it's effective displacement.

Essentially the more weight you put in it, the better the ratio of waterline (displacement) to weight (mass) location and the more stable it gets.

In this picture you can kind of see the flare as well as the sharpness of the stern.

Image


Now too get away with all this I made the front and rear of the yak extremely narrow. Most plastic yaks that are wide are blunt like my FnD and that makes for a slow boat.

The idea behind my yaks shape was a sharp entry and exit would allow me to cut through the water and reduce some of the drag of the wide deep center.

You can kind of see how I bent the wood inward at each end. In boat construction this is called warping the planes.

If you think about it the most energy efficient surface to slide through the water is a flat straight one, like a paddle board, Your hull probably uses the wood in a flat way. The only bend in it comes long ways but the individual planes of the hull are essentually flat like a bent board. In contrast I twisted the "planks" or planes in my hull to make a cleaner opening and exit. At low speeds this works great but as I go faster the warp in the hull planes causes the water to warp or twist as well. That's why my yak is probably not as fast as yours, because the faster I go the more energy is lost to twisting the water around my deeper wider hull.

The flatter the hull the less energy is lost to twisting water.

But..... everything's a trade off. That energy loss is not really a big deal until the hull is moving very fast by yak standards, something like five knots so I do a lot of paddling a 4.5 knots.

Now here's the most important part of my design and honestly I had no idea it was going to work this way. Due to my narrow bow and stern and the fact that the majority of displacement is in the center, my kayak cuts through the sea like a sailboat instead of riding over it.

I was just trying to reduce drag and get the most stability I could, but the actual result is more pronounced then I could of imagined.

A flat bottom yak performs very well in flat seas but as soon is you get in any kind of waves it's performance goes way down. That's because the high displacement bow and stern bounce up and down in the waves.

Paddling is all about inertia. The boats mass keeps it moving between paddle strokes. When you hit a wave in a standard yak it bounces up and you loose all your inertia. So in any kind of seas a standard kayak slows way down, and is more work to paddle.

In contrast my yak cuts through seas with almost no up or down motion in the bow or stern.

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Your bow probably has double the displacement of mine so mine knifes through waves that yours floats over.

Since it doesn't bounce up and down almost none of the inertia is lost to non foreword motion, so it's almost as fast in seas as it is on flat water.

In hind site it makes perfect sense. Sailboats are all about using inertia to cut through seas with minimal drag. Put a sailboat hull on a kayak and it acts like a sailboat...DUH!


My next Yak will be a SOT, flat bottomed like a paddle board, foam and carbon fiber, and the goal is flat water speed and a kayak that surfs just like a board...LOL


Well so much for my lunch break... Back to work.

Thanks for the positive comments :D :D


Jim
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Post by Night Wing »

Jim Day,

I thought your SINK might have been 20' in length, but it's the same length as mine, 18'. Mine isn't built for fishing. I use it for paddling exercise and she's very fast since she's only 21" wide.
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