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PostPosted: Thu Apr 06, 2006 11:02 am 
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Site Rank - Deck Hand

Joined: Thu Apr 06, 2006 7:51 am
Posts: 14
Location: Roswell, Ga
I have had my Adventure since November. At first the humps and bumps in the hull did not concern me until I noticed that my Classic is one third faster than the Adventure. I noticed that when I put my boat in cold water (56 deg) the deformities became much worse and the boat would not paddle in a straight line. My local dealer says he will get me another boat or try a hot water/air pressure fix. I noticed in these posts a gentleman who did a comparison between the various hull shapes. In his pictures his boat was showing a lot of humps and bumps.

IS ANYONE OUT THERE HAVING SIMILAR PROBLEMS? I have had no problems with my classic.


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PostPosted: Thu Apr 06, 2006 3:17 pm 
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Joined: Fri Mar 17, 2006 10:59 pm
Posts: 132
Location: Moreno Valley, CA
I haven’t had that problem with my Adventure. Mine was a last years model before the new hatches.

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 Post subject: Hull Deformities
PostPosted: Wed Apr 12, 2006 6:38 am 
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Joined: Thu Apr 06, 2006 7:51 am
Posts: 14
Location: Roswell, Ga
Follow up: My dealer, The Outside World, Dawsonville, GA, is giving me a replacement boat. Another reason to buy from your local dealer. Thanks Brent Troncalli


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PostPosted: Sun Apr 16, 2006 9:53 am 
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Joined: Fri Jan 13, 2006 9:02 pm
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Did your hull look like this?

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 Post subject: lumps
PostPosted: Sun Apr 16, 2006 10:06 am 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 9025
Location: Oceanside, California
That is a pretty typical lump in the mirage kayaks. The thicker area of the well does not shrink as the skin does when cooling. All rotomolded product does this to some extent.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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PostPosted: Sun Apr 16, 2006 10:08 pm 
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Joined: Sun Oct 16, 2005 10:39 pm
Posts: 84
Location: San Diego, CA
My Adventure has that same lump.


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 Post subject:
PostPosted: Mon Apr 17, 2006 5:38 am 
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Joined: Tue Apr 11, 2006 1:49 am
Posts: 176
So does my Outback. Seems like it'd be pretty typical for the dynamics that must be going on when that's being formed and cooling.

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Portsmouth, VA


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 Post subject: hull deforities
PostPosted: Mon Apr 17, 2006 7:46 am 
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Joined: Thu Apr 06, 2006 7:51 am
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Location: Roswell, Ga
My hull had multiple humps around the centerboard and all the thru hull holes. It was like paddling a ladder across the top of the water. The new hull they gave me is not perfect. It is better, but not perfect. My mirage classic is perfect. Why can't these be. Spoke to a gentleman at the boat ramp on Lake Lanier yesterday. His adventure has a big deformity just in front of the centerboard. Has anyone noticed how flexible these boats are when hot? I'll figure out how to post a picture of the replaced boat tonight.


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 Post subject: Deformations
PostPosted: Mon Apr 17, 2006 3:49 pm 
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Location: Oceanside, California
The more features built into the hulls the harder they are to mold. The Classic Mirage was a VERY simple design compared to the adventure. There are all kinds of pockets, scuppers, drive well, dagger well. All of these are issues when pulling a boat out of the mold. When cooling too. Different colors of materials, different temperatures of the day or night when it is molded. The thickness of the materials can change the amount of distortions and the thicknesses can vary. Pretty complex.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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 Post subject: HULL DEFORMITIES
PostPosted: Tue Apr 18, 2006 9:36 am 
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Joined: Thu Apr 06, 2006 7:51 am
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Location: Roswell, Ga
I can accept the fact that it is a difficult mould. As a redneck engineer Hobie is telling me that they need to use a different material if they can't turn out a reliably perfect product or design the product for the material. The material my adventure is made out of is very temperature sensative. In Georgia on a 90 deg day (in shade) boat is very flexible then we throw it in 56 deg river water it goes the other way. It will be interesting to see what my boat looks like in a couple of years.


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 Post subject: Materials
PostPosted: Tue Apr 18, 2006 1:30 pm 
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Joined: Tue May 27, 2003 12:44 pm
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Location: Oceanside, California
There is no better material to use in these products at this time.

These materials are pretty much industry standard and used on all kinds of products for many, many years. We have been rotomolding boats here at Hobie since 1994 and continually strive for better results. We are getting more and more features built into our boats which pushes the envelope. We will continue to refine and improve I am sure. That is what we do here at Hobie.

What we do know is that we have, and all of the kayak manufacturers have, product all over the World in all kinds of conditions. The materials may get softer when hot, but cool and have "memory" for their molded shapes. These are cooked in ovens at over 600 degrees where the inside of the molds reach over 350. Certainly the darker colors will be effected the most and people in very hot climates may prefer the lighter colors or even white. We have done tests with direct sun and covered in plastic where hulls reached 150-160 degrees. Yes, that is hot and can cause deformations when pressed against. These boats always popped back to their original shapes.

Once again, we seem to be leading the industry here and will forge ahead with inovations and that will likely include materials.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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 Post subject:
PostPosted: Tue Apr 18, 2006 10:56 pm 
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Joined: Wed Dec 07, 2005 11:04 pm
Posts: 615
Location: Hawaii, Big Island
So your going nanotubes? Maybe cut the weight down?

Carbon nanotubes have already been used as composite fibers in polymers and concrete to improve the mechanical, thermal and electrical properties of the bulk product. Researchers have also found that adding them to polyethylene increases the polymer's elastic modulus by 30%.

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 Post subject: Fibers
PostPosted: Wed Apr 19, 2006 10:04 am 
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Location: Oceanside, California
Always seemed to make sense to me, but this has not been proven out in production yet. Seems like a good direction to be going though.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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 Post subject:
PostPosted: Wed Apr 19, 2006 12:26 pm 
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Joined: Wed Jun 01, 2005 7:32 pm
Posts: 235
Location: Out There
Carbon fiber is wonderful stuff, but the plain old unidirectional fibers and woven cloth we use to make some of our stuff(which is a lot smaller than a kayak) is pretty costly. I'll bet a few of those nanotubes are going to significantly raise the price of anything they are in.
Of course carbon fiber masts and spars have been part of the sailing world for years, so I'm sure the engineers at Hobie have piles of it laying around to play with.
Embedding carbon fiber in a polyethylene kayak hull would be interesting. The polymer would shield the fibers from galvanic situations and take the notch sensitivity weakness of carbon out of the picture.

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