foam holding water

Hi new to Hobie. just got an old hobie mono 11'9" boats a bit heavy. Read someplace that they had problems with foam holding water. any post on what to do to fix this. I think this boat looks like fun. if I can get it in the water

This has been discussed a few times. Mostly it is very difficult to dry this out. Impossible to open and remove as the foam is structural.

Try a search for monocat foam.
http://www.hobiecat.com/forums/viewtopic.php?f=9&t=37786&p=167184&hilit=Monocat+foam#p167184

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Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)

thanks for the help

Has anyone tried sticking it in the attic for a year or two? It seems the heat will help dry it out over time, then just be sure it stays stored in a dry location when not in use.

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Steve
1979 Hobie 16 "Orange Crusher"
2017 Hobie 16 "Cayman" sails 114795

I had a monocat as well that ended up in the dump. Another big problem with this is that the aluminum has likely corroded down to almost nothing because of is sitting in the soaked foam. There is just about nothing you can do to dry it, and even if you could, the boat just does not have that great of a design to keep the water from getting in again.

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2010 AHPC C2 #218

I hate to join the naysayers, but I had a Monocat that I let sit at 30 degrees bow up in the sun for two summers to try to dry it out. It was still so heavy after that it took three people to lift it and it sailed with only an inch or so above the water on the side you sit on.
When I wrecked it, I cut it apart and found that like everybody had said, it was just waterlogged to the max. 1 foot cubes of the foam I pulled out would weigh upwards of 30lbs.
Its really sad because the boat was a fun little one for short sails.

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'01 Getaway
'74 Monocat (in memory anyway)

So if someone finds one for sale locally in good shape, what SHOULD it weigh?

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Steve
1979 Hobie 16 "Orange Crusher"
2017 Hobie 16 "Cayman" sails 114795

You should be able to pick up the hull by yourself, somewhere around 150 lbs. The water logged ones weigh more like 3-400 lbs.

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2010 AHPC C2 #218

Sunfish are notorious for getting waterlogged. They can be dried out. Do a Google search on drying out a Sunfish and you will find a lot of good info.

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'88 Nationals Blue
Hobie Alter Signature Model
Sail #11

Hobie Mirage Classic

A Sunfish and a Hobie Monocat have vastly different construction methods and materials.

A Sunfish fiberglass, with foam flotation blocks (much like the fiberglass models of Hobie Cats) and is mostly open space on the inside, which allows airflow to gradually dry the flotation foam (once ports are installed).

A Monocat is essentially a foam hull covered with a thin ABS plastic skin. The foam is not only for flotation - it's structural. There is no way to get airflow in/out the hull to allow the foam to dry.

This thread has the dissection photos that show how the hull was constructed: viewtopic.php?f=9&t=37786

Unfortunately, this model (and the Hobie 12 monohull) were doomed from the beginning by this construction method - and precipitated their early demise.