Building a cat boat from a jon or other row boat

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Crazyboat
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Joined: 17 Aug 2016, 20:52
Location: NJ

Building a cat boat from a jon or other row boat

Post by Crazyboat » 18 Aug 2016, 19:51

At first I thought my idea mentioned above was "crazy"boat, hence the name. Then I did a search here and found I wasn't alone.

I always wanted to add some old water skis onto the bottom of a 12' row boat, one on each side along the bottom and 2 almost together near the bow towed in just a bit.

I figured the bow skis would be out of the water when up on plane for the most part but there in case of a heavier load.

Add 1 long shaft outboard between 10-20 hp and you should be flying along.

Then I read here we're guys weld on sponsons much like a regular catamaran, the only thing I'd like to do differently would to not have the sponsons flat bottomed but more like a race hull where they are always angled towards the outside of the boat.

Thoughts, ideas, suggestions? If anyone that has done something like this cares to comment on it being possible or impossible I'd love to hear from you.

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lckstckn2smknbrls
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Building a cat boat from a jon or other row boat

Post by lckstckn2smknbrls » 18 Aug 2016, 20:20

I don't understand what your trying to do.
Do you mean a hydrofoil?
1971 14' Ward's Sea King Jon Boat / 1983 Mariner 25HP

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Johnny
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Building a cat boat from a jon or other row boat

Post by Johnny » 19 Aug 2016, 09:21

Never heard the term "cat boat" before . . . (catamaran) ??
but from your description, hydrofoil comes to mind.
sure, it can be done !! just depends on your tools at hand,
enthusiasm, engineering skills, and DEEP POCKETS.
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Crazyboat
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Joined: 17 Aug 2016, 20:52
Location: NJ

Building a cat boat from a jon or other row boat

Post by Crazyboat » 19 Aug 2016, 19:27

Sorry guys, no just measure 5" including ski depth and mount water skis to boat bottom.

Or add 5" deep sponsons or catamaran type extensions off the existing hull to give lift and gain speed.

Hope that better describes it.

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richg99
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Building a cat boat from a jon or other row boat

Post by richg99 » 19 Aug 2016, 23:54

I'm just an old fuddy duddy, but boats have been built for thousands of years. All sorts of modifications have been done. Some have been very successful.

By now, most iterations have been tried and either succeeded or failed.

It seems to me that what you are attempting is kind of out of the realm of "normal". I'm all for trying something different, but I suspect that you are going to need lots of money and lots of time.

Go for it. I doubt if any of our guys can help a whole lot. richg99

CedarRiverScooter
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Building a cat boat from a jon or other row boat

Post by CedarRiverScooter » 20 Aug 2016, 09:02

You might want to follow a proven design. If it is unstable at speed, you could get hurt when it flips. I would have no idea how to calculate the angles & loads.

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fishmonger
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Building a cat boat from a jon or other row boat

Post by fishmonger » 20 Aug 2016, 10:00

This is a cat boat in the sailing world (not to be confused with a catamaran) . A Mono hull with the mast stepped way up into the bow. Originally designed, mid 19th century, as a tough work boat to handle the rough Cape Cod waters.
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