Catamaran conversion

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Catamaran conversion

Postby almceachran » September 26th, 2010, 5:26 pm

I am considering converting my A-class catamaran to a rower. It is 18' long, 7'6" beam and weighs 120lbs. The oarlock would likely have to sit 14" above the waterline for the oars to clear the hulls. I would appreciate advice on issues with the increased angle of the oar, also advice on type of oar. I would likely use a drop in slider.
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Re: Catamaran conversion

Postby jamesg » September 28th, 2010, 3:33 am

Maybe your best if not only bet would be to convert to a 2x / 2-, reducing the beam to the span (or a little more) of a training shell. Then you can use two decent pairs of real sculls (or sweep oars) at a reasonable speed, adjusting the gearing to what actually happens, but won't need rudders (maybe just one small one), keels or a cox that all increase drag.

My guess is the sails on a Class A generate about 10kW in a stiff breeze; so you can't expect to go fast with just your 200 (?) W.

Of course all the tough problems remain: space, getting the thing in and out of the water, sculling into a headwind, transport. Maybe you could leave a jury rig on her with at least a jib for sailing into heavy weather. Downwind she'll go anyway.

On the A Class US site, I saw boats advertised at 5-6k$; so you could do a lot worse than sell her and get a couple of K1s or a K2 or even a 1x trainer. At least in a K you see where you're going and they only need a patch of mud to float on.
77y, 188cm, 85kg, MHR 170. 3km/h in water, 10km/h on. Last 2k (1-16) 8.10@26
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Re: Catamaran conversion

Postby almceachran » October 7th, 2010, 8:54 pm

Thanks James,
I have located a spare set of crossbeams and will likely shorten these to give me a beam of around 160cm. I am reluctant to sell the boat and would probably switch back and forth. I am on the ocean so storage, transport is not an issue and the catamaran configuration will handle rough water. I would love a shell but typical conditions are pretty rough.
I don't think a rudder will be required, under sail the boat tacks on a dime. Also windage is relatively low, although not like a shell.
Regarding the power of a Class A I have never calculated it, but she will lift a hull in 7 knots of wind, from that point on it is hiking out and bending the mast to de-power the rig. At 20 knots it is just to much for one person to handle.
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Re: Catamaran conversion

Postby pmacaula » October 8th, 2010, 8:35 am

Suggest you try sending a message to Steve Clark, who has an ID on Sailing Anarchy. He is an A Class (and C Class and ...) sailor/builder and sometimes sculler. If anyone could give good advice on such a conversion, it would be him.

You can find lots of posts by him in the Multihull Anarchy forum, notably the thread 'Fred is in SO much trouble'.

Cheers. Patrick.
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Re: Catamaran conversion

Postby Byron Drachman » October 9th, 2010, 2:09 pm

You probably already have seen this, but just in case:

http://www.rocat.co.uk/
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Re: Catamaran conversion

Postby Bob S. » October 9th, 2010, 4:10 pm

Byron Drachman wrote:You probably already have seen this, but just in case:

http://www.rocat.co.uk/


Thanks for sending that Byron. I had never heard of it before. Damn shame that it was unsuccessful financially. (I wonder if FISA helped to scuttle it - like they did the moveable rigger.)

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Re: Catamaran conversion

Postby almceachran » October 15th, 2010, 7:03 am

Byron - Yes it was the Rocat that got me thinking.

Patrick, Thanks for the lead on Steve Clarke - I will check it out.
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Re: Catamaran conversion

Postby afriedma » January 17th, 2017, 12:54 am

Here's a photo of another rowing catamaran, an Aqua Cat: http://www.adirondackrowing.com/Aqua%20Cat.jpg

I should think that this photo would give you good ideas on width between hulls, mounting a sliding seat, and installing riggers/oarlocks. If you set it up so that there is a standard sculling distance (spread) between oarlock pins (typically 156-162cm, or about 5' 3"), you ought to be good. If you got a drop-in rigger setup, then you wouldn't even have to worry about how to mount the oarlocks to the hulls. An Alden Oarmaster or a Row-Wing might be the way to go. I just bought a used Oarmaster I from Adirondack Rowing : http://www.adirondackrowing.com/used%20boats.htm

A guy near me is selling his Tomcat Skimmer rowing catamaran, which uses a Row-Wing drop-in rigger: http://seattle.craigslist.org/see/boa/5959688489.html
The spread on that boat is much greater than the width between the hulls. Apparently the company, skimmerboat.com, is still in business
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