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i have 2 cats, an 11 foot jacks and a 14 foot maravia. before the next season i plan on acquiring a 12-6 sotar legend.
my 14' maravia is 90" wide. my 11' jacks is about 68" wide.

i am wondering how wide to set up a 12' 6" cat for technical class IV and V runs. it will be a dedicated technical water boat. no cooler space, no drybox space, no second seat. just a seat, enough frame to place the feet, hang a throwbag and secure a spare oar. ok, maybe a spot to hold a water bottle.

my initial plan is to build a frame that is 65" long, that will give me the ability to move the whole frame fore and aft up to 5 inches to achieve different balance. for width, i am looking at 80" out to out of the tubes. that would give me roughly the same proportion of width to length as my bigger cat. the frame would be 57" wide, with the oar towers splayed out.
anyone care to measure their frame on a similarly sized and used boat?

frame will be 1" .065" chromoly tube. bent and welded, no fittings. and powder coated.
 

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I'd go wider- when a frame is narrow the pitching of the boat is more snappy and you can get tossed easier. If the rivers you're planning to run will accomodate more width, take advantage of that. You'll have a more stable ride that is less likely to toss you into the drink.

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I like 36" between tubes for many reasons. The river may turn your boat faster but so can you. I have heard people say 38 for these reasons: coolers boxes lighter weight oar geometry and maybe some extra stability. 36 is lighter, faster, and you can do some cool things with your seat bars and gear storage. Pm me for details...

I'm at 36" between tubes and I believe im about 64" on the frame width
 

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I'm with rafterman. 64 up top 36 inside and 62 front to back for a 14' wave destroyer or similar boat. Gives you a foot bay drop bag under seat and rear cargo bay. You can add modules later. I am building a frame to those specs as we speak. It will be up for sale this weekend.
 

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I was actually wondering the same thing, so this year at the Lochsaw festival and a few others I went around measuring dedicated white water frames. 7 out of every ten rigs were 66" center to center. The others were anywhere from 60" to 68". It was the deciding factor for me going to an NRS 66" yoke frame. Hope that helps
 

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36" between tubes is great, and I have found I like 34" with a drop seat even more.

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