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Old 03-17-2011   #1
Park City, Utah
Paddling Since: 2001
Join Date: Nov 2003
Posts: 227
Cat Frame Depth?

I just bought some Aire Leopard tubes (18' long 26.5" diameter), that have d-rings 13" from the top of the tube. I read that you should take the depth, minus the d-ring radius (2") minus another 1/2" for slop. That would put the bottom of my frame 10.5" from the top of my tube. Does that sound right? Would it be alright to make it any deeper? They are big tubes, and I probably won't put the tubes that deep into the water.

I was wondering what kind of depth other people's cat frames are, and what type of tubes that you have (diameter and d-ring depth).

Thanks for any info.

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Old 03-17-2011   #2
Denver, Colorado
Paddling Since: 1974
Join Date: Jan 2010
Posts: 140
My AAA frame drops 12"

I have 16" Hyside tubes but I dont' remember the diameter as the tubes are put away for the winter and folded up.

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Old 03-17-2011   #3
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Up North, Oregon
Paddling Since: 1985
Join Date: Jul 2008
Posts: 1,150
Its a bitch if you make it too deep and use a floor and your shit is in the water. It is way better to air on the shallow rather than deeper side of things.
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Old 03-17-2011   #4
over the horizon
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Carbondale, Colorado
Paddling Since: 2003
Join Date: May 2009
Posts: 267
Yeah, 10 1/2 sounds right for 26" tubes. It seems like a terribly small amount, and that it would cut down on cargo capacity and passenger space. Consider however that cargo capacity is limited by how much load it takes before your floor is riding in the water. Less than that, even: a floor two inches out of the water grabs waves like mad in anything over class II. So to start with the floor farther from the water is to maintain cat performance under the loads it will surely take on.

I have 25" tubes, my frame drops 9.5", and I typically enjoy 5" of clearance when loaded down.
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Old 03-17-2011   #5
Join Date: Apr 2006
Posts: 166
I would allow more than 1/2 inch above the top of the D; should be an inch at least.
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Old 03-17-2011   #6
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vancouver, Washington
Paddling Since: 1996
Join Date: Apr 2009
Posts: 1,146
I've got lions 27.5 and NRS yokes. Works ok. Maybe about 4" when loadedReally ruins your day if your drybox hisides on a rock. Something you really don't think about in a raft
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Old 03-21-2011   #7
Engineer Civil Structural Hydraulic, Evans CO
Paddling Since: 68
Join Date: Jan 2007
Posts: 158
I find 9.25" centerline depth to be optimum such that the rocket boxes are evenly supported on the bottoms and handles. This generally works with big and small tubes; some double tube Aires being the exception.

Gary Strome
Friends Don't Let Friends Drive PVC Boats
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