Cat Frame ? - Mountain Buzz
 



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Old 05-07-2012   #1
 
Lemooreq, California
Paddling Since: 1969
Join Date: Apr 2012
Posts: 60
Cat Frame ?

I'm going to build a frame for 14' x 22" tubes. Fishing and water up to Class III+. Pretty sure I'm going with aluminium for weight and corrosion resistance, so I hope you guys can help with a couple questions on frame size:
  1. Appears to be 2 sizes of pipe most common; 1-1/2 (o.d.) per NRS and 1-7/8 (1.90) as per Rowframe. Pro or con of each?
  2. Regarding the above sizes, what wall thickness of pipe? I'm thinking it's .125 (1/8"). Can anyone confirm?
Thanks

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Old 05-07-2012   #2
 
Searching for water....., Idaho
Join Date: Apr 2012
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NRS Pipe

NRS material is 1 5/8" O.D. with 1/8" walls.

NRS Unbendable Pipe 1-5/8" Anodized at NRSweb.com
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Old 05-07-2012   #3
 
Join Date: Apr 2006
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Go with 1.5 nominal [1.9 OD]. Make sure you get schedule 40 6063 aluminum if you want to bend it. 6061 is fine for straight runs. If you go with NRS pipe, plan on using their fittings and drops, etc... If your building everything, their is more versatility with the larger pipe, particularly if your going to bend/swage it.
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Old 05-07-2012   #4
 
Lemooreq, California
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NRS Pipe

NRS link says sch.40, but 1/8" wall. That translates to .125 which is NOT sch. 40. Wall .125 6061 aluminum tube weighs .520 lbs/ft. NRS also says .786 lbs./foot which IS sch. 40. Big difference in weight. I'm not bending it, but using fittings, which are available in either size.
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Old 05-07-2012   #5
 
East of the Pine beatle, Colorado
Join Date: Jan 2012
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Quote:
Originally Posted by pvsprme View Post
I'm going to build a frame for 14' x 22" tubes. Fishing and water up to Class III+. Pretty sure I'm going with aluminium for weight and corrosion resistance, so I hope you guys can help with a couple questions on frame size:
  1. Appears to be 2 sizes of pipe most common; 1-1/2 (o.d.) per NRS and 1-7/8 (1.90) as per Rowframe. Pro or con of each?
  2. Regarding the above sizes, what wall thickness of pipe? I'm thinking it's .125 (1/8"). Can anyone confirm?
Thanks
I just had a frame like you describe built at DRE in Denver. I chose 1 1/2" OD to save weight- They had fittings for everything we needed for that diameter- and the way it turned out, it's completely bomber. I cannot imagine needing any more strength or rigidity for the application you and I have in mind. I may occasionally take on class IV- and I have zero doubt that this frame can handle it. My tubes are 13'x20" Lemme know if you need pics, ideas, etc.
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Old 05-07-2012   #6
 
The Big Smoke, Washington
Join Date: Feb 2012
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Guide to Buying Aluminum Online | Online Metals Guide to Selecting Metals for Your Project

That link will tell you the strength differences between 6061 and 6063 as well.
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Old 05-07-2012   #7
 
Join Date: Apr 2006
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If your are not bending, and weight is a big factor, then go with 1.25 nominal pipe with 6061 T6 pipe. There are variations in wall thickness and differences between pipe and tube. 6063 is more malleable, but with time ages into a harder alloy. At least that is what I have heard.
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Old 05-07-2012   #8
 
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Fresno, California
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NRS calls it "tube" but they use 11/4 inch schedule 40 pipe, in T6061 for straight and T6063 for the bent sections.
Their "Lo-pro" fittings fit standard sch 40 pipe, as do Holleander fittings. Another possibility (since you're building a fishing boat) is double rail fittings like these https://www.mountainbuzz.com/attachme...8_original.jpg
which can be used to mount a flat surface to walk on.
I got those a couple of years ago from a fellow "buzzard" named Zorba The Greek. I have a few extras, if you're interested.
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Old 05-07-2012   #9
 
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Fresno, California
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BTW, since you're in the area, we're running the Kings (above Pine Flat) on the 19th and 20th. Wanna join us?
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Old 05-08-2012   #10
 
Lemooreq, California
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Justkip,
Email sent.
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