Raft gear frame size, 1.25 or 1.5??? - Mountain Buzz
 

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Old 06-28-2018   #1
 
Cody, Wyoming
Paddling Since: 82
Join Date: Aug 2009
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Raft gear frame size, 1.25 or 1.5???

I'm about to design and build a gear frame for my new raft. 14' 6" Wing with 21" diminishing tubes, 60" C to C tubes.

My current fishing frame is a 1.25" box store frame. I was going to modify it so I could use it for a gear frame and convert back as needed. However, now I want a winter project, frame and also a new trailer for the raft.

Frame, at this stage, is going to be a welded double rail with diamond plate. I'll buy dry box(es) and cooler and make the frame fit what I buy, probably a 4 bay but we will see.

From my research it appears 1.5" welded is needed on a cat and/or big water. With 1.25" you do have the ability of some interchangeability of box store parts. As this is a raft(and not a cat), and just 60" C to C, I'm thinking 1.25" will do me just fine even on roughest water. Is there an aspect of 1.5" that I don't know about that may make me go with the larger size material?

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Old 06-28-2018   #2
 
Salt Lake City, Utah
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Aluminum or Steel frame? 1" EMT was used for frames forever and I have used a 1" EMT steel frame on an Avon Pro forever without problems.

I have seen some smaller tube aluminum frames bend. Not sure what size they were though. I think it had 1.25" cross members
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Old 06-28-2018   #3
 
Cody, Wyoming
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Quote:
Originally Posted by unlucky View Post
Aluminum or Steel frame?
Yep, sorry, aluminum pipe sch 40
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Old 06-28-2018   #4
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Weld county, Colorado
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1.25 6061 is more than enough. Schedule 40 is fine.
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Old 06-30-2018   #5
 
Arnold, California
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For the boat/gear you are planning for 1.25" sch 40 is fine. Welding or not becomes a personal preference and there are advantages/disadvantages to both hitch have been discussed as nauseam in other threads.

(1) ever so slight advantage is that the 1.5" gives a small increase off the floor to put stuff in dropbags/coolers.


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Dave
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Old 06-30-2018   #6
 
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Fresno, California
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From an engineering point of view, 1.25" is plenty. A 4 bay frame has 5 cross bars, and they're only 60". Double rail sides, under diamond plate, with 5 cross bars, will carry any load you can put into the 38" space between tubes on a 14' raft.
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