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Built an uber simple fishing frame for my raft and I'm currently using 1 inch conduit tubing. I'm thinking of now using square tubing so that I can easily install rails to mount accessories on. Any problems I might run into using square tubing?
 

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Round and Square Bent Metal Tube | The Chicago Curve

For fishing on moving flatwater, I bet you'd be fine. And if the frame folds, at least you're in flatwater.

If you've got waves and rapids and such to deal with, the strength of round tube might be worth the awkwardness of mounting stuff to it.
Thanks for the info. Yes it will mostly be use I flat water and maybe waves here and there.. No white water at all. Only use my raft for lake fishing really.
 

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square vs round

Built an uber simple fishing frame for my raft and I'm currently using 1 inch conduit tubing. I'm thinking of now using square tubing so that I can easily install rails to mount accessories on. Any problems I might run into using square tubing?
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Shape factors: Square or rectangular tubing will be stressed across the tension and compression face disproportionately since the web is incapable of uniform distribution. A round profile will not share the same issue but will be more flexible for a similar mass, hence the 17% upfactors for round sections bending linearly. Round sections also feature hyperbolic welds which are stronger about multiple axis.
 

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I have built them both ways. My favorite now is combination of round and square, Square is strong in 4 directions round is strong in all directions. If you don't have a bender square is easier to make corners.
 

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