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Old 03 August 2016, 21:21   #1
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Clearance between tube and guide post

Hi, I'm trying to install guide posts on the trailer for my 4.3m RIB. How much clearance should I allow? The post is made of PVC and does not rotate.

I've set the clearance to half inch now, but haven't tightened the bolts yet until I hear from you guys, hopefully with a single and correct answer :-)
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Old 04 August 2016, 06:42   #2
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How much error can your trailer accommodate and still align the hull? If you think of it as being a tool to make sure that the hull lines up with the rollers / bunks right that should answer your question. I don't have guides but 1/2" seems very tight. Not sure what/if there is a downside to being too tight, but I don't see any advantage of being 1/2" rather than 1-2" as the trailer can't be that close anyway (or it would be impossible without guides).
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Old 04 August 2016, 09:44   #3
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I have mine pretty tight. The rub rail hits the posts, so no harm done from friction.

That said, when you need them the most (loading on a river with current running), they tend to flex enough to be largely useless (though I suppose they keep the boat from getting way too far out of line.) I often end up hitching the bow and using the motor to keep the boat lined up as the trailer is pulled from the water (can't do that recovering solo though.)

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Old 04 August 2016, 13:38   #4
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I've gone for an inch each side with a platic pipe over the steel up right on my docking arms to act as rollers and find I can just bounce the sib over to line up if needed but a god send in a cross wind. I made mine out of key lock hand rail parts and if needed I can undo an Allen key and take the upright off if required ( if it rubs. )

Cheers
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Old 07 August 2016, 14:31   #5
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Thanks for all the input!

I ended up making the posts very close - they are about 1/4 inches away from touching the rub rails. I launched and recovered the boat by "walking" it off and on. There wasn't any issue. After I recovered the boat, it was leveled perfectly.

In the past, the back of the boat would be off by a few inches and I would have to make it level by lifting one of the tubes at the back and push.
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