[Rhodes22-list] Oil canning on the trailer

[Peter Thorn]

Joseph,

I replaced the 10' non pressure treated larch bunks on my 2003 Triad with
12' kiln dried Pressure Treated Southern Yellow Pine #1 grade lumber (no
knots).  As far as softwoods go, this is a very strong material and has a
very high fiber stress rating.  Although it is flexible, under a load it
deflects less,  so it more evenly distributes the boat's weight across the
bunks instead of point loading in the corners, like a lesser wood might tend
to do.  At Stan's suggestion, I cantilevered the bunks 1' at each corner.
Haven't had even the hint of oil-canning.

The plastic covers are Tie-Down Engineer's bunk guides.  Two kits did the
bunks and inner keel guides.  These just make the boat more "slippery" on
the trailer, so I can crank it slowly forward in the parking lot to
precisely load the tongue weight up to around 400#.  After reading Rik's
website and some of his writings, I also changed to a two-speed winch for
the same purpose.  It all works together beautifully!

It you decide to go to all this trouble, you might also want to replace the
trailer bunk bolts with stainless.  This extra expense insures you won't
have to do it again for a very long time.

Good luck.

PT
Raven
Chapel Hill, NC



----- Original Message ----- 
From: "J Cook" <joscook at msn.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Wednesday, June 08, 2005 4:35 PM
Subject: [Rhodes22-list] Oil canning on the trailer


We just pulled our boat for a little paint-up, fix-up, clean-up time.

I remember seeing a post, a while back, trouble-shooting oil-canning when
the boat is on the trailer. ( Hope I got that definition right.  Where the
forward ends of the bunks press against the hull, I am finding a bit of
impression on both sides.)

Before putting her on the trailer this time, I moved the winch bracket
forward about 2 inches. I also put a drop hitch in the reciever), and the
bunks were significantly less angled on the ramp than before..

We ratcheted the boat up snug, pulled up the ramp, re-snugged, backed down
again, re-snugged again and repeated a couple of timed until her bow was
well rested against the Y.  But I'm still getting a bit of inward bound to
the hull.

The boat's weight is bearing on the two 128" bunks and one roller at the aft
end of the keel.  No weight is on the two runners, which I assume serve only
to guid the boat onto the trailer.  There is no front roller on the
Trailmaster trailer.

Any ideas for an easy fix?  I don't recall if anybody has tried lengthening
the bunks to 12 feet or instaled a front roller.  I guess those maight be
options.

Hopefully, she's going back in the water soon, so I can get another shot at
adjusting the trailer.

Thanks

Joseph Cook
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