[Rhodes22-list] Oil canning on the trailer
Todd Tavares
sprocket80 at mail.com
Thu Jun 9 00:42:51 EDT 2005
Peter and Joseph,
I borrowed a fellow Rhodie's trailer to bring my old 1974 hull to the dump. I used a clevis to attach a strap to the top gudgeon which I had the bulldozer operator hook onto his bucket to pull the boat off of the trailer. The boat came off fine, but the end of one of the bunks cracked. I replaced both bunks with the very best PT 2" x 6" x 12' boards that I could find at Home Depot. The bunk brackets are slotted where the 1/2" carriage bolts attach.
Over time, these bolts rusted and got loose allowing the bunks to bow excessively. If Joseph replaces the bunks and bolts, it may well solve his problems. The bunks on this (older designed) Triad trailer were 136 1/2" long and the holes were drilled almost center of the slot. I tightened the bolts with no weight on the bunks. I will have to ask the lender if he has any oil canning.
Todd
----- Original Message -----
From: "Peter Thorn" <pthorn at nc.rr.com>
To: "Rhodes 22 List Members" <rhodes22-list at rhodes22.org>
Subject: Re: [Rhodes22-list] Oil canning on the trailer
Date: Wed, 8 Jun 2005 23:02:33 -0400
>
> MJM,
>
> That's a good point and I agree with all of it except for the part
> about trailers not equipped with strap hooks. My 2003 Triad has
> two forward and two aft tie-down hooks welded to the frame made of
> 1/2" rod. Each one looks capable of securing the entire boat.
>
> I use two "X"ed cross straps to the stern eyes (like Roger) in the
> rear and a single long strap across the front. The front strap
> breaks just in front of the cabin house, right on the aft foredeck.
>
> Also, 1/4" chain from the winch tower to the bow eye. It's a big
> PITA to rig all that strapping, but worth it in peace of mind while
> driving.
>
> PT
>
>
> ----- Original Message -----
> From: michael meltzer
> To: Peter Thorn ; The Rhodes 22 mail list
> Sent: Wednesday, June 08, 2005 10:32 PM
> Subject: Re: [Rhodes22-list] Oil canning on the trailer
>
>
> heads up, part of what keeps the boat on the trailer IS the
> friction of the bunks. rhodes22 owner are NOT in the habit of
> strapping their boats down. The trailer do not nominally come with
> loop for straps. And I have broken 2 winches(the brakes) over the
> years. SO if you are going to do this make sure to add straps and
> padding for hull and deck, the time to set it up, and loosen the
> winch strap and replace it with tie downs.
>
> MJM
>
>
>
> Peter Thorn wrote:
>
> Slim,
>
> Overton's has them.
> http://www.overtons.com/modperl/overtons/detail/pdetail2.cgi?r=detail_view&item_num=27606
>
> I used 2x6 kiln dried #1 PTSYP (pressure treated southern yellow pine),
> available at the local lumber yard here - their best grade. H/D and Lowes
> don't usually carry such high quality. I picked quarter sawn boards from
> the pile for extra strength and stability. It's hard to improve on Stan's
> design, but it's fairly easy to use better materials for the bunks than
> Michael Orro has been using lately on the Triads.
>
> I think the low gear of that two-speed winch would pull stumps. When the
> boat and trailer is still wet it is easiest. Mark placed a mark on Raven's
> waterline stripe to match up with a mark on the Trailmaster trailer for
> ideal tongue weight. I installed a similar mark on the Triad and checked
> the tongue weight with a tongue weight scale. So, it's just a matter of
> winching the boat forward in the parking lot to match up the two marks.
> Thanks Mark -- good idea!
>
> Raven has a hard vinyl paint, which doesn't come off easily. A small amount
> remains on the bunks after launching.
>
> I hope this helps. Good luck!
>
> PT
>
>
> ----- Original Message -----
> From: "Slim" <salm at mn.rr.com>
> To: "Rhodes" <rhodes22-list at rhodes22.org>
> Sent: Wednesday, June 08, 2005 7:45 PM
> Subject: Re: [Rhodes22-list] Oil canning on the trailer
>
>
> Peter,
>
> I need to replace my bunks soon so I read your post with great interest.
> A
> couple questions: Those look like 2 X 6s - would 2 X 8s be better? And
> what are Tie-Down Engineer's bunk guides and where did you get them? You
> can winch the boat forward with boat and trailer out of the water?
> Really?
> It doesn't take off the bottom paint?
>
> Slim
>
> On 6/8/05 6:24 PM, "Peter Thorn" <pthorn at nc.rr.com> wrote:
>
> 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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