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 Post subject: Kens, lifting eye
PostPosted: Mon Oct 26, 2009 4:15 pm 
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Location: North Carolina
This is the eye I was speaking to you about. The recessed shoulder gets mortised into the side frame or transom and then has a stainless steel allthread with locking nut and lock tight.
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http://www.iboats.com/Perko_Heavy_Duty_ ... ew_id.5350


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 Post subject: Re: Kens, lifting eye
PostPosted: Mon Oct 26, 2009 5:26 pm 
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Location: Coastal Georgia
that is the best transom eye that i have seen yet. I really want a clean transom and that is the best one yet.

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 Post subject: Re: Kens, lifting eye
PostPosted: Mon Oct 26, 2009 7:25 pm 
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kens wrote:
that is the best transom eye that i have seen yet. I really want a clean transom and that is the best one yet.

To minimize compression into your wooden veneer, I would use a thin wood washer to match the outer ring. I would use an oversize piece cut thin, boring the appropiate inner hole and then fitting that and after you get it just right mark your outside. Then bandsaw the line fat and sand to fit the flush ring.

This will keep the lift from working any at all into your beautifull wooden transom overlay. Don't be surprised of you see some splitting as you bed and secure in place of the thin wood. But consider that piece a sacrfical piece to save your transom wood from getting water if punctured into the veneers.


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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 3:34 pm 
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Stylish. But what about strength? A 3/8" horse shoe holds real good! :?

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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 3:42 pm 
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switherington wrote:
Stylish. But what about strength? A 3/8" horse shoe holds real good! :?

:?

They have been used to lift wooden power boats up to around middle 20 footers for years.

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Safe working load: 3,000 lbs.


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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 4:02 pm 
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Do you think it would be ok for pulling skiers?

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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 4:17 pm 
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Location: North Carolina
switherington wrote:
Do you think it would be ok for pulling skiers?

I have no idea. I am not an engineer and have never really played one. :wink: I know that lifting and pulling can be two different animals.
The materials are completely different than the bow eyes, a common item used on sterns of a boat. But also you must keep in mind of the structual portion of your build in that area. I use serious quarter knees that are thru bolted in the transom and thru the inwales and out to the rubrail materials which is also in the areas of the mounting of the bow eyes. In conjunction with the covering boards that are also normally fastened to both the sides and the transom cap, thats pretty structual for snatching loads which is also independent of the materials that is used for the actual eye. In the original request that I noted, lifting was being discussed. The shoulder gives a huge margin to add to the ability to lift in his application. A dead lift with the eyes mounted on the foward deck depends on the fastening of the fine threaded rod and the structual integrity of the area.

Quote:
Cast manganese bronze - chrome plated.


For some perspective bow eyes made of stainless is shown on this link.

http://www.go2marine.com/product.do?no=22790F

Breaking strength for the double 3/8" is 16,000 lbs. The 1/2" double rod is rated at 28,000 lbs.


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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 4:31 pm 
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Once you get the strength you need, the rest is overkill. If those lifting rings would do the job, it would be great to have something that looks good too. :wink:

Sam

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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 4:33 pm 
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Since I have a inboard, there is no transom knee for strength.
I wonder if I should lift it via the motor stringers?

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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 4:37 pm 
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kens wrote:
Since I have a inboard, there is no transom knee for strength.
I wonder if I should lift it via the motor stringers?

A transom knee is different than quarter knees. Sam's particular need is a bit different.

If you have a transom frame that extends up the sides and fastened to the transom, its a pretty good bet that you have the structual portion for lifting straight up taken care of. Your boat weight will be divided and transfered through three points which divides the dead weight in a lift situation.


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 Post subject: Re: Kens, lifting eye
PostPosted: Tue Oct 27, 2009 5:35 pm 
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If you could lift it from the stringers,that would be great. That's how they lift hydros in & out at the races.

Maybe through bolted eyes, two forward & two aft below small hatches so they are below the sole.

why do you want to lift anyway?

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 Post subject: Re: Kens, lifting eye
PostPosted: Wed Oct 28, 2009 4:17 pm 
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"why do you want to lift anyway?"

Many marinas near me have a lift but no ramp. The lifts open me up to a lot more water around here.
also, the lifts aviod dunking trailer in saltwater.

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 Post subject: Re: Kens, lifting eye
PostPosted: Wed Oct 28, 2009 4:47 pm 
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Location: tarpon springs fl
The ones around here either use straps under the hull,or long forks on a fork lift.

I see your points.

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