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Old 29-09-2017, 06:11   #1
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DIY Ropeye deck eyes?

These seem like they would be fairly easy to make your own. I was thinking a piece of dyneema tied into a loop with a button knot. Pass this through a small as possible hole in a g10 backing plate.
The harder part would be keeping the fitting water tight. You could fill hole in the deck around the dyneema with sealant, but won't look great and probably leak a little bit. Any better ideas to waterproof the hole in the deck? Maybe a watertight electrical compression fitting?
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Old 29-09-2017, 06:32   #2
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Re: DIY Ropeye deck eyes?

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Originally Posted by mrybas View Post
Any better ideas to waterproof the hole in the deck?
Screw cap underneath the deck, fill with silicon and screw closed.

Make sure you smoothly round all the edges of the hole thru the deck.

Also local reinforcement of the deck around the hole, with tapered edges, is usually prudent.

But you are right, they are easy to replicate.
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Old 29-09-2017, 06:44   #3
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Re: DIY Ropeye deck eyes?

Quote:
Originally Posted by mrybas View Post
These seem like they would be fairly easy to make your own. I was thinking a piece of dyneema tied into a loop with a button knot. Pass this through a small as possible hole in a g10 backing plate.
The harder part would be keeping the fitting water tight. You could fill hole in the deck around the dyneema with sealant, but won't look great and probably leak a little bit. Any better ideas to waterproof the hole in the deck? Maybe a watertight electrical compression fitting?
1. Water is going to wick down the inline of the line.

2. You'll need a bushing at the deck to prevent the line for either chafing on the FRP or tearing through it. From what I've seen load lines do to FRP, I think metal is better.

An interesting engineering challenge, if you want it to take high load in all directions and remain watertight.
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Old 29-09-2017, 06:53   #4
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Re: DIY Ropeye deck eyes?

Quote:
Originally Posted by thinwater View Post
1. Water is going to wick down the inline of the line.

2. You'll need a bushing at the deck to prevent the line for either chafing on the FRP or tearing through it. From what I've seen load lines do to FRP, I think metal is better.

An interesting engineering challenge, if you want it to take high load in all directions and remain watertight.


2. What about if the hole through the deck/hull was significantly over sized, then this area filled with sealant? The dyneema would be free to articulate without touching the hole through the deck. This would probably only work in applications where the load is always in the same direction, as too much movement of the eye would break the sealant's watertightness.
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Old 29-09-2017, 07:01   #5
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Re: DIY Ropeye deck eyes?

The application I had in mind was to replace the fitting where the bow sprit stays attach to the hull. The load direction doesn't change much, so chafe against the glass shouldn't be an issue. I'll likely use a a glass tube that is epoxied into the hull for the pass through area between inner and out hull skins. I can sand the inner lip of the tube to have a nice rounded edge.
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Old 29-09-2017, 07:10   #6
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Re: DIY Ropeye deck eyes?

Not being facetious, is this an engineering exercise, or do you have a specific need and purpose requiring this fitting. I used low St. Steel padeyes with low friction rings lashed on , on a visiting boat.
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Old 29-09-2017, 07:16   #7
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Re: DIY Ropeye deck eyes?

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Not being facetious, is this an engineering exercise, or do you have a specific need and purpose requiring this fitting. I used low St. Steel padeyes with low friction rings lashed on , on a visiting boat.
is above not specific enough?
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Old 29-09-2017, 07:18   #8
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Re: DIY Ropeye deck eyes?

When one looks at the prices for these, it's easy to see why one would want to DIY them.
So you're thinking:
- Oversized hole in the deck with smoothed edges, plus localized deck reinforcement.
- G-10 backing plate, with small hole for spectra loop.
- Spectra loop through G-10 plate, with button knot acting as restrainer.
- Sealant around spectra at deck penetration.
Mechanical WT cover filled with sealant on underside/back side of spectra loop
Do I have that right?
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Old 29-09-2017, 07:22   #9
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Re: DIY Ropeye deck eyes?

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Originally Posted by UNCIVILIZED View Post
When one looks at the prices for these, it's easy to see why one would want to DIY them.
So you're thinking:
- Oversized hole in the deck with smoothed edges, plus localized deck reinforcement.
- G-10 backing plate, with small hole for spectra loop.
- Spectra loop through G-10 plate, with button knot acting as restrainer.
- Sealant around spectra at deck penetration.
Mechanical WT cover filled with sealant on underside/back side of spectra loop
Do I have that right?
Yes, more or less what I was thinking. You could make them in a couple hours and cost maybe $25-50 in material (depending on how beefy you needed).
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Old 29-09-2017, 07:29   #10
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Re: DIY Ropeye deck eyes?

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Yes, more or less what I was thinking. You could make them in a couple hours and cost maybe $25-50 in material (depending on how beefy you needed).
Do you have a source for, or thoughts on, WT covers for the backsides?
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Old 29-09-2017, 07:31   #11
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Re: DIY Ropeye deck eyes?

There is always the old school approach. These can also be made by splaying the fibers out inside the hull or deck, providing both a backing plate and load distribution. Becoming common for chain plates.

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Old 29-09-2017, 07:32   #12
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Re: DIY Ropeye deck eyes?

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Originally Posted by UNCIVILIZED View Post
Do you have a source for, or thoughts on, WT covers for the backsides?
No, still trying to figure that one out. The button knot will be tight against the g10 backing plate, so this seems like a tough spot to try and make watertight. Maybe its easier to try and waterproof from the outside where the dyneema passes into the boat?
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Old 29-09-2017, 07:40   #13
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Re: DIY Ropeye deck eyes?

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There is always the old school approach. These can also be made by splaying the fibers out inside the hull or deck, providing both a backing plate and load distribution. Becoming common for chain plates.



When old school becomes new school. Here are my chainplates:
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Old 29-09-2017, 07:50   #14
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Re: DIY Ropeye deck eyes?

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is above not specific enough?
Apologies, your photos had not come up on my following at the time. I see your need.
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Old 29-09-2017, 07:54   #15
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Re: DIY Ropeye deck eyes?

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Apologies, your photos had not come up on my following at the time. I see your need.


No worries, you suggestion with pad eyes and lashings to low friction rings was my backup plan.
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