2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

jeffg42669

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Joined
Oct 16, 2012
Messages
9
Hello to all, this will hopefully end up being a very informative thread when it's finished up - I plan on documenting as much as possible to share with everyone and do my part in contributing to an incredibly resourceful forum and source of knowledgeable souls.
Ok here's the situation - The boat is a 2003 Oden 28 Sailboat (called a Mast28 in a lot of places here in the states). It was trailered down from PA to FL when my Dad bought it a few years ago, has been in the at the dock on a lift since then until recently when we had the hurricane scare a couple months ago. The trailer had been in storage and I decided to take the boat out of the water for the duration of the storm (4-6' tide rise was expected). Anyhow, the stem got damaged from the trailer when we pulled it out - the center V-wheel (don't know the proper name) was bent and I did not know it, the V-wheel didn't turn; it should allow the stem of the hull to roll on it - hence, it dragged on it and caused some pretty serious damage.
In hindsight - the trip from up north is more than likely what caused the damage to the trailer V-wheel thing with over 1,000 miles of travel - taking the boat off the trailer then did not alert us to the problem as the boat basically floats off the trailer, it wasn't until we used the trailer years later that it came back to bite... I inspected the trailer fairly well (or so I thought) and put my hand on every roller on the trailer except this one! True story...
FYI - I didn't know of the damage until I put the boat back in the water, couldn't see it when it was on the trailer and had no reason to be suspect of it at the time. This sailboat boat is a water ballast design with a swing keel (very much like a McGregor sailboat), it's a unique ballast / swing keel system that allows for the boat to be trailered fairly easily. When the boat was back in the water off the trailer I didn't know it was taking on water because the damage is in the section of the stem where the water ballast normally fills with water anyway - discovered the problem when we got back to the dock and raised the boat on the lift! Had this not been a water ballast type of boat I would have had VERY bad day...
The pics should make my description of things much easier to comprehend :)

In attempting this repair, I am going in with a pretty solid true working knowledge of fiberglass - I've done a few different layups and some mold work but have never done an extensive repair to a finished hull.
This is obviously a high stress area on the hull (at least when it's on the trailer) and I intend to complete this with more strength than what was original. The problem is going to be that I will have rather limited access to the inside, I will have to cut an access panel into the ballast area to get to the actual stem of the hull where the damage is.
Before getting into more than basic details of what I've got in mind, I'd love to hear some input from the gallery O' knowledge and see what those with more experience than myself have to say.
My basic plan is to sand / grind the area down to the 'glass with about a 3-4 inch radius around the damage to feather it out and look for any signs of cracks as well. Grind, cut / bevel actual damaged area out (taking away only what is necessary). Cut an access panel to reach the inside. Grind / sand / clean and layup several (probably 4) strips of 1708 up to at least 6" outside of damage, possibly create a fiberglass inverted U-channel with a peice of 1/2" - 5/8" rope for additional strength along the interior of the V of the stem.
On the outside, depending on how much I had to open up - fill in gouged area with peanut butter and a bunch of strands from csm. Do a little bodywork and spray gel coat w/ mod-C, sand, polish.
Seal up access hole in ballast area of the hull on the interior and call it a long day...

Here's the pics that will tell the story:
Mast28 hull 1.jpgMast28 hull 2.jpg
 

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Bob_VT

Moderator & Unofficial iBoats Historian
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Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Welcome to iboats.

I will yield on this however....Yacht Dr. is one of our resident experts who has done that type of work on larger sailboats.

Hopefully he will pop in and comment ;)
 

jeffg42669

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Joined
Oct 16, 2012
Messages
9
Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Here are the other pics, these are shots of the inside above the damage where I will have to cut an access panel to get to where I need to be and also a few shots of the trailer so ya'll can have a clear idea of what happened. Murphy strikes again...

- Jeff
Interior Overview 2 copy.jpgInterior Overview copy.jpgMast28 trailer 1.jpgMast28 trailer 4.jpgMast28 trailer 5.jpg
 

Yacht Dr.

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Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Its a breach in the stem ..

The best thing you can do is grind and grind some more from the outside.

Open up that repair to see what is going on ( inside is the last step ).

Grind away the bad glass and post up some pics of what your dealing with now ..

YD.
 

jeffg42669

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Joined
Oct 16, 2012
Messages
9
Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

I'll be getting to work on this on Sat, have to travel a few hours to get to where the boat is and will only be there for the weekend. I'm thinking this is going to be a two weekend job...
Ok, I'll work from the outside first in grinding.
Question: Should I bevel the entire edge of the holes / openings towards the outside? Approx what angle am I looking for on that edge - 30-45 degrees?
Is there some sort of chance this will be an outside only repair? Is that why you are telling me that inside is last?

Thanks!
- Jeff
 

jeffg42669

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Joined
Oct 16, 2012
Messages
9
Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Ok, today was grinding day and I used a rotary buffer / grinder with a 7" backing plate on it and a disc of 60grit. This is one of those times when you want to be sure to have a breather mask on it, I was outside and it was a windy day - there was still a considerable dust storm from my grinding. As you can see in the pics, the breach is really just to the left side of the apex of the stem. The area where I ground out further up on the left side is I can feel the most weakness in the fiberglass and wanted to have a good look at it, this area along with the stem itself is where I am thinking I will need the most build up and support / strength added to the backside.
I've still got more grinding to go with a smaller wheel (got a 2" rol-loc backing arbor w/ 80grit discs that I will use in a dremel).
Today was difficult conditions, I am in a small dinghy under the boat and was dealing with 30mph winds all day from the storm that is currently cruising by the south east coast of the states. Trying to remain anywhere close to steady was easier said than done.

From the pics I've got here, what are the thoughts on how to proceed?
Unless given contradicting input, I still plan to have to get to the backside of this repair to give it strength. I'm very open to thoughts, comments, suggestions...

Thanks!
- JeffIMAG1582.jpgIMAG1583.jpgIMAG1587.jpgIMAG1589.jpg
 

jeffg42669

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Joined
Oct 16, 2012
Messages
9
Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Here's the supplies I got from uscomposites.com
I ended up calling them, excellent service in placing the order over the phone and shipping was fast, pricing was very reasonable. I ordered enough for this repair and some damage on the rudders that I need to attend to while mixing things up
- Jeff
IMAG1580.jpg
 

Yacht Dr.

Vice Admiral
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Messages
5,581
Re: 2003 Mast 28 Sailboat hull repair - damaged by trailer - Could use some advice!

Sorry for the long delay ..

From your pics it looks like you should grind more. Bevel the crack to a razor thin edge.

You will have to glass on both sides. But at least on the inside you will be able to remove the gelcoat ( if there is any ) to raw glass and lay up about 4-5 layers of 1708 starting with 1.5 oz mat.

Take some more pics when your done grinding.

YD.
 
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