Newbie Questions About Project Boat

NickMcCabe

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I picked up a 1980 Beachcraft 16' trihull bowrider for $400 with the intention of fixing up, if possible. 50 horse Johnson and 15 horse kickermotor were down but I have the kicker running and the main motor is unseized, waiting on head gasket to start cranking it. Mechanically I think things are going good and I have a good understanding, however, I am lost on the actual boat part. I am hearing that I need to inspect the boat foam for water logging, but don't know how to access it since I don't believe there are deck hatches. I have also heard there is a need to inspect the transom. I looked in the gas tank area and saw a peice of wood in the back that seems to be in decent shape but I don't have anything near an expert opinion. Any advice on any of this would be great. This is my first boat, except for small jon boats.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

Particularly need advice on how to tell the condition of the transom, thanks.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

FYI don't know history of the boat but believe it spent most of it's life in Southern California (little rain). Hoping to do minimal work on deck and transom but want it to be safe.
 

pckeen

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Re: Newbie Questions About Project Boat

Hi Nick,

OK - so this is a fiberglass boat. To check the transom, do a visual inspection - look for cracks, etc. Then put your weight on the motor, and see if there is any flex - if there is no flex, then the transom is likely in good condition.

You can also take core samples from the transom - literally, drill into it from the inside to see what comes out (don't drill through). Light colored wood is good. Dark colored wood means rot. Do a search on iboats for 'core sample', and you'll get a bunch of threads on this topic.

Your best bet is to look over some of the restoration threads on fiberglass boats - a good bet would be one of jbcurt's fiberglass restorations - he's one of the experts on here. Try this thread.

To inspect the foam, you need to take the floor off. However, before you do that, check the condition of the floor. If the floor has soft spots, then that is a sign of rot - most likely your foam is waterlogged, and your stringers are rotten. If the floor is solid, your boat may be OK.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

Great info pckeen, the area around the motor mount looks great. Gonna check out floor this weekend and probably the core test (boats at my brother's house).
 

JNormV163

Seaman
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Jul 14, 2013
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Re: Newbie Questions About Project Boat

Hi Nick,

OK - so this is a fiberglass boat. To check the transom, do a visual inspection - look for cracks, etc. Then put your weight on the motor, and see if there is any flex - if there is no flex, then the transom is likely in good condition.

You can also take core samples from the transom - literally, drill into it from the inside to see what comes out (don't drill through). Light colored wood is good. Dark colored wood means rot. Do a search on iboats for 'core sample', and you'll get a bunch of threads on this topic.

Your best bet is to look over some of the restoration threads on fiberglass boats - a good bet would be one of jbcurt's fiberglass restorations - he's one of the experts on here. Try this thread.

To inspect the foam, you need to take the floor off. However, before you do that, check the condition of the floor. If the floor has soft spots, then that is a sign of rot - most likely your foam is waterlogged, and your stringers are rotten. If the floor is solid, your boat may be OK.

Mainly what he said. I was very optimistic about my boat thinking it didn't need much work. Thinking one weak spot couldnt possibly make that big of a deal. I was wrong. Do the drill test. It worked well for me. I'm restoring the whole boat and as far as I'm concerned its much easier than restoring a car for example. Learn as much as you can and you'll gain the confidence to tackle any job you want. My boat is from the early 70's and like everything back then it was a simple design. Idk about whats changed since the early 70's but I cant imagine much. Regardless what It needs I recommend fixing it. I would have regret selling mine.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

What's the best specific location for the drill test and what size bit? Also, how should I be inspecting the deck, stringers and foam? I can peel back the carpet but that will only show the deck surface. If that looks good should I stop there or cut some of the deck to look under or ? Thanks
 
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JNormV163

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Re: Newbie Questions About Project Boat

What's the best specific location for the drill test and what size bit? Also, how should I be inspecting the deck, stringers and foam? I can peel back the carpet but that will only show the deck surface. If that looks good should I stop there or cut some of the deck to look under or ? Thanks

I would say the smaller the better. Regardless the size you're gonna get the same effect. Where, doesn't really matter because regardless you're gonna want to patch it up if it does come back dry (inside the boat or outside). I would check the lower part of the transom because in my opinion that where water tends to rest. Gravity is a Bi***. I would have to see your deck but the way mine was set up I pulled the fiberglass off the top of the deck or I took a mini saw and cut around the lip of the wood deck and fiberglass lip. (hope that makes sense) Youre definitely going to have to check underneath the deck though. My deck was pretty solid but stringers... not so much. If everything checks out re fiberglass the deck back in, carpet and go fishing.
 

pckeen

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Re: Newbie Questions About Project Boat

In terms of the drill test - check several locations, preferably in areas you cannot see - but check up and down the transom. By way of example, in my (tin) boat, the transom is beginning to go at the top, but not at the bottom, because of the location of a seal on the splash well. In terms of checking out the deck, if you wanted to go for a full restore (which is a tremendous amount of work, and your boat won't be ready this season), then JNorm's approach makes sense. If I were wanting to use the boat sooner rather than later, if the transom is solid, and the deck seems solid on a surface inspection, - i.e. no sign of soft spots - I would just use the boat. I would be very hesitant to begin cutting holes in a deck that seems solid if I wanted to use the boat. Of course, you won't know for sure the condition of the stringers.

When I have inspected decks, I have not removed carpets - it often isn't just a case of peeling carpet back - as the carpet may be secured in place under the deck, or under side panels. I have simply carefully walked over the deck - putting my weight on everything - to see if there is any sign of softness.

Another potential approach to checking stringers and foam is to core sample the stringers and the foam. I understand this is the same approach as for core sampling the transom, but I don't know enough about that to give good advice on it. I would pm some of the guys who have done this before. Jbcurt has a great deal of experience about this. You might also do a search for core sampling foam and stringers.


Good luck!
 

pckeen

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Re: Newbie Questions About Project Boat

Oh yes - post some pics - that will give us all a much better idea of what you are looking at - users may be able to diagnose problems simply from the pictures.
 

surlyjoe

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Re: Newbie Questions About Project Boat

If you want to see whats under the deck without mucking stuff up, a platic deck plate is always good . they dont look too bad and it lets you get core samples off the stringers.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

Thanks for all the input guys. My strategy has been to see if I can get the motor running before putting any money or time into the boat itself. Today I got the motor to fire off so I feel like it is finally time to really start looking at the boat itself. Before I left today, I peeled back a little carpet near the gas tank and saw what looked like a good piece of plywood. I was able to lift that and underneath I saw solid fiberglass. I was expecting to see the stringers (lumber) but don't really know what they are supposed to look like. Are they under the fiberglass that I was seeing? The deck throughout feels solid. The boat seems like it may have spent a lot of it's life in a garage and when it was outside, it likely saw little rain as I am in Southern California (desert). Can someone give me a brief overview of what the construction of the boat is like under the deck and provide input on what I was seeing when I lifted it near the stern? This is a trihull boat.
 
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NickMcCabe

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Re: Newbie Questions About Project Boat

FYI not interested in doing a restore, just want something I can safely take my family out in.
 

surlyjoe

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Re: Newbie Questions About Project Boat

the stringers (lumber) will be encased in fiberglass and run fore/aft. also they may just look like the sides of the space your looking in depending on the height of the floor.
 

NickMcCabe

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Re: Newbie Questions About Project Boat

Okay, thanks. Is it okay to use water liberally to clean the inside of the boat?
 

NickMcCabe

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Re: Newbie Questions About Project Boat

I think I am going to take a 1/4 inch drill bit and drill into the fiberglass floor near the stern and see what comes up. If it comes up dry I am just going to use the boat and not worry about water logged foam or rotted stringers. I'm really just worried about carrying a bunch of extra weight in the foam. I keep hearing this is something that needs to be checked out.
 

surlyjoe

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Re: Newbie Questions About Project Boat

I hose our boat out with the garden hose when I scrub the carpet, but I am also sure that the floor is sealed up so no water gets into the wood...

like PCkeen says, if theres no soft spots and no signs of rot, your probably OK! I have seen 50 year old molded plywood garage queens that looked like new!
 

pckeen

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Re: Newbie Questions About Project Boat

There are those who disagree, but the prevailing opinion seems to be yes, you can hose down a boat - boat's get wet - but make sure it can dry afterwards. By way of example, don't spray it down then throw a tarp over it, as this will prevent the water from getting back out. Make sure the boat, if trailered, is trailered bow up - so the water can drain out of the plug at the back.
 
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NickMcCabe

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Re: Newbie Questions About Project Boat

Thanks guys, good advice. Feel like I'm learning a new trade here.
 

jbcurt00

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Re: Newbie Questions About Project Boat

Thanks for all the input guys. My strategy has been to see if I can get the motor running before putting any money or time into the boat itself. Today I got the motor to fire off so I feel like it is finally time to really start looking at the boat itself. Before I left today, I peeled back a little carpet near the gas tank and saw what looked like a good piece of plywood. I was able to lift that and underneath I saw solid fiberglass. I was expecting to see the stringers (lumber) but don't really know what they are supposed to look like. Are they under the fiberglass that I was seeing? The deck throughout feels solid. The boat seems like it may have spent a lot of it's life in a garage and when it was outside, it likely saw little rain as I am in Southern California (desert). Can someone give me a brief overview of what the construction of the boat is like under the deck and provide input on what I was seeing when I lifted it near the stern? This is a trihull boat.

Unfortunately, without pix it becomes difficult to determine exactly what you're seeing under the plywood you lifted.

Q1: Was the plywood completely unsealed, directly below the carpet?

Q2: Is there any indication that the interior of the boat has had 'recent' work done on it? Anywhere?

Q3: You were able to easily lift the plywood, and there was NO fastening of any type holding it to the boat's structure?

Q4: How big a piece of plywood did you lift? And where did you lift it?

Q5: Did it appear that the 'solid' fiberglass you saw below the plywood was textured in anyway? Or more importantly, had an imprint from the plywood's down side (where 1 used to be attached directly to the other)?
^^^^ Do those 2 Q's in #5 make sense?


PC: Thanks for the vote of confidence, but I am more of a 'former'-pert then an expert, by any means.

Back to Nick's boat:
W/out pix, it's a carp shoot to accurately access your boat, remotely via the internet. But you asked for opinions & info, so here's what I got so far:

Familiarize yourself w/ boat terms & their construction. It will help you ask questions that will get the best & most accurate responses.

Typical boat:
chine.gif


It sounds as though your boat has had an overlaid deck (floor) put down ON TOP of the original boat deck. When you said you pulled back some carpet & lifted a piece of plywood to expose 'solid' fiberglass under it, that doesn't sound typical.

Depending on where that plywood was lifted, you may have been looking at the hull out near 1 of the chines. Some boat deck plywood is supported by stringers near the long centerline of the boat, but out near the edges where the deck terminates at the hull sides, it may be resting directly on the upside of the hull bottom along the chine.

Look thru WOG's transom, stringer & deck replacement info:
"Fabricating Decks, Stringers, and Transoms"

He is certainly an expert. There are a BUNCH hanging out here in the dry dock. All are willing to help you get this boat back in the water safely, during both rehab (PPE required for a lot of what likely needs to be done) and done right so that you can be confident taking you & yours out safely & use (enjoy) the boat for decades. Then you'll also have no concerns selling it to someone else when you're ready to move on to another boat.

You can learn a lot about general boat construction, demo & put back by reading other resto threads.
 
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