1984 2001 rebuild. Pete, go away. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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I suppose if it worked, some big outfit like Bayliner would use it,think of the money they could save with the amount of boats they crank out. |
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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To those have concerns and express your concerns with some logic, thank you. To those who are unfamiliar with the product and are just saying "no" with no real evidence or knowledge, your opinion does not matter much. Gary S, bayliner would never use anything that doesnt cost the bare minimum, which trex is not. Price a wood deck and a trex deck and you will see there is a vast cost difference. Isnt there boat companies who make stringers with just fiberglass? Doesnt the structural shape of the glass have a considerable amount of strength? I feel if im glassing them in, I should be good. Also, so no one gets confused, I am only doing the secondaries this way (if the epoxy test joe does comes back good), the main stringers will be sea cast.
Here are some pics, the ones in the field are the day I bought it. |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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Composite stringer thread
Yes, the glass "shell" around the stringer will give the boat the necessary rigidity, you don't actually need anything inside the stringer... however, the caveat is that you need to know how thick the fiberglass shell around whatever core you use needs to be to make up for the lost strenght of the original wood stringer core. If I could difinitively determine the loads that the boat would see, and how in my garage I could acheive the strength necessary to with stand normal loads and safety factor, I would use glass around foam as seen in the post 93 boats. Since you are a boarder and are probably going to attempt balast at some point, you need to consider what effect the extra balast weight has on the hull/stringer system too... in effect, the hip bone connected to the leg bone... etc. |
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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Dreaming, yes I will beef up the glass on it, I just really want the trex in there as a solid piece to screw the decking into.
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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why do seacast at all? Would it be too difficult to do a foam filled fiberglass stringer? I suppose the seacast could be simpler and less risky as it is a proven method. But if you were good with the glass I would say save your money on the seacast and go fiberglass.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Presumably you mean the floor... but why do you need to screw it down? |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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ok so your last post may have answered my question. need something to screw into, disregard prior post.
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Swatkinz
Platinum Member Joined: December-03-2003 Location: Lexington, SC Status: Offline Points: 1307 |
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the title of this thread alone makes it worth the read
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Steve
2011 Sport/Air 200 Excalibur 343 2017 Boatmate Tandem Axle Trailer Former CC owner (77, 80, 95, 88, all SNs) Former Malibu owner (07, 09) |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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Trex doesn't hold a screw all that well. I like you're thinking with wanting to screw down the floor, but more to hold it while the glue dries as opposed to being the permanant fastening solution... Since the floor acts as an interlocking piece with all the rest of the structure, it takes quite a bit of the transfer load when the hull flexes. Bedding the floor to the stringer will help with load transfer. If the floor moves at all, a good deal of the transfer will be lost while the floor is pre-loading. |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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If you've been able to figure out how much to beef up the glass, I would be really curious on what you came up with and how you arrived at the thickness needed.
Something else you may want to consider with the trex is its rate of expansion vs the glass hull. Trex has a tendancy to "grow" when it gets hot. Have you come up with a way to mitigate this? seems part of the reason the original glass shell around the stringer cracks is due to expansion when the water freezes inside the wood. You might have the opposite effect in this case where the expansion of the trex would pop the glass when it gets warm, and shrink in the cold. this actually might be a good argument against having the glass stick to the trex... |
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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I don't know the forces on the hull from the water, or from the engine so I don't know those calculations. I have put some thought into the expansion though, and this is what I have come up with. The coefficient of linear thermal expansion of douglas fir is 2.7x10^-6, which is in the boat originally. Epoxy resin is 31x10^-6. Trex is made of roughly 50/50 wood and polyethylene. Polyethylene has a thermal coefficient of 111, and 60 x10^-6 for high density, which are both used in trex. So, they average out to 85.5. Average that with the wood in the trex, 85.5 + 2.7 = 88.2/2 = 44.1. So I know its a very rough number, but lets say the trex has a thermal coefficient of 44.1x10^-6. I don't know the length of the secondaries, but lets go with 12 feet, and the temperature change is from 10 degrees to 100 degrees, the epoxy will expand 0.033" and the trex will expand 0.047". Thats a difference of 0.014", or about 5.5 human hairs over 12 feet. Is this math complete b.s., or will it work? I'm not an engineer, so if this kind of thing is your baby please chime in. I do think the trex holds screws pretty well, not as well as a pressure treated 2x, but enough to keep 5/8" ply down. As long as the stringers are solid, the floor will not have very much upward force on it. Sorry if none of this post makes sense, its been a long day.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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I'll chime in on Tim's comment on the screws. I have always recommended using screws only as a temporary means of holding two pieces together untill the thickened epoxy sets up. Then removed and filled. Any screw is a stress point and I've seen failures and the screws in both wood and glass. Bedding a complete bonding surface with epoxy is my suggestion. (Tim mentioned it too)
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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max, why are you going this route? im just curious
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"the things you own will start to own you"
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Guests
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Awsome looking boat.., gel and interior look good still. is that bottom paint?
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Guests
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I think it makes perfect sense |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Exactly. Screw retention for the floor should be a non-concern. Unless your ply floor is really warped, screws wouldnt even be necessary as a temporary means of holding it down while the adhesive cures... a bunch of weight works just fine. I can see the argument that the trex would simply be a form in which you shaped your glass stringers. Theyre also composite (no rot) and readily available... However, youre going to have to bulk up your glass schedule over them significantly to compensate for their lack of strength. That partially (if not totally) offsets their attractive price, as compared to something like coosa or airex. Those options are better for a true core material, as they are much stronger. If you were to consider using the same on the primaries (in place of seacast) then the cost of a sheet or 2 may be in line with your current projected expenses. Something to think about. |
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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Eric, this route is just something that I've been brainstorming the past few months. Brian, the gel is in great shape and the upholstery is flawless, which is a shame since it's that hideous red/burgundy color and I would like white. And yes, it is paint on the hull bottom. Trbenj, I'll glue and screw the floor. Im sure I'll put more thought into the coosa after I meet up with Joe.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Yes, I realize that is your current plan... my question is why youre planning to do it this way. Taking a step back and thinking outside the box is great- it makes you question "the norm" on the way things are done... but I dont understand your rationale on the screws. Like was mentioned above, theyre not needed for a good floor/stringer bond, and they'll create both a stress point and a possible intrusion point. I think that screw retention is insufficient justification to use trex. |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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If its flawless and original you may be able to carefully remove and get a few hundred bucks. I am sure there is someone on here with an 84 that needs upholstery. |
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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Will you be keeping the Black Anti-Fouling or do you plan to remove it?
Curious on Gel condition underneath it. |
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Guests
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i am more curious as why it was painted...salt water?
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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I believe the boat was originally from Long Island, so yes I think that it spent some time in salt water hence the Anti-fouling. Who knows how the gel looks underneath, thats not on this winters do to list, although I would like to get rid of it to reduce the friction on water. Although, at times I think it along with the black stripe kind of makes the boat look like a police boat, which always kind of makes me laugh. I might throw on a PA system and be the lakes party police.
JLLogan, I already planned on tossing the upholstery on here once I get some new ones made in the future, but thats not in this years budget, i'm already cutting into this winters skiing funds as of right now. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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definetely a salt water boat..you can see the sacrifical anode in the rudder....
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<a href="">1992 ski nautique
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MinaquaWI
Newbie Joined: May-02-2011 Location: Hudson, WI Status: Offline Points: 25 |
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How about liquid nails Subfloor and Deck adhesive to glue your flooring to your stringers? It has a 450psi sheer strength after 28 days of cure. Engineers?
On another note, I had a 1985 Malibu Skier and the floor was glassed to the hull (topside only) and was stapled to the stringers. I thought that was an interesting and subpar method. |
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Current - 1991 Sport Nautique, 1970 Glastron GT-140, 1970's MasterCraft Jump Boat
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Nick, If you are doing a epoxy system, keep it all equal and use the same. You've been over looking at the "home improvement" places too much!! BTW, look up how hydroscopic liquid nails is!
What do you expect from MB? |
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MinaquaWI
Newbie Joined: May-02-2011 Location: Hudson, WI Status: Offline Points: 25 |
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Hmm, the MSDS only says resistance to water is "very good". Pretty specific, huh?
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Current - 1991 Sport Nautique, 1970 Glastron GT-140, 1970's MasterCraft Jump Boat
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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Met up with Joe, he's going to test the epoxy on the trex. It was cool to see his boat, totally inspirational.
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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I feel your pain 2001 brother, no time, money and I surprised how many aches and pains I have from crawling in and out of that boat. Good luck and keep us updated. I know joe will probably be around to give you some pointers as well, thats a good resource to have in your backyard!! |
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Maximal691
Senior Member Joined: July-26-2011 Location: Saratoga ny Status: Offline Points: 109 |
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I have the time right now, just no money. Paying your way through college is tough without taking loans out. To the people who noticed it was at one point it was a salt water boat, this doesn't bother mensince it's getting a new power plant. If it was a big boat with two v8's that i didn't plan on replacing I would be more concerned. One of the ideas that Joe and I came up with while talking shop, is using a sheet of coosa for the decking where the driver and observer seat are mounted, so there are no spots for screw holes to rot the decking. This is good because I can save money by doing the decking where nothing is screwed, with ply, and only have to buy 1 sheet of coosa. To those who haven't seen it, Joe gave me some scraps and this stuff is pretty awesome. To the guys in the capital district, if you want to see it first hand let me know. Also last night Joe and I were talking about the weight of the trex, and I think I'm going to use azek for the ribs for weight concerns. For those who don't what it is, it's a popular trim for houses made out of PVC. You cn get it in nominal board sizes as well as 4x8 sheets. With the sheet sizes you could cut out bulk heads or something else of that nature. I thought of it as a floor option too, because it could be a maint free floor, without carpet (you can get it in white, but might be slippery) but I'm almost positive it wouldn't hold seat bases in, and the supports underneath it would have be around 11" because it's not that ridgid. Pete, i have full intentions of using epoxy and not liquid nails.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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It will be interesting to find out the results of Joe's epoxy adhesion test on Trex but here's just a bit of info. Here's how epoxy just "pops" off polyethylene. What Joe's test will prove is if the addition of the wood flour to the polyethylene will increase the adhesion. I suspect not since I feel the wood is pretty saturated with the hot (in liquid form) polyethylene. Dave (our plastic expert!!) - any help here?
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