Fiberglass boat building tips uk,how to build a wood roof joists,gloucester dory plans - You Shoud Know

Published 23.01.2016 | Author : admin | Category : Diy Sailboat Plans

Location: The Netherlands For bonding (ply)wood to polyester, grind down the gelcoat of the polyester, and glue with epoxy glue.
Before you glue the wood to the polyester, coat it several times with epoxy resin, then paint with 2K PU paint. Tremblay 228 » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post fiberglass boat building? When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
Location: Duluth, Minnesota Here is the boat, pump, resin trap, and the end product. Originally Posted by Steve W Jorge, i also find that I get a drop in the first couple of minutes and then it holds, this is true of almost every bag, unless of course we have big leaks.
Nice job, must have been fun getting it all to stick overhead Did you use spray tack to hold it all up there or lay it all on the plastic bag and lift it up as a stack?
Location: Florida wow, that must have been a real ***** getting 25 layers up there! Location: Duluth, Minnesota Thanks guys, yes it was a challenge getting the stack in place but compared to doing it layer at a time wet, a breeze. Location: Gold Coast Australia Hi All - the results for the compression tests are in. When the resin line opens, there is an open pathway of very low resistance between the resin bucket directly into and under the bag via the feed line. After the front passes, i dont profess to know all the dynamics involved, however i often observe voids forming above the flow media after clamping the feed - afterwhich, the dynamics change again.
Hi Groper - this is not my observation - my observation is that the laminate stack gets thinner as the resin front passes. In a correctly built infusion bag the laminate springback is purely an internal force in the system and does not affect the flow process.
Location: australia Well some of the great minds postulate that it is also caused by the spring pressure differential. Additionally, Apparently the gas expansion is not linear, but more so, so presents as a rather large problem. Now back to the real world, a combination of details, can minimise the growth of the voids and is how a practical infusion worker minimises the negative effects.
Location: Gold Coast Australia Hi Groper - do you want to do it in carbon or glass?
Location: Gold Coast Australia Lavender have a long gel time infusion epoxy, and Ironbark Composites have a very, very long gel time epoxy (24hrs plus from memory).
Working with NidaCore (Plascore) panels and Nida Core Bonding compound » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Infusing Panels and Ribs at same time? We had a guy helping chase down the leaks and he was very patient with the leak detector, we are finally getting used to the thing.


The boat owner and crew made a plywood box the size of the repair perimeter and filled it with spray foam to make a rough female mold of the bottom, then carved out space for the plumbing. The infusion discussion has touched upon the issue of springback quite a bit so I have asked a lab to do some compression tests on dry laminate stacks to establish the internal pressure due to the springback.
Thus you have full atmospheric pressure under the bag at this time - which is the force pushing the resin in. My current explanation for this is that the resin lubricates the stack and it compresses a small amount.
That is, after the resin enters the bag, the dissolved gasses are at atmospheric plus spring pressure. If the vac is kept at 100%, The laminate will start to compress and get thinner provided the entire system is still flexible.
ATL are the only place I know of where to get this type of resin, is there anywhere else in aus? This was used to tailor the glass stack which was then removed, we then installed the consumables and then the stack reinstalled, we then offered it up to the boat, sealed the bag and pulled a vacuum. A way to think of this is that if we put the stack into a press to create the part shape the press would compress the stack but it would not be able to springback. If we assume a spring pressure of 150mbar, then what this means is that the dissolved gasses are at 1150mbar absolute (sea level infusion). Others switch off the vacuum and clamp both ends, yet still others reduce vacuum to ~85% at the time of clamping to eliminate the differential pressure. If it suddenly drops then holds just below the water vapour temp for that pressure, then you still have moisture in the stack and you should keep the vac on for longer before trying again to get rid of the moisture. We could then remove the mold and then spent a lot of manipulating the stack inside the bag under low vacuum.
From testing many types of laminates over the years I know that when we infuse csm and multiaxials we & others get 30% resin by weight very regularly.
Therefore, you need to SUM the 2 pressures inside the bag, combine the other dynamic effects, and you will get a NET INCREASE in preform thickness at this time (when the resin front reaches the location we are considering). My conditions usually Need about an hour on vac to get rid of all the moisture accumulated in a fairly clean new materials job. This was really the biggest problem we had as with that many layers when you think you have it looking good then up the vacuum and compress the stack it all changes, ultimately though we got it pretty good and had no bridging in the sump root area. There are other bubbles that cannot due to being mechanically trapped, and still other gasses that are still in solution. As it thins out, the pressure inside the bag changes from 1150mbar down to 1000mbar, and equilibrium is established on both sides of the bag. We did run 2 rows of mastic around the perimeter but not that far apart,and tried to leave a little slack in the bag between but I will have to try your method Peter, it sounds like a good plan. The aim of the test was to determine if the mechanical pressure agrees with atmospheric pressure thicknesses and if the stack is compressed multiple times what happens.


During this equalisation, the absolute pressure drops, therefore any remaining gasses will expand. All threaded fittings are sealed with Teflon tape and thread sealant but for the penetrations into the bag we used mastic and in some we kept adding as we chased down leaks. There were a couple of teething problems with the test because I asked the company owner to do it and he instructed a tech and in the translation I didn't get exactly what I wanted the first time around. A typical mast laminate can range from equal to AL in stiffness (70GPa) to say 90GPa using std modulus.
So the stacks have been compressed 6 times not 3 but I think it establishes what I expected to occur. Provided the resin is not locked, the expanding air pushes the resin further still, but we now have larger voids in our laminate compared to before clamping. There are a couple of changes I would like to implement in our process, first will be to use an absolute pressure gauge for setting up the bag and I would like to transition into working in only metric.
Could you guys please lead me through exactly how you use the gauge as while ive seen lots of reference to them on forum threads ive never seen anyone explain how its used.
German advance composites who i will be buying it from say its only used in the feed line for setting up the bag but I thought vacmobile plumb it into the resin trap manifold but im not sure about this.
The laminate clearly gets stiffer at about 1.5bar but we can't apply that sort of pressure with infusion (the test ran to the equivalent of 3bar). Since you are doing very good infusions I'd expect you can get 35Gpa from a glass laminate.
The second and third were very similiar indicating that the mechanical bedding in may be at max.
But since the Al mast is usually designed at SF=3+ but the glass mast is 3x stronger then you can build a glass mast much lighter then the alum mast but not as light as the CF. After 3 load cycles if we apply 1bar pressure to the stack it results in a thickness equivalent of 25% resin by weight, which by experience is the lowest resin content acheivable using VIP. So if you either let the vacuum bed the stack down or encourage the stack to get thinner with a roller for instance 30-35% is the usual resin weight average and some form of debulk will get you 25-30% Rw. If you get some S2 glass then you can build a 45Gpa laminate and it will be very light and cheap compared to aluminium, but again not as light as the CF (but much cheaper) So since you are building a mould you could do a glass one as a trial then graduate to carbon as the ultimate?
The perimeter also clamps the bag down stopping membrane action in the bag helping a little bit more.



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