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#1
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vacuum bagging hull
There is no technical reason why it cannot be done.There is however a need
for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? |
#2
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vacuum bagging hull
I am unclear as well. What are you trying to do?
"Courtney Thomas,,," wrote in message ... John, Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? |
#3
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vacuum bagging hull
John,
Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? |
#4
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vacuum bagging hull
Did you read my post in the original thread? You will never have enough
time to bag a 40' hull with polyester. You do not have enough open time. Epoxy and properly aligned uni and bidirectiona E-glass will be stronger, lighter and give plenty of time for a crew of 6 people to lay two plys on a 40' hull. We were very well organized with all the right tools when we bagged my 45' hull and it still took 6 hours to lay the glass and another hour to set the peelply,breather and bag and another 30 minutes pull the bag. Polyester will give you two hours at most IF you can control the catalyst very closely and keep the temperature in the low 60s. If you are worried about the extra cost of epoxy you better start thinking about a smaller boat because what you will save with polyester on the hull glass is an infinitesimally small part of what you are about to spend. Courtney Thomas,,, wrote: John, Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#5
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vacuum bagging hull
Glenn Ashmore wrote in message news:B7PEb.8520$JD6.5798@lakeread04...
Did you read my post in the original thread? You will never have enough time to bag a 40' hull with polyester. You do not have enough open time. Epoxy and properly aligned uni and bidirectiona E-glass will be stronger, lighter and give plenty of time for a crew of 6 people to lay two plys on a 40' hull. We were very well organized with all the right tools when we bagged my 45' hull and it still took 6 hours to lay the glass and another hour to set the peelply,breather and bag and another 30 minutes pull the bag. Polyester will give you two hours at most IF you can control the catalyst very closely and keep the temperature in the low 60s. If you are worried about the extra cost of epoxy you better start thinking about a smaller boat because what you will save with polyester on the hull glass is an infinitesimally small part of what you are about to spend. Hey Glenn, how would you like to pay for some of that boat? Depending on where you are, you should do a seminar on vacume bagging large hulls, bulkheads, etc. You could charge $X a day, I know if you were close enough, I would come. Scotty I am kinda' joking here, but kinda' not. Courtney Thomas,,, wrote: John, Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? |
#6
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vacuum bagging hull
Scotty says:
I am kinda' joking here, but kinda' not. Story of your life, Scotty? ;-) |
#7
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vacuum bagging hull
To Glenn:
1-My original post was regarding EPOXY resin, not polyester. 2-If I understand you, all I've read says..... the opposite of your contention, i.e. that E-glass is best. S-glass is way stronger than E-glass. 3-Again, I'm not talking about your suggestion of multiple layers, but rather a compound 'mat' having all three of the triaxial layers in one layup. 4-I've said nothing about the cost of epoxy in my posting. I don't know to what you are referring here. 5-I can't think about a smaller boat 'cause I'm talking about relaminating an existing one. Apparently I did a foul job in my original post. Thanks for input on this matter from all readers ! Courtney Glenn Ashmore wrote: Did you read my post in the original thread? You will never have enough time to bag a 40' hull with polyester. You do not have enough open time. Epoxy and properly aligned uni and bidirectiona E-glass will be stronger, lighter and give plenty of time for a crew of 6 people to lay two plys on a 40' hull. We were very well organized with all the right tools when we bagged my 45' hull and it still took 6 hours to lay the glass and another hour to set the peelply,breather and bag and another 30 minutes pull the bag. Polyester will give you two hours at most IF you can control the catalyst very closely and keep the temperature in the low 60s. If you are worried about the extra cost of epoxy you better start thinking about a smaller boat because what you will save with polyester on the hull glass is an infinitesimally small part of what you are about to spend. Courtney Thomas,,, wrote: John, Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? -- Courtney Thomas s/v Mutiny lying Oriental, NC WDB5619 |
#8
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vacuum bagging hull
Courtney Thomas wrote: To Glenn: 1-My original post was regarding EPOXY resin, not polyester. Sorry. Your original post that I replied to concerned polyester. You did not make much distinction about the change of resins in your second thread. 2-If I understand you, all I've read says..... the opposite of your contention, i.e. that E-glass is best. S-glass is way stronger than E-glass. S-glass is considerably stronger than E-glass but the price does not justify the difference. 3-Again, I'm not talking about your suggestion of multiple layers, but rather a compound 'mat' having all three of the triaxial layers in one layup. YOu need to be concerned with the learning curve and getting the team adjusted to working together. I'll give you an idea of how our lay-up went. We had two layers of uni-directional to be laid at 45º either way from vertical to lay. We laid 3 runs of the first layer and then the first run of the second. Then we kept the first layer two runs ahead of the second. The first 20' took about 4 hours with one person mixing resin, two wetting out and 3 or 4 laying. The last 25' took about 2 hours because we all got the hang of it and refined the process. Triaxial will be a lot harder to wet out and handle. While you will have less than half as much yardage to lay I would not expect that you will be able to do it in much more than a couple of hours less. 4-I've said nothing about the cost of epoxy in my posting. I don't know to what you are referring here. You were talking polyester 24 hours before. 5-I can't think about a smaller boat 'cause I'm talking about relaminating an existing one. You are asking for trouble. Apparently I did a foul job in my original post. Yes. Thanks for input on this matter from all readers ! Courtney Glenn Ashmore wrote: Did you read my post in the original thread? You will never have enough time to bag a 40' hull with polyester. You do not have enough open time. Epoxy and properly aligned uni and bidirectiona E-glass will be stronger, lighter and give plenty of time for a crew of 6 people to lay two plys on a 40' hull. We were very well organized with all the right tools when we bagged my 45' hull and it still took 6 hours to lay the glass and another hour to set the peelply,breather and bag and another 30 minutes pull the bag. Polyester will give you two hours at most IF you can control the catalyst very closely and keep the temperature in the low 60s. If you are worried about the extra cost of epoxy you better start thinking about a smaller boat because what you will save with polyester on the hull glass is an infinitesimally small part of what you are about to spend. Courtney Thomas,,, wrote: John, Thank you for your reply, but you are repeating my questions :-) The hull is 40' LOA. No I don't have any experience doing this....that's why I'm posting the query. I'm confused as to why you are unclear of the motive, ostensibly knowing the difference between E-glass/polyester resin and S-glass/epoxy. Anyway, have you any related experience/knowledge of such an undertaking ? Cordially, Courtney John Meachen wrote: There is no technical reason why it cannot be done.There is however a need for enough people to cope with the job.It would be useful to know how big the hull in question is. Ther is also the question of why you would mix E-glass and polyester with S-glass and epoxy.Have you any experience of either combination? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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