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Author Topic:   Laminate Thickness at Keel

H2obio posted 09-03-2013 09:50 PM ET (US)
Hi all. How thick is the fiberglass in the keel area [of a] 1979 [Boston Whaler REVENGE 21]? [My boat hull has] a couple of areas of separation. I'm not sure if I need to just fill or do a full fiberglass job. Thanks!
jimh posted 09-04-2013 08:31 AM ET (US)
For advice on how to make repairs to areas of damage of the Unibond hull of a Boston Whaler boat, please see
http://continuouswave.com/whaler/reference/repairInstructions.html
which reproduces the factory repair instructions.
andygere posted 09-04-2013 05:42 PM ET (US)
This photo shows the thickness of the hull of my 1989 Outrage 22. The sample is from an area on the bottom of the hull about a foot away from the keel. Not exactly what you are looking for, but it may give you a general idea of how these hulls are constructed.
http://img.photobucket.com/albums/v408/andygere/Whaler%20details/ Outerhullskin.jpg
sjp2 posted 09-05-2013 06:01 AM ET (US)
well this might not be too too relevant to your size of boat either but when i put a slice up the keel of my 13 footer ,about 8 ft,i found the glass was the same thickness as the hull ,about a 1/4 of an inch,the strength i guess is in the U shape ,i have since glassed the U shape of the keel with fibreglass mash and about 3 layers of mat,now i can truly say that its the strongest part of the boat ,this fix was caused by a 6 "tear in the keel while i was winching it back on the trailer,guess iam too used to aluminum boats ,as this i my first fibreglass one .
H2obio posted 09-05-2013 08:37 PM ET (US)
Thanks all!
Binkster posted 09-05-2013 09:22 PM ET (US)
one layer of 3/4oz glass followed by 3 layers of 1 1/2oz mat will make a laminate about 3/16" thick. If you want to build up thickness quickly add a layer of woven roving between the layers of mat or use fab-mat.
rich
Binkster posted 09-05-2013 09:24 PM ET (US)
Should read one layer of 3/4 oz Mat, not "glass".
sjp2 posted 09-06-2013 06:35 AM ET (US)
sorry but the specs and techs i am not too familiar with but my process was as follows -i cut a 1/4 inch wide gap along the keel for about 8 feet or more (using a borrowed moisture meter from a fibre glass friend ,it showed a off the scale reading all along the keel ,so with 2 weeks in the sun and the cut i hoped it would dry out a bit )the foam was dug out as per whaler fix instructions in the keel and along the edges ,this was stuffed with mash and then tightly rolled coils of resin soaked cloth(now i am getting the terms right) to get the dome shaped profile pushed into the cut,this i then covered with 3 layers of cloth,with some mat in between.
my problem is similar in most of my projects -with welding its excessive use of the grinder to get rid of too much weld and with fiber glassing is sanding to get rid of excess fiberglass.

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Author	Topic: Laminate Thickness at Keel
H2obio	posted 09-03-2013 09:50 PM ET (US) Hi all. How thick is the fiberglass in the keel area [of a] 1979 [Boston Whaler REVENGE 21]? [My boat hull has] a couple of areas of separation. I'm not sure if I need to just fill or do a full fiberglass job. Thanks!
jimh	posted 09-04-2013 08:31 AM ET (US) For advice on how to make repairs to areas of damage of the Unibond hull of a Boston Whaler boat, please see http://continuouswave.com/whaler/reference/repairInstructions.html which reproduces the factory repair instructions.
andygere	posted 09-04-2013 05:42 PM ET (US) This photo shows the thickness of the hull of my 1989 Outrage 22. The sample is from an area on the bottom of the hull about a foot away from the keel. Not exactly what you are looking for, but it may give you a general idea of how these hulls are constructed. http://img.photobucket.com/albums/v408/andygere/Whaler%20details/ Outerhullskin.jpg
sjp2	posted 09-05-2013 06:01 AM ET (US) well this might not be too too relevant to your size of boat either but when i put a slice up the keel of my 13 footer ,about 8 ft,i found the glass was the same thickness as the hull ,about a 1/4 of an inch,the strength i guess is in the U shape ,i have since glassed the U shape of the keel with fibreglass mash and about 3 layers of mat,now i can truly say that its the strongest part of the boat ,this fix was caused by a 6 "tear in the keel while i was winching it back on the trailer,guess iam too used to aluminum boats ,as this i my first fibreglass one .
H2obio	posted 09-05-2013 08:37 PM ET (US) Thanks all!
Binkster	posted 09-05-2013 09:22 PM ET (US) one layer of 3/4oz glass followed by 3 layers of 1 1/2oz mat will make a laminate about 3/16" thick. If you want to build up thickness quickly add a layer of woven roving between the layers of mat or use fab-mat. rich
Binkster	posted 09-05-2013 09:24 PM ET (US) Should read one layer of 3/4 oz Mat, not "glass".
sjp2	posted 09-06-2013 06:35 AM ET (US) sorry but the specs and techs i am not too familiar with but my process was as follows -i cut a 1/4 inch wide gap along the keel for about 8 feet or more (using a borrowed moisture meter from a fibre glass friend ,it showed a off the scale reading all along the keel ,so with 2 weeks in the sun and the cut i hoped it would dry out a bit )the foam was dug out as per whaler fix instructions in the keel and along the edges ,this was stuffed with mash and then tightly rolled coils of resin soaked cloth(now i am getting the terms right) to get the dome shaped profile pushed into the cut,this i then covered with 3 layers of cloth,with some mat in between. my problem is similar in most of my projects -with welding its excessive use of the grinder to get rid of too much weld and with fiber glassing is sanding to get rid of excess fiberglass.