tunnels
01-20-2017, 09:47 PM
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Who said it cant be done ?? where there's a will there is a way! Took all of 5 minutes of thinking to solve this problem ! Heating was impossible and 3 people had already tried and walked away shaking there heads ! so cutting part way through was the answer but how much to leave that was the question , we did not want print through onto the shiny gel coated finish out side and with a very thin glass skin !
This was similar to another job I had done a couple of years before so cut a sample and wrapped right in the bow where the tightest radius was and behold it worked !! with the cut inside they closed up but gave us channels for the resin to fill and there was no visible cut inside once the peel ply was removed ! the first hull was the trickiest getting a methods sorted and after that it was a breeze !
Photo 3 shows what had to be cut port and starboard for each boat ! It was such a tight area to work inside of only one person as able to fit !
Photo 4 shows the base adapted to angle grinder to give the right depth and the guide for each cut ! The width if the actual teeth on the saw blade was another key to making it work ,The finer the cuts the more had to be made !!,with the 18 MM hi density foam getting the right depth was another factor to making this work properly and allowing the foam to bend and not break so we settled on just 4 mm of uncut foam at the bottom the groove ! The cuts at bow end were close together and as the radius increased so the spacing of each cut increased as well !
As can be seen in photo 2 whole sheets had to be cut similar to achieve a nice gentle bend ! Hi density foam was only used in the hi stress area and above the waterline the density dropped to H65 and the thickness went down to 15 mm These hulls had just one skin of 0/90- 600 gram each side but continuous strand 400 mm wide unidirectional glass was laid only where rigging would be putting huge strain on the hull ! under the core in strategic places and over the top of the core before the inner skin was laminated .
Who said it cant be done ?? where there's a will there is a way! Took all of 5 minutes of thinking to solve this problem ! Heating was impossible and 3 people had already tried and walked away shaking there heads ! so cutting part way through was the answer but how much to leave that was the question , we did not want print through onto the shiny gel coated finish out side and with a very thin glass skin !
This was similar to another job I had done a couple of years before so cut a sample and wrapped right in the bow where the tightest radius was and behold it worked !! with the cut inside they closed up but gave us channels for the resin to fill and there was no visible cut inside once the peel ply was removed ! the first hull was the trickiest getting a methods sorted and after that it was a breeze !
Photo 3 shows what had to be cut port and starboard for each boat ! It was such a tight area to work inside of only one person as able to fit !
Photo 4 shows the base adapted to angle grinder to give the right depth and the guide for each cut ! The width if the actual teeth on the saw blade was another key to making it work ,The finer the cuts the more had to be made !!,with the 18 MM hi density foam getting the right depth was another factor to making this work properly and allowing the foam to bend and not break so we settled on just 4 mm of uncut foam at the bottom the groove ! The cuts at bow end were close together and as the radius increased so the spacing of each cut increased as well !
As can be seen in photo 2 whole sheets had to be cut similar to achieve a nice gentle bend ! Hi density foam was only used in the hi stress area and above the waterline the density dropped to H65 and the thickness went down to 15 mm These hulls had just one skin of 0/90- 600 gram each side but continuous strand 400 mm wide unidirectional glass was laid only where rigging would be putting huge strain on the hull ! under the core in strategic places and over the top of the core before the inner skin was laminated .