Hi to everyone
Have project boat, which is 21' ski boat, which previous had out board, and then someone cut it for inboard setup. I'm looking to out Chev BB and surface drive.
Therefore filling holes and cut out in transom which appears to be in good condition, 2.75" thick
Have drilled some holes from top of outer stringers which are 10x2" and they seem to be in reasonable condition judging from the colour of the timber
However started to cut out of section of centre stringer which is 5.5x2" as this needs to be removed from back of transom as this is where the surface drive will come through, and found it completely rotted out
Drilled down from top to check how far rot extends back, and looks to be 6' which leaves only 3' fro remainder of centre stringer to bulk head
I phoned local boat builder and explained situation on phone, who advised that they would cut the top of the stringer off, dig out rotten wood and fill with resin/talc mix. Basically cast new stringer. Im assuming this is what they would do to save time
However Im not sure to do this or replace the stringer with sandwich marine ply 0.7" thick (18mm) x 3 strips. I measured the glass skin on existing centre stringer and looks to be 3mm (0.120")
I have 900oz and 600oz Biaxial fibreglass cloth here, and was going to use West resin 105
Can I ask the experts is it better to cast new centre stringer, or cut out and replace new stringer with sandwich marine ply or PVC/Bamboo composite called corelight which appears to be water proof (just concerned whether fibreglass will take to it, although description indicates good gluing properties)
I was going to look at reinforcing back of stringers and transom with additional 900oz cloth
cheers
Have project boat, which is 21' ski boat, which previous had out board, and then someone cut it for inboard setup. I'm looking to out Chev BB and surface drive.
Therefore filling holes and cut out in transom which appears to be in good condition, 2.75" thick
Have drilled some holes from top of outer stringers which are 10x2" and they seem to be in reasonable condition judging from the colour of the timber
However started to cut out of section of centre stringer which is 5.5x2" as this needs to be removed from back of transom as this is where the surface drive will come through, and found it completely rotted out
Drilled down from top to check how far rot extends back, and looks to be 6' which leaves only 3' fro remainder of centre stringer to bulk head
I phoned local boat builder and explained situation on phone, who advised that they would cut the top of the stringer off, dig out rotten wood and fill with resin/talc mix. Basically cast new stringer. Im assuming this is what they would do to save time
However Im not sure to do this or replace the stringer with sandwich marine ply 0.7" thick (18mm) x 3 strips. I measured the glass skin on existing centre stringer and looks to be 3mm (0.120")
I have 900oz and 600oz Biaxial fibreglass cloth here, and was going to use West resin 105
Can I ask the experts is it better to cast new centre stringer, or cut out and replace new stringer with sandwich marine ply or PVC/Bamboo composite called corelight which appears to be water proof (just concerned whether fibreglass will take to it, although description indicates good gluing properties)
I was going to look at reinforcing back of stringers and transom with additional 900oz cloth
cheers