It's taken a ridiculous amount of time (for me anyway) to get the keel case in place. Numerous options on how to build it and even who to build it have crossed my mind. Finally a couple of weeks ago a friend of ours who is a marine architect; Scott Murphy of Oceanic ..design and survey ( http://www.oceanicdesign.com.au/) told me what materials to use to make the case. If the case ever fails it will be my fault.
The keel blade has had nylon screwed to the top sides and will slide inside two marine grade aluminum channel sections 80x40x4 bolted into the end plates which have been drilled filled and re-drilled to make sure there is no water to worry about ever!
The inside of the end plates of the case have two layers of 45deg 450db and three layers of 90deg 600db fibreglass while the sides of the case have two layers of 45deg 450db.
The outside has three layers of 450db on the ends and two layers of the same on the sides, plus the whole lot has been wrapped in one layer of 200gsm cloth to make the end result pretty!
The ends are 18mm ply (specified was 6 with 5 layers of 450, so I have made it stronger than necessary) and the sides are 6mm as specified with the inside and outside getting a couple less layers than specified.
The case has been structurally epoxy bogged in place and then two layers of 450db have been laid on the top and bottom to tie the case into the hull.
After finishing this job over the last week or two I finished it in today (day off work...lucky me) and then glassed the deck with 200gsm cloth. This weekend I will finish off the cockpit area with cloth and start on the foot bensons.
The keel blade has had nylon screwed to the top sides and will slide inside two marine grade aluminum channel sections 80x40x4 bolted into the end plates which have been drilled filled and re-drilled to make sure there is no water to worry about ever!
The inside of the end plates of the case have two layers of 45deg 450db and three layers of 90deg 600db fibreglass while the sides of the case have two layers of 45deg 450db.
The outside has three layers of 450db on the ends and two layers of the same on the sides, plus the whole lot has been wrapped in one layer of 200gsm cloth to make the end result pretty!
The ends are 18mm ply (specified was 6 with 5 layers of 450, so I have made it stronger than necessary) and the sides are 6mm as specified with the inside and outside getting a couple less layers than specified.
The case has been structurally epoxy bogged in place and then two layers of 450db have been laid on the top and bottom to tie the case into the hull.
After finishing this job over the last week or two I finished it in today (day off work...lucky me) and then glassed the deck with 200gsm cloth. This weekend I will finish off the cockpit area with cloth and start on the foot bensons.
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