We then draped the 160 g/sq.m.FG on the side and cut it to size with scissors
and then wetted out the FG in place with about 600 grams of epoxy spread out with a roller.
Total work time to date: 438 hours
Diary on the construction of a Seaclipper 20, a plywood trimaran designed by Jim Brown and John Marples. Our boat's Sail No. is 50. The boat has been named GEODETICA and was launched on september 28th, 2024.
Sunday, June 19, 2016
Fiberglassing the amas (1)
Three hours to fiberglass one side of the first ama. We first sanded the side with 120 grit on the rotoorbital, in particular to feather the edge of the bottom fiberglass but also to take down drips and the like.
We then draped the 160 g/sq.m.FG on the side and cut it to size with scissors
and then wetted out the FG in place with about 600 grams of epoxy spread out with a roller.
Total work time to date: 438 hours
We then draped the 160 g/sq.m.FG on the side and cut it to size with scissors
and then wetted out the FG in place with about 600 grams of epoxy spread out with a roller.
Total work time to date: 438 hours
Sunday, June 12, 2016
Rudder (1)
Three hours of work this week end. We finished the daggerboard (which is now ready for fiberglassing) and continued working on the rudder blade, which has a particular shape. Here it is:
After cutting the laminated plank to shape I started to use the power plane to give the blade a NACA profile. Here's how it looks now
Total work time to date: 435 hours
After cutting the laminated plank to shape I started to use the power plane to give the blade a NACA profile. Here's how it looks now
Total work time to date: 435 hours
Sunday, June 5, 2016
More pics of the blades
Two more pics of the appendages as they look now. First is the daggerboard, almost ready for glassing and finish. This is a big and heavy daggerboard by the way: about 120 x 40 cm, 3.5 cm thick.
This is the rudder stock, which will have to be cut to shape, with the "NACA grooves" cut on both sides of the blade, ready for planing.
This is the rudder stock, which will have to be cut to shape, with the "NACA grooves" cut on both sides of the blade, ready for planing.
Shaping the appendages
Six hours of work between friday and saturday. At the end we have decided to cover everything with fiberglass so we had to order some more which has not arrived yet. Hence, this week end we worked mostly on the appendages (daggerboard and rudder blades).
Both are based on NACA profiles, based on which I cut guide grooves with the circular saw that I used as a guide to give the blade a proper shape, using the power planer, the orbital sander with a 40 grit disc, surforms and sanding pads. Here we are after a while
Total work time to date: 432 hours
Both are based on NACA profiles, based on which I cut guide grooves with the circular saw that I used as a guide to give the blade a proper shape, using the power planer, the orbital sander with a 40 grit disc, surforms and sanding pads. Here we are after a while
This is hard work, and produces a mountain of sawdust. The nice thing is that one can use the plywood layers like interference fringes in optical surface figuring :-)
Next pic shows Cinzia in the background finishing the daggerboard while the rudder blade is on the sawhorses.
Here are the NACA profile depths for the rudder blade
Total work time to date: 432 hours
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