JulianB
Super Anarchist
- Thread starter
- #661
Longy, there are locking brummels and sliding brummels, even though I know how to do even a blind locking brummel, I tend to use sliding ones because a) they tend not to slide, and b) they do load up the actual splice rather than the brummel, and that has to be a good thing. Anyway, regardless of that, I will continue to load up my splices and test them to 3 x operating load, and if I get breakages, I will refine my process and that may mean going to locking stitches, but until then, I'm happy with what I am doing.
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Saw this photo few days back, it's now my screen saver, it's displace the young girl in Copenhagen on a screaming reach in a 29er, both great shots. Love what they do with what I did.
If anyone thought there was no evolution in basic sailing then think again, even no foils, these kids are having fun and that's what its all about.
Makes the 3Di sails and all that work worthwhile.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Last few days have not been idle, boat is progressing further but the big movement has been making the fin.
Started probably 10 days ago, we laid up the laminate,
We decided to do it old school, so laid up the 2 1/2ve, wet, so each layer went down and was fully wet-ed out.
Initial layer was a sacrificial 100gm Glass, over the entire surface, then
2 x 330gm Basalt Twill 0/90° over the whole surface
1 x 330gm Basalt Twill 45/45° probably coming 1/2 way down the LE, tapering back probably 300mm down at the TE.
Then 9 x 300gm Basalt Unie 0 -> 10° So these unies are staggered in length.
You can see one of the off-axis ones, and they reduce in thickness and length as the layers increase.
But each layer was individually wet-ed out and "stretched" so to speak into the laminate.
We added extra load sheeding "triangles" you can easily see the one on the TE, also right at the top on the LE.
Then peel ply, Perforated plastic, and 2 x 600gm layer of CSM (as bleed cloth), then 80% vacuum.
1.4kgs of laminate (per side) and approx 1.25kgs of epoxy (per side)
First side took about 2 hrs, 2nd took 50 mins.
The mould at the top is over length in-case I need a longer board.
TE reinforcement and a internal layer of Twill just to hold the hold thing together.
This shot was taken yesterday prior to bonding all the peel ply has been removed and it has been sanding .
About 6 days ago we blew a core, 2nd attempt was good, 3kgs of Pu H160 expanding foam.
Prior to blowing the core, day laid in a stuck down with masking tape all the LE wraps, The spar laminate and the extra bits
Covered it all with "Oven Bake Grease paper" and then blew the core, you have about 90sec from mixing to a full blow.
We used ratchet straps to hold the mould together, see the last photo.
This is the core just prior to bonding the 2 1/2ves, down the bottom is the Bulb anchor.
Similar lift bar at the top, again strapped in with Unies.
That will get 2 wraps of Unie to hold it in place, those are M10 MT bolts into 20mm SS bar.
TE relief, you can see the imprint from the other side in the Blown core.
Darcy and Alex (behind) laying up the spar, LE joining wrap is also down, Using bog as foam filler then resin to wet out the Glass bi-axial.
Looking towards the tip, one layer the whole way, you can see the 2nd layer starting, and there is a 3rd +/-350mm of the keel line.
All at 45/45°,
So this is the basic layup, black is the outer layers of Twill.
Redish/brown is the unies, it's approx 4mm thick at the keel.
Then the inner black zig-zag is the spar lay-up that you see happening above.
Bit over 1.25m² in the spar laminate, each blade at the keel is 1.2mm thick, it's significant.
Moulds in the "curing position" LE down, the clamps are only there to hold the moulds together while maneuvering into "curing position".
We then start at the tip, and wind up the tension, on the ratchet straps, move upwards toward the top so the resin/slurry (quite thin) is moved upward both toward the TE and toward the top.
We did heat it to 65-70c and held that for 6 hrs.
When clamping for the Pu Blown, mould was horzontal and we drop the tip 10°, so the blow started at the tip and blew upwards.
GT holding the finished fin, 11kgs and even though it was less than 18hrs old, we did a 200kg tip bounce.
It moved maybe 20mm, bloody stiff. I probably have over-killed once again.
We have now detailed the board, done some filling, there will be extra cap and tip laminates.
Then the plan is to do the full ISO 220% loading before I get on the plane. (Which is 1 week tomorrow)
Rudder moulds come back this week, may get the laminate in before I go.
~~~~~~~~~~~~~~~~~~
Saw this photo few days back, it's now my screen saver, it's displace the young girl in Copenhagen on a screaming reach in a 29er, both great shots. Love what they do with what I did.
If anyone thought there was no evolution in basic sailing then think again, even no foils, these kids are having fun and that's what its all about.
Makes the 3Di sails and all that work worthwhile.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Last few days have not been idle, boat is progressing further but the big movement has been making the fin.
Started probably 10 days ago, we laid up the laminate,
We decided to do it old school, so laid up the 2 1/2ve, wet, so each layer went down and was fully wet-ed out.
Initial layer was a sacrificial 100gm Glass, over the entire surface, then
2 x 330gm Basalt Twill 0/90° over the whole surface
1 x 330gm Basalt Twill 45/45° probably coming 1/2 way down the LE, tapering back probably 300mm down at the TE.
Then 9 x 300gm Basalt Unie 0 -> 10° So these unies are staggered in length.
You can see one of the off-axis ones, and they reduce in thickness and length as the layers increase.
But each layer was individually wet-ed out and "stretched" so to speak into the laminate.
We added extra load sheeding "triangles" you can easily see the one on the TE, also right at the top on the LE.
Then peel ply, Perforated plastic, and 2 x 600gm layer of CSM (as bleed cloth), then 80% vacuum.
1.4kgs of laminate (per side) and approx 1.25kgs of epoxy (per side)
First side took about 2 hrs, 2nd took 50 mins.
The mould at the top is over length in-case I need a longer board.
TE reinforcement and a internal layer of Twill just to hold the hold thing together.
This shot was taken yesterday prior to bonding all the peel ply has been removed and it has been sanding .
About 6 days ago we blew a core, 2nd attempt was good, 3kgs of Pu H160 expanding foam.
Prior to blowing the core, day laid in a stuck down with masking tape all the LE wraps, The spar laminate and the extra bits
Covered it all with "Oven Bake Grease paper" and then blew the core, you have about 90sec from mixing to a full blow.
We used ratchet straps to hold the mould together, see the last photo.
This is the core just prior to bonding the 2 1/2ves, down the bottom is the Bulb anchor.
Similar lift bar at the top, again strapped in with Unies.
That will get 2 wraps of Unie to hold it in place, those are M10 MT bolts into 20mm SS bar.
TE relief, you can see the imprint from the other side in the Blown core.
Darcy and Alex (behind) laying up the spar, LE joining wrap is also down, Using bog as foam filler then resin to wet out the Glass bi-axial.
Looking towards the tip, one layer the whole way, you can see the 2nd layer starting, and there is a 3rd +/-350mm of the keel line.
All at 45/45°,
So this is the basic layup, black is the outer layers of Twill.
Redish/brown is the unies, it's approx 4mm thick at the keel.
Then the inner black zig-zag is the spar lay-up that you see happening above.
Bit over 1.25m² in the spar laminate, each blade at the keel is 1.2mm thick, it's significant.
Moulds in the "curing position" LE down, the clamps are only there to hold the moulds together while maneuvering into "curing position".
We then start at the tip, and wind up the tension, on the ratchet straps, move upwards toward the top so the resin/slurry (quite thin) is moved upward both toward the TE and toward the top.
We did heat it to 65-70c and held that for 6 hrs.
When clamping for the Pu Blown, mould was horzontal and we drop the tip 10°, so the blow started at the tip and blew upwards.
GT holding the finished fin, 11kgs and even though it was less than 18hrs old, we did a 200kg tip bounce.
It moved maybe 20mm, bloody stiff. I probably have over-killed once again.
We have now detailed the board, done some filling, there will be extra cap and tip laminates.
Then the plan is to do the full ISO 220% loading before I get on the plane. (Which is 1 week tomorrow)
Rudder moulds come back this week, may get the laminate in before I go.
