guides and milling machine, and the boxes came out.
i used future us boxes.
this is the build method recommended by the retailer manufacturer.
as also seen on this video.
https://youtu.be/0tehU7h0Vbk
Wow that's next level in terms of skills for a DIY board! Great job!BalsaMichel wrote: ↑Sun Jul 25, 2021 5:40 pmMay I post this here although the board is 1.2m long? Maybe on the upper edge of pocketboards, but 78cm when I take the nose off .
Idea was to move the splitline as much as possible to the tip to get less strain on the split and a long base for UD reinforcement between split and foil mount.
9.5mm Balsa core and 15mm thickness in the stringer sections. Shells are just 300g/m² carbon triax as 70% of the lenghtwise stiffness comes from the UD fibre anyway. Edges (yellow) and connection profiles (grey) 3D-printed with PETG, anti slip patches printed with TPU. Stiffness of the foil section is really good, the nose might need some more UD carbon on both sides of the splitline.
Thinking already about a simplified version in Paulownia + Carbon without edges and anti slip pads.
Please don´t ask for the sense of splitting 1.2m boards, my press and CNC are only 0.9m long, I had no choice anyway
Micha
...Edit: Have been told this looks like a hybrid of a giraffe and a banana
Went with basalt double uni strips on the deck then a layer of biax for foot area, and 0-90 to finish. Bottom double uni around the box but none to the nose, then just single 0-90.Banjokite wrote: ↑Sun Apr 11, 2021 3:39 amHi Builders, I’m part way through a solid balsa core board, its 90x41x3cm before shaping the rails and nose (pictured), the centre area has 3 layers - 0 degrees, 45 degrees and 45 degrees, then two lengths of 0 degrees Along the rails (this design is because I have used scrap wood of different thicknesses, and only hand saw tools).
The current weight of the balsa core only is 1.8kg, which I think would put the density of this particular balsa wood towards the stronger end of the range of Balsa densities (though this includes the weight of the PVA glue and I could tell from cutting it that some of it was less dense than other parts).
I have 4 ounce single bias Basalt fibre cloth, 4.5 ounce double bias basalt cloth, and 75mm uni basalt cloth for the lay up.
Interested in advice for the lamination schedule for the least extra weight to achieve the necessary strength and stiffness. 85kg rider, free ride foiling.
I’ll be looking to use big head inserts for the foil mounting, with chopped fibre 20mm drill-outs between the hull and deck.
Possibly might use exposed 2mm cork deck pads. I know this won’t be the most efficient material combination for weight-saving instead of foam/carbon, but this an eco build orientation so the gains in other areas are relevant.
Cheers- Banjo54A6E8FE-4A51-448D-B36F-60939180CCDC.jpeg5C09A819-1088-4D60-AF8B-C59575FA8984.jpeg
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