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by RalfsB
Mon Feb 20, 2017 3:41 pm
Forum: Hydrofoil Builders
Topic: Bomb proof board from XPs insulation foam
Replies: 56
Views: 3528

Re: Bomb proof board from XPs insulation foam

The board weighs in currently (with a fill coat on the bottom weave and rails) 1.8 kg I now need to glass the top with rail wraps down to bottom curve. Am thinking of 2x 6onz with a 4onz patch over mast mount. I feel that I have perhaps over built it but it is the first time I have used this foam a...
by RalfsB
Mon Feb 20, 2017 8:26 am
Forum: Hydrofoil Builders
Topic: Bomb proof board from XPs insulation foam
Replies: 56
Views: 3528

Re: Bomb proof board from XPs insulation foam

What is the weight of the board after glassing?
by RalfsB
Wed Feb 01, 2017 11:57 am
Forum: Hydrofoil Builders
Topic: Bomb proof board from XPs insulation foam
Replies: 56
Views: 3528

Re: Bomb proof board from XPs insulation foam

Woodie Cookie in the Netherlands, an ex-raceboard champ, board designer and now foil designer, has made some hollow raceboards. Can anyone think of a good reason why hollow boards wouldn't work for foils? Hollow boards do work for foils, I know that a local company Stradi Custom Boards built a batc...
by RalfsB
Thu Jan 12, 2017 8:12 am
Forum: Hydrofoil Builders
Topic: Bomb proof board from XPs insulation foam
Replies: 56
Views: 3528

Re: Bomb proof board from XPs insulation foam

Last winter I built my bombproof foilboard using the xps core (2 cm thick) and 3mm plywood on both sides plus wooden reinforcements inside. Works fine but is quite heavy.

foil-in-making.png
by RalfsB
Tue Jan 10, 2017 10:16 am
Forum: Kitesurfing
Topic: Line extensions, brands, lengths?
Replies: 5
Views: 594

Re: Line extensions, brands, lengths?

For light winds I am using 15m extensions on my 18m kite, that makes a significant difference.
by RalfsB
Mon Jan 09, 2017 11:19 am
Forum: Kitesurfing
Topic: Sector 60
Replies: 11
Views: 1103

Re: Sector 60

On Sector 54 I have M6 screws (6mm metric), thread length 20mm, screw head diameter 10mm (heads are the ones with the Phillips round-pan / mushroom shape), can't see the washer.
by RalfsB
Mon Jan 02, 2017 8:00 pm
Forum: Board Builders
Topic: Hydrofoil board layup
Replies: 14
Views: 1321

Re: Hydrofoil board layup

You may want to re-consider your core material. A closed cell pvc foam should virtually eliminate water uptake even if you do ding the skin. Useful for both rails and also the bolt through for the foil mount. To toughen up the rails you can just add a few layers of fiberglass tape. Either just plai...
by RalfsB
Fri Dec 23, 2016 9:00 am
Forum: Hydrofoil Builders
Topic: G10 wings DIY
Replies: 17
Views: 1757

Re: G10 wings DIY

Making wings is not really hard, if you have some experience with fiberglass and epoxy. I have never used a ready-made G10, usually make what I need on my own. The basic steps are as follows: Make a mold (make sure it is somewhat heat-resistant because epoxy heats up quite a bit when curing), cover ...
by RalfsB
Tue Oct 25, 2016 8:01 am
Forum: Board Builders
Topic: Surfboard deck softened, no cracks, what's the best way to repair it (change the foam or inject polyester resin)?
Replies: 4
Views: 502

Re: Surfboard deck softened, no cracks, what's the best way to repair it (change the foam or inject polyester resin)?

I would just glass it without cutting. Probably 2 layers of 200 gram fiberglass cloth in the stress areas.
by RalfsB
Fri Oct 21, 2016 12:43 pm
Forum: Board Builders
Topic: My first Alaia
Replies: 30
Views: 2607

Re: My first Alaia

Do you mask just the edge and sand the excess off along the top and bottom corner (it helps to have a sharp edge), or do you also mask a narrow area of the bottom and top surface? For an alaia I would mask right on the edge (or a sharp curve, whatever happens to be there) so that glassing and sandi...

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