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If wood core. Then go 10mm core with 2.5mm carbon each side for 15mm out thickness. 120mm. uni at 0, 15 and several matt layers at 45's. Fillet to at least 18mm at base plate and make a one peice fuse/mast.

Pretty sure that won't break. PS carbon does not have plastic deformation at all. It will elastically bend and bounce back. Past that you will get catastrophic failure.

Pss search plummeted hammerhead foil. You will get and idea of what I'm talking about re the lay up and filleting.

patrelsa wrote: ↑

Sat Dec 30, 2017 3:42 am

thank you for your suggestions .....i will use wood core instead......im 120 kilos carving very hard into wave face in 25 knots of wind with alot of speed on a 4 meter kite putting alot of leverage on the wings and mast.....and i can bend them quite easily both liquid force and slingshot....but they were all warranteed....

That makes sense then, yes

The idea of contacting a brand that makes windfoil gear, as mentioned here, could be an idea maybe as they are usually stronger in general, stronger connection points at least.

Eventhough I dont know about the masts themselves, but you could ask ?

Seems you need an extra strong one, with your hardcore riding

PF

If you build your own mast, I suggest you consider just using a foam core which is lighter. Or use very light wood like balsa wood. The core of your mast (or any beam) does not provide much strength.. all the strength is nearer the surface of the mast. I know some commercial foil brands use foam cores in their masts or wings to keep the weight down.

:-;
CG

For someone who is stressing things more than most people, if you were to go with a foam core at very least you'd want a really good hardwood or carbon stringer in the centre. If the foam can compress you can start to have your cross-section thickness reduce, which then allows more bending than if it stayed at full thickness. That could lead to trouble....

Peter