Ski Builders Forum

So you suggest:

Flax 350
UD carbon
BCore
UD carbon
Flax 350

Yes, that how I do it.

I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.

SleepingAwake wrote:I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.

Do you think this applies to triax glass as well?
So don't have the 0 degree fibre against the core?
Wouldn't there always be a big differential against the UD layer?

gav wa wrote:

SleepingAwake wrote:I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.

Do you think this applies to triax glass as well?
So don't have the 0 degree fibre against the core?
Wouldn't there always be a big differential against the UD layer?

In theory this applies to fiberglass as well, but as your average carbon fiber is around 3 times stiffer than glass fiber the problem is less pronounced.

Thanks for the info. I have been planning to make a set of foldable approach skis that aren't heavy and unreliable like mtn approach. I have some carbon ready to go but now i might add a bit of light glass between the core and carbon.
Cheers bro.