Rocker?????

[Telemark Mark]

Quick ? for you guys. I'm building a mold for a rockered tipped ski. I'm gonna start the rocker about 35cm (back of tip) and continue to about a 60mm tip height.

Should I design excess rocker height (in the mold) to allow for the finished ski's rocker to "settle" a bit. I've been adding an extra 10mm of camber to my mold and they settle in fine............don't know about rocker though.

I've seen that jlutz05 and plywood had the discussion earlier.....and it seems they agreed to add an extra 5mm of rocker into the mold design. Any thoughts?

[knightsofnii]

what side are you heating from?

when i heated from top, i end up with less camber than the mold has,
when heat from underneath, i end up with more.

so it will make a difference which way you want to compensate, unless you're heating both sides?

[Telemark Mark]

I'm not using heat at all. I'm vacuum bagging for 15 hrs. I'd like to be able to speed up the cure time............but I've had good luck so far with the "long" way, and my demand isn't that high yet.

I've made a few skis with 8mm of camber in them. The mold for these skis has 18mm built into it. Seems the skis settle about 10mm after I pull them out of the mold. I'm thinking that 5mm added to the rocker part of the mold would be about right. The core is about half as thick where the rocker starts............so should settle about half the distance??????

[MontuckyMadman]

The core is about half as thick where the rocker starts

I'm confused. Do you mean it's half as thick as its thickest point? or it tapers dramatically where the rocker starts?

[Telemark Mark]

My rocker starts about 35cm back of tip. My core thickness at this point is 4.5-ish mm thick. That's about half as thick as my thickest point (9-10mm -ish).

Hope that makes sense.

[MontuckyMadman]

Yes that makes sense.
The only skis I have made, pneumatic press at 50 psi, I have noticed no change in rocker or camber they still fit the mold. If its 5mm I wouldn't care however.