Best wide ski core thickness profile
Posted: Thu Oct 23, 2008 11:35 am
Hi there. I just joined this fabulous site. I am working with John Hadley and his after school kids shop club helping them make skies and snowboards.
I’m learning as I go on my first pair of skies. They are to be somewhat likened to the BD Megawatt, that is 188 overall, 153-125-130, a consistent tip rocker arc starting back about 16 inches from the tip. Minor tail twin-tippage. Hopefully fairly stiff in the body and tail with soft rocker tip. I weigh in at ~200. I intend to mount alpine binders (some rental tyrolias with lots of fore and aft adjustment) and only use them for in-bounds powder.
As John has done previously done, the layup will consist of:
Base and edges
Rubber tape dampeners
22 oz. triax
Core (poplar and ash) w/ small 3mm tip and tail spacers
22 oz. triax
Some laser printed graphics on rice paper
No top sheet
Pressed in a heated vacuum bag.
Coat edges with epoxy.
My first questions is: what should the core profile look like? As this ski is so wide, I assume the thickness must be considerably less than that of a ski 88mm under the foot.
From reading on the site it seems like 2-2.5 mm in the tip and tail would be good. My tip will start about 16 inches back and slowly curve up to about 7-10 cm. Maybe a tiny kicker at the tip.
For the body (under boot flat area), I was previously thinking 10mm, but I saw teleman36 suggest to telexis that 6.5-7mm would be better for a ski that wide. That seems really thin, but then hey, I’ve never done this before.
So, given my preferences and beer gut, what profile would you folks recommend?
Thanks in advance,
Jim
I’m learning as I go on my first pair of skies. They are to be somewhat likened to the BD Megawatt, that is 188 overall, 153-125-130, a consistent tip rocker arc starting back about 16 inches from the tip. Minor tail twin-tippage. Hopefully fairly stiff in the body and tail with soft rocker tip. I weigh in at ~200. I intend to mount alpine binders (some rental tyrolias with lots of fore and aft adjustment) and only use them for in-bounds powder.
As John has done previously done, the layup will consist of:
Base and edges
Rubber tape dampeners
22 oz. triax
Core (poplar and ash) w/ small 3mm tip and tail spacers
22 oz. triax
Some laser printed graphics on rice paper
No top sheet
Pressed in a heated vacuum bag.
Coat edges with epoxy.
My first questions is: what should the core profile look like? As this ski is so wide, I assume the thickness must be considerably less than that of a ski 88mm under the foot.
From reading on the site it seems like 2-2.5 mm in the tip and tail would be good. My tip will start about 16 inches back and slowly curve up to about 7-10 cm. Maybe a tiny kicker at the tip.
For the body (under boot flat area), I was previously thinking 10mm, but I saw teleman36 suggest to telexis that 6.5-7mm would be better for a ski that wide. That seems really thin, but then hey, I’ve never done this before.
So, given my preferences and beer gut, what profile would you folks recommend?
Thanks in advance,
Jim