skywagon8a
MEMBER
SE Mass MA6
I'm not planning on hitting anything. Once upon a time I was given a set of damaged Federal? 2000 skis. The tunnel was buckled under the pedestal. Don't know what or how it hit.
This video https://vimeo.com/151403825 shows the bottoms of the Rosti skis. Notice the flat section under and just ahead of the tire. There is an upward curvature just behind the tire which is a big help. However the Rosti tire is on top of the ski. That section needs stiffness enough to avoid buckling. Easier to do with composites. The curved top section in addition to it's aerodynamics provides torsional strength to the entire ski, not bottom stiffness. My ski will have this in aluminum.
I have yet to hear what the bottom thickness is of a set of aluminum skis. Anyone? Retract bottoms (not the slide)? Frenchy used 6061-T6 x .100". The -T6 is harder and more resistant to impact damage than -T3. I have 2024-T3 x .090" which is why the plan is to double up the bottom with 2024-T3 x .040".
I can also eliminate the double layer by using cross angles to provide the stiffness on the flat section. Perhaps this would be a better idea eliminating the layer of .040"? There would be less labor forming compound shapes and less weight. Now upon further thought perhaps this is a better route to take? I'm not too concerned about the edges taking a bit of punishment where a few dings wouldn't be too troublesome.
There will be two parallel tunnels attached to and stiffening the bottom which transfer the loads to either side of the wheel axle attachment.
What do you abusers of skis in Alaska think? You mechanics who repair the damage? Dave Caulkins? mike mcs?
This video https://vimeo.com/151403825 shows the bottoms of the Rosti skis. Notice the flat section under and just ahead of the tire. There is an upward curvature just behind the tire which is a big help. However the Rosti tire is on top of the ski. That section needs stiffness enough to avoid buckling. Easier to do with composites. The curved top section in addition to it's aerodynamics provides torsional strength to the entire ski, not bottom stiffness. My ski will have this in aluminum.
I have yet to hear what the bottom thickness is of a set of aluminum skis. Anyone? Retract bottoms (not the slide)? Frenchy used 6061-T6 x .100". The -T6 is harder and more resistant to impact damage than -T3. I have 2024-T3 x .090" which is why the plan is to double up the bottom with 2024-T3 x .040".
I can also eliminate the double layer by using cross angles to provide the stiffness on the flat section. Perhaps this would be a better idea eliminating the layer of .040"? There would be less labor forming compound shapes and less weight. Now upon further thought perhaps this is a better route to take? I'm not too concerned about the edges taking a bit of punishment where a few dings wouldn't be too troublesome.
There will be two parallel tunnels attached to and stiffening the bottom which transfer the loads to either side of the wheel axle attachment.
What do you abusers of skis in Alaska think? You mechanics who repair the damage? Dave Caulkins? mike mcs?
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