Low Density Sidewalls

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Thelongride
Posts: 33
Joined: Thu Jun 06, 2019 8:53 am
Location: Washington

Low Density Sidewalls

Post by Thelongride »

So it seems full length sidewalls are quite a large portion of lightweight touring skis weight, and if there were a lower density alternative one could save quite a large number of grams per ski. The problem is that impact resistance is so closely related to density

Has anyone somehow done an lower weight poly pour? Or perhaps there's a lower density version of abs/UHMW I'm not aware of?

I suppose cap construction is always an option

pmg
Posts: 461
Joined: Sat Dec 01, 2012 8:59 am
Location: Sonthofen

Re: Low Density Sidewalls

Post by pmg »

Hi, my solution is to only have 2.5-3mm thick sidewalls. This adds little weight but offers nearly all benefits of a sidewall. The only possible issue is that on a hard impact on the edge, there is less sidewall to take that impact. But a hard impact with constant edge deformation always is a bad damage to the ski, no matter if the sidewall is thick or thin...

Thelongride
Posts: 33
Joined: Thu Jun 06, 2019 8:53 am
Location: Washington

Re: Low Density Sidewalls

Post by Thelongride »

Woah, you must have amazingly precise presses! I suppose I could go this route, but I feel that the risk of profiling through a 2.5mm sidewall into the core would happen on a regular basis for me. I need a bit of a larger margin for error than that ;)

pmg
Posts: 461
Joined: Sat Dec 01, 2012 8:59 am
Location: Sonthofen

Re: Low Density Sidewalls

Post by pmg »

Hi,

check this: I use 3 thumbtacks glued to the base to keep the core in position during layup. the core then can't move more than about 0.2mm without getting resistance from the thumbtacks.

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