Search found 140 matches

by SleepingAwake
Fri May 15, 2020 8:43 am
Forum: Ski/Snowboard Design and Layup
Topic: Polyester fleece or fleecing a carbon fiber ski
Replies: 8
Views: 1326

Re: Polyester fleece or fleecing a carbon fiber ski

The point is not just to have a resin rich layer, but to have a smoother transition in the stiffness between different layers to reduce shear stress.
For the same reason it is best practice to have the +/-45° layers inbetween the UD and the core.
by SleepingAwake
Mon Feb 24, 2020 1:03 pm
Forum: Ski/Snowboard Design and Layup
Topic: Polyester fleece or fleecing a carbon fiber ski
Replies: 8
Views: 1326

Re: Polyester fleece or fleecing a carbon fiber ski

My local supplier has a 30gsm glass veil that works well, but it really shouldn't make much of a difference what exactly you use as long as it has a decent bond with epoxy and will form a resin rich bond line.
by SleepingAwake
Thu Jan 02, 2020 5:41 am
Forum: Journals: Log Your Ski Building Progress
Topic: FFC 2019
Replies: 3
Views: 1238

FFC 2019

I missed to make a build series on here, but i took a couple of pictures of the final boards i built for my girlfriend and my godchild. There is some more info in the "Need some help with kid snowboard" thread in the design and layup section for the little board. http://www.skibuilders.com/phpBB2/vi...
by SleepingAwake
Thu Jan 02, 2020 2:51 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

Nice work! I love the graphics! :) yeah I too love the graphics, btu cannot take credit for those. My brother designed it based on a drawing of my godchild. attached is the core profile. sorry for the stupid format, couldn't find a way to have a table in here. the layup is the following: topsheet 1...
by SleepingAwake
Tue Dec 31, 2019 7:27 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

https://reto.phipi.ch/wp/wp-content/uploads/2019/12/DSC2880-2.jpg https://reto.phipi.ch/wp/wp-content/uploads/2019/12/DSC2884-1.jpg https://reto.phipi.ch/wp/wp-content/uploads/2019/12/DSC2887-1.jpg https://reto.phipi.ch/wp/wp-content/uploads/2019/12/DSC2893-1.jpg Super stoked with how it turned out...
by SleepingAwake
Thu Nov 28, 2019 4:14 am
Forum: Ski/Snowboard Design and Layup
Topic: Veneer and clear topsheet bubble elimination
Replies: 4
Views: 1254

Re: Veneer and clear topsheet bubble elimination

https://youtu.be/o11Q4Iv7LuI here is a video where you can sort of see the process, without wood tho
by SleepingAwake
Wed Nov 27, 2019 6:53 am
Forum: Ski/Snowboard Design and Layup
Topic: Veneer and clear topsheet bubble elimination
Replies: 4
Views: 1254

Re: Veneer and clear topsheet bubble elimination

Bit of a detour but i made a veneer behind topsheet snowboard that turned out crystal clear no bubbles with vacuum infusion. Basically you stack the topsheet, veneer and the reinforcement fibres, then peel ply and a flow media, vacuum bag it, and then do the infusion. After curing you have a laminat...
by SleepingAwake
Fri Oct 25, 2019 3:43 am
Forum: Journals: Log Your Ski Building Progress
Topic: Juke 19/20
Replies: 4
Views: 1495

Re: Juke 19/20

super cool graphics!
by SleepingAwake
Sat Oct 19, 2019 12:05 pm
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

leahicmoradnuf wrote:
Fri Oct 18, 2019 10:37 am
Lookin good! I'm curious to see how balsa works out for ya.
I built plenty of skis with those cores so can't see a reason why it wouldn't work!
by SleepingAwake
Sat Oct 19, 2019 12:04 pm
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

Why you dont make the inserts shorter? And .... 0.6mm more length for the inserts will be absorbed by your fibres (depending on the fibre weight) The inserts come with a cap which is handy, the small step in the thickness will not increase the overall flex anyway as this area is much stiffer with t...
by SleepingAwake
Tue Oct 15, 2019 11:52 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

Alright making some progress here. Balsa core with some weird wood at the inserts, bamboo sidewalls with cast tip and tail spacers. core thickness would be 5.6mm, so i'm going to locally increase the core thickness in the insert area to accommodate the 6mm inserts.
by SleepingAwake
Thu Sep 26, 2019 11:08 pm
Forum: Ski/Snowboard Design and Layup
Topic: Snappy or Poppy Skis
Replies: 5
Views: 1581

Re: Snappy or Poppy Skis

A lot of it comes down to the shear properties of the core.
by SleepingAwake
Thu Sep 19, 2019 3:56 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

I would love to share the spreadsheet, but cannot because it is an adapted work thing. But it is just based on sandwich theory and basic mechanics and for sandwich panels we get within 1 to 2 percent of the calculated stiffness.
by SleepingAwake
Thu Sep 12, 2019 1:08 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

Aha thanks chrismp for the clarification. this is what i had in mind actually using a unbalanced fabric with more fibers running in 0°
flex.PNG
flex.PNG (27.9 KiB) Viewed 1996 times
this where i'm at right now. I'll keep you guys posted on the progress.
by SleepingAwake
Wed Sep 11, 2019 4:35 am
Forum: Ski/Snowboard Design and Layup
Topic: Need help with kid snowboard
Replies: 25
Views: 3583

Re: Need help with kid snowboard

thank you guys for the inputs. I'm rather fit with the nerdy stuff and i ran some numbers and with the 1/3 stiffness approach and a light-ish glass layup and a Bcore balsa core that i use in my skis i still get a reasonable core thickness. otherwise i would increase the core thickness locally in the...