Ok - this get's a little clearer. Regarding you flex/rebound test with carbon on top/below it would be interesting to know if there was a glass laminate on the other side of the core? Kevlar laminate is indeed not well suited for taking compression (1/5 of Carbon and about half the compressive stren...

Two weeks ago i have been on a skitest event too. I can definately agree on your ranking of the Dynastar XXL. It's the best conventional shape ski i've ever tried - just awesome how it performs under all conditions from hard stuff to powder. For the soft conditions i personally prefer those reverse ...

Very complex composite design - impressive :D Two questions regarding your testing: Did to compare the properties of carbon above and below the core? Theroetically it should be better below the core!? Do you have some more information regarding the use of Kevlar - where do you see the biggest advant...

Basalt has a higher density so a laminate with the same thickness/volume will be heavier. But you should compare the other properties as well: tensile strength is 40% higher compression strength is 25% higher and it's 16% stiffer So overall you can reduce the amount of fibers and get a lighter compo...

Here's a comparison Basalt - E-Glass: Dichte g/cm³ 2,75 2,6 Zugfestigkeit MPa 4840 3450 Druckfestigkeit Mpa 3792 3033 E-Modul MPa 89000 77000 Bruchdehnung % 3,15 4,7 in english: density g/cm³ 2,75 2,6 tensile strength MPa 4840 3450 compression strength Mpa 3792 3033 Young's mmodulus MPa 89000 77000 ...

Basalt fiber fabrics become more and more available. R&G (Germany) now sells a 280g/m^2 fabric and a 240g/m^2 UD! Here's an article about Basalt in Produktion: [/url] http://www.compositesworld.com/ct/issues/2006/August/1400/3 And those guys are already using it for snowboards: http://www.lib-te...

I shaped my first cores with a handplaner two years ago - works well for soft woods. My latest core is made from ash which makes planing a bit tough - so i used an electric hand planer which works extremely well.

As i'm no park skier and my abilities to go switch are very limited i optimized the tail for regular skiing. In my opinion a swallowtail has two advantages: - Low tail lift - sinks very good in soft snow. - In combination with few bending up of the tail you get a long running lenght and excellent st...

This is a long and very interesting thread! Unfortunately i haven't had the time to fully read it yet - but hopefully i can add some usefull information: Last year i started with a reverse sidecut: http://skibuilders.com/phpBB2/viewtopic.php?t=177 http://skibuilders.com/phpBB2/viewtopic.php?t=219 I ...

This video is fantastic - showing each step very clearly! Great help for everybody getting started with skibuilding and even interesting for more experienced people seeing differences in approach.

PB - what did you pay for shipping the rubber to UK?

If anybody plans to order VDS rubber - i'm interested too!

Three questions regarding UV radiation contained in Sunlight: Regular epoxy resins suffer from UV light changing their colour. Is there also a degration in mechanical properties? Are those special resins with UV protection able to resist the amount of light a ski gets for about (100days / 6h a day -...

Bamboo starts to get more and more available. I got one sheet (200x40cm) for 12,-EUR from a veneer online-shop in germany (ripping it from Bogner skis is another way - but a little more expensive ;) ). It is 0.7mm thick - weight about 100g/ski. Yes, the skis have 0 camber and a 25cm long 8cm high sh...

May i introduce my latest project: This Ski is a combination of traditional and reverse sidecut ski, that hopefully preserves the advantages of both designs. The ski center under the boot is 135mm wide: http://www.wildplaces.de/paar.jpg The topsheet is bamboo veneer. Here's the airex core for the sk...

For skis designed for soft snow conditions (and especially those with more exotic sidecut) i still think the method of calculating areas before and behind the mounting point is quite suiteable. 42-43% area behind the mounting point proved to be working well.