I'm not very good at Mechanical math - mattman or others can you help again.
(I've already gone from 650gsm to 750gsm glass witht the help of mattman)
Ski
Length 180cm
Core length 1550 (20cm tip 5cm tail)
Core thickness 2.5mm,11.5mm,2.5mm - smoothed pyramid in shape.
Tip width 130, 100 underfoot, 119 tail
Currently using 750gsm (22oz Glass)
Here are the calculations on both Glass and Flax for comparison
· Glass: 400 g/m2 fibers, 50% fiber volume fraction 50% matrix volume fraction, thus composite 596 g/m2, 0.31mm thick and modulus 39GPa, thus stiffness 12235 N/mm
· Flax: 400 g/m2 fibers, 50% fiber volume fraction 50% matrix volume fraction, thus composite 785 g/m2, 0.62mm thick and modulus 31.5GPa, thus stiffness 19385 N/mm
The material I will be using will be
400 g/m2 UD and 360 g/m2 biaxial +/- 45° flax
I am not looking for anything super accurate - although I know there are some rocket scientist lurking
![Wink ;)](./images/smilies/icon_wink.gif)
Just trying to avoid shooting in the dark - not my preferred method of core calculation.
In future this may be a source of bio replacement for fibreglass for us all
Thanks in advance
Tom
( how the calc is done would be great to know so I can change all my other skis
![Wink ;)](./images/smilies/icon_wink.gif)