Design

[sr180]

Quick questions about how to design skis. I have been reading many of great post about the design features and downloaded the Snowcad program. I want to make a big mountain powder ski, some where in the size of 185 cm long maybe 145-125-135. I dont even know if that would work but on snowcad it has a tip/tail running length what is a general running length of a powder skis tip and tail,and how high of a rise do a tip/ tail go in mm? Any help would be great thanks.

[Easy]

Have a look at Endre's ski geometry measurements. They were posted somewhere on this forum, so it should not be to hard to find them using the search option.

[sr180]

So I think I have it figured out. But would a running length of 160mm in the tip and and 140mm in the tail be too little and would it cause the ski to dive? Also would the tip height of 170 and a tail of 150 be too much.

Also in the process of creating the mold do you need to compensate for any relaxation after press?

[plywood]

So I think I have it figured out. But would a running length of 160mm in the tip and and 140mm in the tail be too little and would it cause the ski to dive? Also would the tip height of 170 and a tail of 150 be too much.

Also in the process of creating the mold do you need to compensate for any relaxation after press?

as you mention floatation/tip dive i guess you want to build some sort of freeride-powder ski. so here is my advice:
even if skis are said to have a more narrow radius in tip and tail than snowboards, i`d go bigger. i`d build a tip that is about 20-25cm long and rises up to 65mm. a higher tip is absolutely not required and won`t do much good. with such a 20-25cm long, 65mm high tip you get a nicely rising tip. it will cause you less troubles when pressing AND give you much much float on your skis.

the slowly rise lifts the tip up to the surface while a steep rise in tip acts a bit like a brake because it dams up the snow in front of the tip instead of "gliding over it".

then just use the radius you get for the tip for the tail too and you`ll be fine. tail doesn`t have to be that high, unless you want to ride switch in pow. maybe 15cm long and 40mm high.