Noodler, I was not refering to your comment about a vertical sidewall vs a cap, but I was refering to your comment that cap skis have sandwich construction within them. Some cap skis do have a typical sandwich construction within it (hell, some caps even have true vertical sidewalls beneath the cap), however there are differences.
There are some differences between cap skis that most people never realize:
- A capped sandwich will allow slight movements between the layers under the cap.
- A torsion box, is a little different, where it typically has a smaller sandwich construction that is then wrapped in a fiberglass-like material creating a "box" of the core materials. This configuration does not allow for movement between the layers and works on the concept that the wrap transfers the core as one peice, instead of as many peices held together.
- A foam core on the otherhand is more like an extruded core material (Salomon and other foam cores) where the inner structure of the core is one peice of continuous material (foam) and then the cap is wrapped around it.
- Monocoque is a type of cap, I believe the concept of a monocoque was to put a cap that acted like a torsion box, instead of it being enclosed under the cap, the "wrap" was made up of the cap, edges and base material.
The reason I was correcting you is that they do all ski slightly differently and it generally has to do with the ability of layers to slightly move as the ski is flexed and twisted. While a torsion box does typically contain a sandwich construction within the "box" portion, it is generally not refered to as a sandwich construction because the layers are not really able to move the way that a non-wrapped sandwich construction can.