Interesting...I'll have to do some flexing of my Eons...MikeK wrote: I don't know if it got lost in the last flurry of posts but the tail is definitely stiffer on the S78 and the Ingstad than the Eon. It should stay flatter in deep snow.
How about the Eon itself- do you find the tail of the Eon softer than its tip? I have always thought the tail of the Eon was stiffer than the its tip...But- maybe I have it wrong. I'll do some investigating.
This is revealing as well. Your camber-stiffness tests have revealed that these XCD-touring skis (Eon/S78/Ingstad) all have near identical stiffness in the camber dimension. But that is not the whole story...I actually had no issue with the 78 in that deep snow I was in earlier this week. It didn't feel like it was bowing as I was touring with it.
Canna and Tom have described the flex pattern well- that initial softness- but as you approach flattening the camber- the ski becomes resistant (almost like a coiled spring). (Mike- similar to your descriptions of the the incredible stiffness of the second camber on your Glitts). It's sounding like the S78 is similar to the Ingstad in this dimension...
The Eon is nothing like that. The Eon has even a little bit more initial camber-stiffness- but as you approach flattening out the camber there seems much less resistance than the Ingstad/S78- it reverse-flexes with very little effort. This is not necessarily a negative quality when downhill skiing on soft snow. But- it has a very significant negative effective on XC K&G performance.
In order to get effective and efficient K&G there has to be enough resistance to support that kick and glide.
I suppose the relevance of all of this depends a lot on the snow you are skiing on- as well as your technique or skiing style (and of course skier weight). I push my skis very hard to perform- and for years I have found the Eon wanting- it does not have enough resistance for me.
The flotation issue is a big deal as well. I would never expect a ski in these mid-width dimensions to offer effective flotation in truly deep snow (not unless it was as long as a 270cm Finnish hunting ski!). But I do expect a Nordic ski this wide to offer effective flotation in at least moderately-deep snow (say to 16 inches). Heck- that's probably the only reason I would own a Nordic ski in these dimensions! The lack of resistance in the Eon gives little effective flotation. At 185lbs, when I am on more than 12 inches of fresh, soft snow, the waist of the Eon sinks to the base, leaving the tips floating near the surface. Again this does not seem to be an issue with lighter skiers.
In my opinion, if a mid-width XCD ski cannot support effective K&G on moderately-deep fresh snow, it’s not worth having. You might as well be on a narrower, stiffer, faster ski like the E-99/Glittertind/Gamme 54.