LaplandPaul wrote: ↑Sun Mar 05, 2023 3:02 pm
Yes, I am considering grip wax, but the Crown on my TN66 worked very well so far, so there needs to be some benefit to outweigh the extra efford
I really think that you won't find grip wax laborous- especially since you live in a northern climate, with long periods below freezing. (AND- once you have experienced the magical performance of grip wax, you might feel a little underwhelmed by even Fischer's Offtrack Crown...)
Maybe I do not understand the term trailbreaking correctly... Why would the Amundsen be a better trail breaker in breakable crust? The shovel width is identical to my TN66 so the boots would still drag on the crust. Yes the shovel is stiffer and no rocker but if you sink 20cm/8inch under the crust, I would expect that breaking the trail wider (using a wider shovel) would be much better.
You are not breaking trail with the tip of a rockered ski- you are breaking trail with the rockered shovel.
This is always inefficient compared to a non-rockered shovel, but it is brutally inefficient in breakable crust- the rockered shovel rides on top of the crust, while the waist breaks through the crust.
The non-rockered Combat NATO is a very good XC crust buster, but I have tested it against the narrower, stiffer, Amundsen enough times to know that it is even better.
The Combat ski is not rockered, but it does have a relatively soft shovel (i.e. in comparison to the midsection of the ski- the Combat shovel is still stiffer than say a E109/TN82 XL)-
the "soft" shovel of the Combat- combined with its sidecut- can result- in certain crust conditions- with the "narrow" waist breaking through the crust and the much wider, softer shovel riding on the crust.
Generally speaking, the Combat is excellent in breakable crust- but, I must admit that the Amundsen is even better.
Could anyone give me a short explanation to what makes a ski good for trailbreaking or refer to a source where I could read up on that?
Characteristics of a good trail-breaking ski- in backcountry-cross-country context:
- no rocker
- stiff, raised, triangular tip
- little to no sidecut
In my experience, rocker is a disadvantage when it comes to breaking trail- in any type of snow.
(Rocker definitely improves downhill performance.)
mca80 wrote: ↑Sun Mar 05, 2023 11:49 am
just how deep is deep?
You are right, on the pictures, there is no deep snow. Those were just one example where the new ski will be used. There was maybe 10cm/4inch of soft snow under the crust in those pictures. I am not looking for a ski for deep snow,
I am looking for a ski to break trail efficiently, especially with icy crust with some soft snow below.
The Amundsen is my best XC ski in these conditions you describe- with the Combat NATO a close second for the most part.
BTW- the Nansen is also pretty good, but it's sidecut- combined with it's rounder flex- can cause the narrow waist to break through, with the shovel and tail riding in the crust (similar to my description above).
lilcliffy wrote: ↑Sun Mar 05, 2023 10:07 am
I have kept it for heavy visitors
Why that? is the 199 too long for your weight? I am 80 kg... should I go shorter?
No, I don't find it too long for my weight- I just don't find I gain anything with the 88 vs 78 at that length- and the 78 is lighter and faster, so I have no use for the 88...
I
compared my girlfriends
Fischer Excursion 88 in 179 today to my
TN66 in 205. Snow was 10cm/4inch of fresh powder on top of a weak crust under wich was 20cm/8inch of powder. I felt like both skis give the same flotation. But the shovel of the E88 was easier to push forward but did not emerge to the surface. The TN66 shovel came up to the surface but I had a harder time to push the ski forward. Especially, due to the boots that got caught up in the crust pieces. After this test, I feel like the few millimeter more from the E88 compared to the TN66 do not really matter. I probably need to go 100mm wide to get better trailbreaking and a proper pathway for my boots? Or do I have wrong expactations? Maybe one of those Finnish forrest skies could work like I expect (Peltonen METSÄ BC)? But those have super soft tips... seems to work even less when there is a crust... I am lost
I would suggest that you are primarily dealing with crust and your boot due to the soft rockered shovel of the TN66 (as opposed to its width).
...........
The Metsa has reverse sidecut and a flex profile for covering distance in very deep snow- the core of the ski has zero sidecut and offers a completely stable platform- the softer reverse-sidecut shovel tapers up to a raised, pointed tip- when pushed through deep soft snow, the combination of the soft-flexing, reverse-sidecut shovel and raised, pointed tip, produces an extreme version of a traditional raised Nordic ski tip- perfect for breaking trail in very deep soft snow. I am not sure how this design would work in breakable crust...There are Finnish forest ski designs that have stiffer shovels- perhaps intended for spring snow and breakable crust?
...