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Your builds are a testament to the virtues of lightweight.
While it would require major changes to the design & defintely add weight I can't help but think that a 2 cylinder fanner would be the ultimate powerplant to improve performance and overall, thrill factor.
Something like a Polaris Pro X 440 engine..........:face-icon-small-hap
Definitely a different experience.
You should try snowbiking........ in the same terrain you ride you would have a blast.
My axys has a power to weight of 3.71 lbs per hp.
With rider.
My ktm sx450 (62 hp) with Timbersled aro 120 (and rider) is 8.2 lbs per hp.
Dry weight of bike and kit is 310#
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Yes, but my construction is not meant to beat big-engine snowmobiles with small snowblower engines in terms of horsepower. It is the buoyancy (the blue number) which is the most important for my application. And at this level I have done well, a lot better than snowmobiles in this category (light mechanical snow shoes) and not just a little. It is this specification that allows you to go slowly in the undergrowth, to stop and leave anywhere without digging.
The PRORMK 155 '' version is 0.58 lbs / in2, the best mountain snowmobile, but its weight at low speed is mainly on the front. The snow bike with its little track is 0.72 lbs / in2. The manufacturers are already doing what is best in terms of power ratio (unless you add a turbo and lose all reliability) hands in terms of buoyancy for small utility snowmobiles, they are in the field.
The floatation number is really a good indication with a sled.
You’d be surprised what you can crawl along through (deep) with a snowbike due to the ski packing a trail and not having any running boards or belly pan to get high centered on.
Then when hills are involved nothing can slow sidehill like a snowbike.
An enduro style bike with a 136” track kit will float and easily traverse steep terrain in the deep and or very deep.
Please be clear I’m in no way disparaging your machines just offering an alternative. (That handles sidehilling in its sleep) lol.
Build your own light weight version?
Would only be a minor change to single ski.
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I did not have the opportunity to see snowbikes on the same field as me. But I have said that it is difficult (very physical to drive) I'm not a bike guy (I'm mountain biking in the summer) so it would be more difficult for me.
Certainly the side hill is naturally much easier than with a snowmobile.
I already thought I might build a smaller, less powerful (and less expensive) version to begin with.
What are the ability to climb at low average speed between trees of your SX450 vs RMK vs 800R! custom snowbike?