Pyramid Design

[Mills]

Because a snowmobile is sold commercially to the public the engineers by regulation would have to do the proper FEA in their 3-D modeling system for the initial deisgn. This either validates their design and they submit it for acceptance or it shows them exactly where the tubing is weak and needs redesign. If a redesign is needed it would have to be evaluated with FEA again to ensure the weak areas were strengthened to the calculated max load plus a safety factor. The FEA would also ensure that the redesigned and strengthened area did not transfer load to another area causing it to exceed the design limits.
This all works in theory and passes regulation but, for those of us that own Nytro's we know that the FEA models and regulation don't always cover real world experiance and we end up with bent subframes and have been doing so for 5+ years. So, I am going to stick with my rule for all things that go fast and give me the adrenalin rush I need - NEVER buy the first year of a new design!!!

 

[Yamacat21]

Because a snowmobile is sold commercially to the public the engineers by regulation would have to do the proper FEA in their 3-D modeling system for the initial deisgn. This either validates their design and they submit it for acceptance or it shows them exactly where the tubing is weak and needs redesign. If a redesign is needed it would have to be evaluated with FEA again to ensure the weak areas were strengthened to the calculated max load plus a safety factor. The FEA would also ensure that the redesigned and strengthened area did not transfer load to another area causing it to exceed the design limits.
This all works in theory and passes regulation but, for those of us that own Nytro's we know that the FEA models and regulation don't always cover real world experiance and we end up with bent subframes and have been doing so for 5+ years. So, I am going to stick with my rule for all things that go fast and give me the adrenalin rush I need - NEVER buy the first year of a new design!!!

It's not a first year design cat has this chassis dialed in. The rest of like gearing and tuning are what we need to be concerned about but I have confidence they aren't going to sell us a turd sandwich and call it prime rib.

 

[stingray719]

Mills and Yamacat21 I agree with you both. A first year YAMAHA suspension would scare the bejesus out of me.....but a 3rd year Cat suspension would give me no worries. Oh, by the way the first two years for the Cat suspension had some bugs....

 

[larrypolaris]

I am sure Yamaha did their DFEMA's and stress analysis in those joints to ensure proper strength.

Like the auto business that I am in we have computer modeling tools that can model high stress areas.
I am sure Yamaha has the same type of modeling tools.

 

[2lapsdown]

I am sure Yamaha did their DFEMA's and stress analysis in those joints to ensure proper strength.

Like the auto business that I am in we have computer modeling tools that can model high stress areas.
I am sure Yamaha has the same type of modeling tools.

Yamaha has absolutely nothing to do with the chassis design for the viper. It is completely Arctic Cat's baby. Yamaha's involvement is having the folks in TRF bolt on some different clutches, some different shocks and a few other pieces. It will be a very good sled, but people need to to be realistic about the Yamaha input, which is virtually nil.

 

[nytrolabrador]

I am sure Yamaha did their DFEMA's and stress analysis in those joints to ensure proper strength.

Like the auto business that I am in we have computer modeling tools that can model high stress areas.
I am sure Yamaha has the same type of modeling tools.

Yamaha has absolutely nothing to do with the chassis design for the viper. It is completely Arctic Cat's baby. Yamaha's involvement is having the folks in TRF bolt on some different clutches, some different shocks and a few other pieces. It will be a very good sled, but people need to to be realistic about the Yamaha input, which is virtually nil.

hahahah you have no clue lol yamaha has had alot to do with the build they are not simply just sending there motor and sayin put that in a cat and put some yammie stickers on it.. do some research before you talk yamaha made a nice few changes to the machine .. they even helped cat fix the chaincase

 

[2lapsdown]

I am sure Yamaha did their DFEMA's and stress analysis in those joints to ensure proper strength.

Like the auto business that I am in we have computer modeling tools that can model high stress areas.
I am sure Yamaha has the same type of modeling tools.

Yamaha has absolutely nothing to do with the chassis design for the viper. It is completely Arctic Cat's baby. Yamaha's involvement is having the folks in TRF bolt on some different clutches, some different shocks and a few other pieces. It will be a very good sled, but people need to to be realistic about the Yamaha input, which is virtually nil.

hahahah you have no clue lol yamaha has had alot to do with the build they are not simply just sending there motor and sayin put that in a cat and put some yammie stickers on it.. do some research before you talk yamaha made a nice few changes to the machine .. they even helped cat fix the chaincase

Umm...I have nothing to add. Have a swell weekend.

 

[snowbeast]

You guys are way over thinking this chassie,i have the 13 kitty turbo lxr 129 track,studded TD stage 4 tune with muffler,and hammer it most of the time at 220 hp,sometimes at 250 hp,and have no structual damage of any kind,only problem,at 2500 miles i lost the chain adjuster,which took out the chain and gears,all covered under warrenty,so this year new man. chain adjuster and i want them to warrenty my drivers,as it rachets bad when hooked up hard.

 

[09nytro]

I thought BRP had some help in it to ... That's what this guy said to this other guy that told the guy that told me....... Lol .....,

 

[fxnytrortxkid]

Cat isn't using the yamaha redesigned chain case, they feel their design is "sufficient" however yamaha did make several tweaks to the sled. The chain case, more foam in the seat so u dont keep ball slapping the tank, diff ecu programming, exhaust is different (same header), clutching, gears, chain, belt are all different.

The chassis design is cats. The job of fitting motor into sled was also on cats plate. At that point yamaha came in and beat them into the ground to see what needed to be changed.

 

[Off Trail Mike]

Interesting topic....you guys are very detail oriented!

Yea FEA and cold forming bends (which increases steel strength) I'm sure were all evaluated, so I wouldn't give it a second thought. Now if you are planning to do 100 foot jumps onto hardpack, you are probalby well over all the design limits anyway, and its not those tubes I'd be worried about.

Hey Stingray....would you believe the basic "uncoupled" Cat suspension has been almost the same since probably 2007/08 when the rear axle Fox Float option got added. I use it on my MTX and although its been refined alot, it always been a winner.

OTM

 

[2lapsdown]

Cat isn't using the yamaha redesigned chain case, they feel their design is "sufficient" however yamaha did make several tweaks to the sled. The chain case, more foam in the seat so u dont keep ball slapping the tank, diff ecu programming, exhaust is different (same header), clutching, gears, chain, belt are all different.

The chassis design is cats. The job of fitting motor into sled was also on cats plate. At that point yamaha came in and beat them into the ground to see what needed to be changed.

The seat design was changed on all the 2014 Arctic Cats with the exception of the high country model. The old design could be a "pain"!

 

[fxnytrortxkid]

Nice to hear cat didnt totally ignore all the improvements yamaha made

 

[cannondale27]

Looking at parts other than color,graphics,ski tips,windshield shape,wiring plugs,clutches and secondary shaft everything on the ZR 7000's is the same as Viper. Not the same as the other ZR's. Closer to the new Eltigre 2 stroke. So there should be many interchangeable parts.

 

[2lapsdown]

Nice to hear cat didnt totally ignore all the improvements yamaha made

Really?