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BACKCOUNTRY RIDES - BUILD THREADS We all like to see builds from the crate up. Bring us along for the creation.

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Old 11-07-2011, 12:23 PM
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Smile Tube Chassis Powder sled

I was inspired to join after reading RLFCOM's build thread, which by the way I am looking forward to seeing more of!
I was also inspired to share my budget tubie build as well. Since I'm a mechanical engineer I've taken the time to model up my design before I begin so I can get everything layed out before I start cutting metal. That and since I'm trying to do this on budget it gives me something to do while I save up my funds.


My goal is to have it less than 300lbs dry, according to my calculations and modeling I should be close, but maybe slightly over.
Let me know what you think.
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Old 11-07-2011, 12:25 PM
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welcome to the site
sled looks pretty cool
that weight would be nice as well
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Old 11-07-2011, 12:32 PM
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Thanks, I still have a lot to do but am excited to start cutting some metal soon.
I not the biggest guy in the world and a light sled is important to me.

My apologies its Rlcofmn's thread that did the inspiring.
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Old 11-07-2011, 12:35 PM
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So what size tube are you using? Track size? Engine?

It all adds up and adds up fast, good looking model tho can't wait to see more of your build!
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Old 11-07-2011, 12:38 PM
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keep up to date and lots of pics
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Old 11-07-2011, 12:47 PM
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Welcome to the site! I live close to you, located in Superior. Cant wait to see pics of you build!!
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Old 11-07-2011, 12:54 PM
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Ah yes I knew I was forgetting something, the technical details!
I picked up a couple of old ski-doos as donors, since they were free I can"t complain. So alot of the parts come from them.
the engine is a 1980 Rotax model 503, and the secondary and chain case come from a '75 TNT.
I picked up a used 151-152" x 15" track and modified the drive axle to accommodate it.
I also picked up a set of stock 03 summit skis and spindles, which are way better than the old sleds metal skis(20lbs a piece!).

As far as tube sizes go I want ed to go with .75" x 0.35 wall steel but I don't think my welder will be able to weld that thin. So I am going with .625" x .049 for the tunnel with .375 x .049 for the cross pieces. Up front I'm planing on using 1" x .049 square tube.
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Old 11-07-2011, 01:02 PM
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Only thing I see is that with the chaincase and clutches both on the same side, is keeping the weight distributed evenly left-to-right. Makes a big difference in how a sled will handle.
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Old 11-07-2011, 01:05 PM
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Quote:
Originally Posted by Mule View Post
Only thing I see is that with the chaincase and clutches both on the same side, is keeping the weight distributed evenly left-to-right. Makes a big difference in how a sled will handle.
True, but that's what I get for using parts from the 70's. I'm hoping the weight of the exhaust on the right side will help even things out.
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Old 11-07-2011, 01:29 PM
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Originally Posted by Snow_ME View Post
True, but that's what I get for using parts from the 70's. I'm hoping the weight of the exhaust on the right side will help even things out.
Or put oil/coolant bottles over there. Maybe a spare gas can/reserve tank for some ballast.
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