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Negative · 07-03-2008, 12:31 PM

Would it be possible to do a colossus mod with balloons cut on both ends, instead of bike tubing? Bike Tubing seems to be too much of a hassle to obtain. That and the fact that I'm lazy.

cantab · 07-03-2008, 12:54 PM

I think it's been tried and doesn't really work.
But seriously, how hard are inner tubes to get? Just go to any bike shop. Are there none in your area?

Silence · 07-03-2008, 01:33 PM

Yep, bike shops will unload tons of broken inner tubes if you ask them to. It's just like grease-run vehicles asking for used oil from fast food restaurants.

Ben · 07-03-2008, 06:41 PM

The main reason you don't want to use balloons with Colossus is because the shapes don't match. Balloons are not cylinder shaped. When one part is starts expanding it'll stretch the balloon, but the other part won't feel any resistance from the balloon. The chamber will then only expand on the part with least resistance (i.e. the curved part of the balloon). And the curve makes the displacement of the rubber uneven, so it gets more complicated. Basically, balloons are the wrong shape. You should use a cylinder shaped layer with a cylinder shaped pressure chamber.

You can get cylinder shaped balloons and I suppose they'd work, but typically they're small like balloon animal balloons. Condoms might work too as discussed before too.

07-03-2008, 12:31 PM	#1
Negative Thinking of something witty to put here... Join Date: Jun 2008 Location: Missouri Posts: 5 UserID: 1637	Colossus mod with balloons? Would it be possible to do a colossus mod with balloons cut on both ends, instead of bike tubing? Bike Tubing seems to be too much of a hassle to obtain. That and the fact that I'm lazy.

07-03-2008, 12:54 PM	#2
cantab Senior Member Join Date: Oct 2007 Location: England Posts: 539 UserID: 1400	Re: Colossus mod with balloons? I think it's been tried and doesn't really work. But seriously, how hard are inner tubes to get? Just go to any bike shop. Are there none in your area?

07-03-2008, 01:33 PM	#3
Silence Administrator Join Date: Apr 2006 Location: Virginia Posts: 3,293 UserID: 576	Re: Colossus mod with balloons? Yep, bike shops will unload tons of broken inner tubes if you ask them to. It's just like grease-run vehicles asking for used oil from fast food restaurants. __________________ Forum rules

07-03-2008, 06:41 PM	#4
Ben Founder Join Date: Mar 2003 Location: College Park, Maryland Posts: 6,054 UserID: 1	Re: Colossus mod with balloons? The main reason you don't want to use balloons with Colossus is because the shapes don't match. Balloons are not cylinder shaped. When one part is starts expanding it'll stretch the balloon, but the other part won't feel any resistance from the balloon. The chamber will then only expand on the part with least resistance (i.e. the curved part of the balloon). And the curve makes the displacement of the rubber uneven, so it gets more complicated. Basically, balloons are the wrong shape. You should use a cylinder shaped layer with a cylinder shaped pressure chamber. You can get cylinder shaped balloons and I suppose they'd work, but typically they're small like balloon animal balloons. Condoms might work too as discussed before too. __________________ email: / Forum rules / Read this page before emailing me. Do not send me a PM or email with a water gun question if someone else could answer the question. Post at the forums. You will get a response from me along with others' views or ideas.

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