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Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
Diterex

CO2 Rocket Fully Assembled

by Diterex Nov 10, 2017
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can you upload one, with the fins rotated to the out position for printing, as an stl please? the design is great, and printed in flexible material at 2" diameter, it looks sweet, but the flexible has just a bit too much stringing, and the regular pla doesn't have the layer adhesion, so I am at a loss, but I would like to try it printed with the fins out, and see if that launches out of the T-shirt cannon. Thanks

I have added the fin.stl and the step file to help you if you want to remix.

The problem is that the end of the powerlet isn't a proper nozzle, and you won't get anything like an even flow out of it. Combine that with the liquid nature of the propellant and the constantly-shifting center-of-gravity, and it won't ever fly straight. You need to shift the COM quite far forward.

Yeah adding weight to the front will be the most helpful.

You need to make the rocket longer, make the fins bigger, or add nose weight to make it stable.