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  • jonas4321 commented on NightHawkInLight's instructable Soda Bottle Rocket Launcher3 years ago
    Soda Bottle Rocket Launcher

    More experimentation, some of this might help those that have not been able to achieve consistent ignition.I switched to 100% ethanol and it made a huge difference. Until the sun went down and the temps dipped into the 50's. Then I was not getting any ignition even with the ethanol!Turns out that the bottle needs some warmth to vaporize the alcohol. Putting 20oz bottles inside my jacket under my armpit did the trick, but what was even more effective was holding the bottle next to the exhaust of my car - that warmed things up nicely and I was back to booming 100% of the time.Another "ah-ha" was that 2L bottles are MUCH more energetic than 16- or 20-oz bottles. LOTS more. Bigger bang, flew farther.Also, nighttime launching SHOULD be done - there's a really cool flash of light as...

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    More experimentation, some of this might help those that have not been able to achieve consistent ignition.I switched to 100% ethanol and it made a huge difference. Until the sun went down and the temps dipped into the 50's. Then I was not getting any ignition even with the ethanol!Turns out that the bottle needs some warmth to vaporize the alcohol. Putting 20oz bottles inside my jacket under my armpit did the trick, but what was even more effective was holding the bottle next to the exhaust of my car - that warmed things up nicely and I was back to booming 100% of the time.Another "ah-ha" was that 2L bottles are MUCH more energetic than 16- or 20-oz bottles. LOTS more. Bigger bang, flew farther.Also, nighttime launching SHOULD be done - there's a really cool flash of light as the bottle launches. No vapor trail, but a nice glow at ignition. Will be taping some glow bracelets to some bottles for nighttime fun! Just gotta remember the warm-the-bottle trick at night.Lastly, I can get multiple launches from a single fueling if I squeeze and release the bottle after the first launch to get some more oxygen into the bottle. With 16/20oz bottles, I get one free launch; with 2L bottles, I get 2 free launches. Just need to remember to add warmth as needed.Thank you again for this really fun design!

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  • jonas4321 commented on NightHawkInLight's instructable Soda Bottle Rocket Launcher3 years ago
    Soda Bottle Rocket Launcher

    After many attempts with 70% and 91% rubbing alcohol, I switched to 100% ethanol and BOOM!!! Works Every. Single. Time. We just happened to have some in the shop at work. I'll be trying denatured alcohol tonight.This is a GREAT Instructable, thank you!!!!

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