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Old 04-08-11, 10:30 PM   #1
e-Man
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Bike pump air hoses question

A little off topic from bikes, but involves a bike related accessory. I have two floor pumps at home, one works and the other was given to me after my dad lost a piece (kept it in case I broke a part on my pump). I am going to try to launch some water bottle rockets with my pump, but I am a little nervous about standing too close when the bottles pop off. I thought about unscrewing the hoses and combining them together to make a longer, safer hose for this project. Not sure what connector would work in this case. Anyone ever tried coupling two lines together?
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Old 04-09-11, 03:57 AM   #2
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This isn't an answer but call up a couple hardware stores and ask for the more experienced guys, they might know. Also try a few plumbing stores.
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Old 04-09-11, 04:54 AM   #3
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barbed nipple and two hose clamps. Local hardware store should have them.
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Old 04-09-11, 08:57 AM   #4
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sweet, thanks to you both
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Old 04-09-11, 09:14 AM   #5
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Be sure to wear safety glasses for the launch..............................
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Old 04-09-11, 09:35 AM   #6
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I don't think there's any danger there - the most that might happen is that you might get wet!

My son did this as part of a physics class project in high school. As I recall you pumped the air in while the bottle was locked on the stand, then you "pulled the trigger" via a string from a "safe" distance away. The lock/trigger was a u-shaped piece of plastic that locked onto the ring that is just under the cap of a two-liter bottle.

(Anybody know what that ring is for? At the bottling plant, the bottles, before filling, are conveyed along by hanging them by that ring in a sort of tube with a slot in the bottom. The tube is arranged with a bunch of angled jets on top that blow compressed air, and the empty bottles are just blown along the tube.)
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