water rockets

would anybody like me to post a Instructable showing how to make a clark cable tie water rocket launcher look at this image for a example;

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chassie9 years ago
it works for my school project!!!!!!!!!! =)
westfw10 years ago
heh. I ended up just making one of those; part of an unsuccessful attempt to get my daughter to use rocket propulsion for her school physics project :-( Mine is "typically minimalist", using cardboard in places where others have used PVC, and using a slot filed in a sched-80 PVC pipe to seat the O-ring.
cable-tie launcher.jpg
rocker9455 (author)  westfw10 years ago
thanks for the pic ow everyone will know wat im talking about ps nice launcher are you using a bike pump to power it? i will probably put a air line quick connect on it for quicker filling if my dad gets a compressor
westfw rocker945510 years ago
Yep; that's the bike pump on the bottom. Compressors make me nervous; too easy to turn up the pressure a bit to high. And in this case, the while thing needed to be buildable by n 8th grader and used at school (and I was planning on sticking with air as the reaction mass.)
its a lion westfw10 years ago
i have seen those before but never made one. i have a question... how exactly do you get the bottle off of it? i know how it holds it on, but how do you disconnect the bottle when your done and make it launch? bah, bad wording, i cant come up with any better way to say it, sorry about that. i hope it makes sense.
westfw its a lion10 years ago
You pull the "launch" tube (in this case brown cardboard) tube downward to the position shown in the photo, at which point the springiness of the cableties and the collar underneath them (whitecardboard!) causes the edges to spring outward (to about the position they're in in the photo.) At that point, the internal air pressure pushes the bottle off the guide tube (gray plastic.)
its a lion westfw10 years ago
makes perfect sense now. thanks.
WaterBoy10 years ago
I've just completed a launcher for the back-yard test range. It provides a fitting for the garden hose and bicycle pump. You just plug the rocket into the top, turn a valve to fill the bottle, then pump and release!

See: my Launcher

See also:

westfw WaterBoy10 years ago
Very nice. A parachute and everything! How did you manage to miss all those trees?!
WaterBoy westfw10 years ago
Amazing luck is the only explanation. We quit after the second flight knowing we were beyond any likely success. Next we'll take it to the local park and use 100 psi!
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