Re: Aquajets (rockets)
Matt Gulick (mgulick@RADIUS.COM)
Thu, 29 Jun 1995 11:42:58 -0800
At 10:39 AM 6/29/95, Rod Keen wrote:
>last weekend on our channel 4 tv there was a program about rocket
>makers (not NASA ESA etc). Most were either solid or liquid burning
>fuel. One even had a motor that would power a Tomahawk cruise missle!
>Anyway one of the other types fired was what is called an _AQUAJET_
>basically its a plastic drink bottle (2 litre) with pressurised water
>as its propellant. What a brilliant idea for Cubs, and, if we tie
>someones foot to it maybe we can lose a cub or two (given the correct
>bribe) ONLY JOKING!
>Does anybody have construction info for this type of rocket? or know
>where i can ask?
It is really quite simple. You need a plastic bottle (1 and 2 litre both
work great) a rubber cork that will fit snuggly in the bottle (The cork
kind work but not as well), a bicycle pump and a pump needle (the kind used
for basket balls).
Drill a small hole through the stopper so that the pump needle fits through
very snuggly. Fill the bottle 1/3 with water. More watter will just weigh
down the bottle as there will not be enough air pressure to expell it all.
Insert the stopper and attach the bick pump. Start pumping and expect to
You can build some kind of stand for the bottle but I found that building
fins for the bottle worked best. They functioned as legs for launch and
then kept the bottle stable during flight. They can be made of cardboard
but will "melt" after a few launches. I used plastic binder inserts (the
ones used to seperate sections) with great success.
I used to be a Bear...
Terry Howerton Sakima Group, Inc. SCOUTER Magazine Kansas City