Valves for lemonade bottle rockets
Wed, 20 Feb 1991 01:09:12 PST
Over the Christmas holiday I was building lemonade bottle
rockets again. I had managed to find a supplier of the correct sized bored
rubber bungs and I had also managed to get a local car tyre shop to save me
about a hundred old car tyre valves. The problem that I had was that with all
the rubber on them they were too big for the bungs and made them swell up too
much. Problem how to get rid of the rubber?
I decided that the easiest way would be to burn the rubber off but this
would damage the rubber seal in the valve core.
I purchased a valve core removing tool, this cost me a pound from my
cycle/car accesory shop. Using this tool I removed all the valve cores from
their threaded brass tubes. I then placed the brass tubes in a can with a
little methylated spirits and set fire to them. When the flames had gone out
and the blackened mass has cooled down I removed them from the can. It was
then a simple matter using either a wire brush or some wire wool to remove the
rubber ash and remains from the threaded brass tubes. When they had been thus
cleand, I replaced the valve cores in the tubes and then pushed the tubes into
the bored rubber bungs. They work just great.
As a side issue, I was surprised at just how much brass there is in
these old car tyre valves. It might be an idea for a fund raiser to get
garages to collect them for your troop. You would of course have to remove the
cores and burn the rubber off to get the brass tubing. Burning the rubber
might be a pollution problem in some areas, perhaps there is also a chemical
solution to removing the rubber, bleach perhaps.
Cheers for now
Terry Howerton Sakima Group, Inc. SCOUTER Magazine Kansas City