The one thing that scares me with the tennis ball launcher is the risk of the plastic air reservoir exploding - probably not a problem with new pipe but as the pipe ages I would expect the pipe to become brittle and that brittleness may not be easy to detect until it is pressurised.
The sling-shots do have the problem of the rubber tubes perishing - but a visual check will easily detect this. David G4FTC _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
