much fun was had by all. mark taught me and liisa how to operate the inchworm (for the show in august) and we also got to run the v1 which is a replica of the first guided missile -a buzz bomb engine the germans built for wwII

youtube.com/watch

the sound is from the valve bank inside at the other end of the barrel. the low frequency vibrations give you an internal organ massage if you stand alongside it. if you stand diagonally in front of it, your eyeballs and tonsils will oscillate.