Archive for Contrapel

Contrapel Water Jet

Two New Zealand inventors (Barry Davies and Paul Paterson) have spent nearly twenty years developing a contra-rotating water jet. Like contra-rotating propellers, the Contrapel waterjet uses two impellers turning in opposite directions. The original efforts were by a firm called ContraJet Ltd. After that effort stalled, it became PropellerJet Ltd. The water jet research and […]