Gordon Smith

Gordon Smith (born Flin Flon, Manitoba, Canada 1950, died January 9, 2006) was an inventor, machinist and tool and die maker notable for inventing the KISS SCUBA diving rebreather.

The first attempt in 1998 was a novel approach, with a unique piston serving as counterlungs rather than the conventional flexible bags. The approach was intended to use tank pressure to compensate for the o-ring friction and intertia of the displacing water. Although the o-ring friction in air was acceptable, the model could not handle the inertia of the necessary water displacement. The prototype suffered from excessive work of breathing and did not pass test of surface breathing while submerged for even a few minutes. It got him started however, and nevertheless had the dubious description of "looking like R2D2 making love to an octopus" according to Gordon.

Gordon devised his fully closed rebreather system in 1998. One of his key contributions was to realize that the formidable electronics engineering required to automate control of the loop partial pressure of oxygen was neither required nor necessarily the best way to minimise the risk of hypoxia or hyperoxia. Instead, a constant mass flow orifice injected oxygen continually at a rate slightly under the divers basal metabolic rate - requiring only periodic top-ups by the diver. This was the KISS principle, the philosophy by which the diver was counter-intuitively made safer by removing electronic protections. Specifically, design philosophy was that the knowledge that the diver was the one and only thing controlling the loop oxygen level meant that attention was required and would be applied. This avoided the human tendency to eventually neglect to monitor the machine-controlled process outputs, which work seamlessly until there is a failure or mistake (whether software bug, miscalibration or other issue) and then cause an accident. In practice, the constant mass flow of oxygen meant that partial pressures changed so slowly that this form of manual control was actually very feasible and only required checking every few minutes (more often during exercise and when close to the surface perhaps). He developed a successful prototype, initially using two oxygen sensors in two separate larger blocks. With the availability of miniature readouts, he advanced the design to use a triple oxygen sensor system in order to allow there to be a "voting ability" for which sensor was malfunctioning if there was an error in one. He continued to innovate, including at one time experimenting with a "hands-free" tongue-based oxygen injection system he wryly called the "snog valve". He then perfected the system over several years, building further prototype units that were test dived by friends Natasha Dickinson and Daniel Reinders. In time he came to see the potential for commercial sales of the system, and began Jetsam technologies. Over time, he would begin to explore also a smaller recreational-sized version of the KISS rebreather as well. He also pursued a pneutmatic air compressor system for rebreathers, whereby partially full standard scuba tanks could be used to top-up the smaller rebreather tanks without the need for a motorized compressor.

Gordon Smith, along with friends Natasha Dickinson and Daniel Reinders in 1996. The number of scuba cylinders involved in each trip was a significant part of his motivation to switch to rebreathers for dive trips.

Gordon Smith left Comptec in 1989 to start Kiss Manufacturing. In the late 1990s Gordon invented and began producing the KISS line of diving rebreathers under the Jetsam Technologies name.

Gordon Smith was trained as a tool and die maker at C. A. Norgren, Littleton, Colorado. He returned to Canada in 1975 and went to work for Comptec International Ltd., a two color molding company, in Vancouver, British Columbia. Gordon Smith spent fourteen years at Comptec and moved from the position of Mold Maker to become manager of the Tooling, Engineering, and R&D departments. During this period he was responsible for increasing the machine operator output by a factor of 6. He also helped move Comptec into the telecommunications business and developed production systems for assembly of telephones which are in use today by almost every major telephone manufacturer in the world.