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In message <199611191033.VAA18599@ne*.hi*.ne*.au*>, anscott@hi*.ne*.au* writes >Does anyone know about a surface supply rebreather(semiclosed) called >SCANUBA? I think it's a French design. Is anyone using a surface supply >rebreather of their own? It was designed and built by a Frenchman called Jean-Claude LePechon. The system is a nitrox surface supplied semi closed system (although it can be utilized for trimix & heliox). The system maintains a PpO2 setpoint of 1.6 bar by virtue of the FO2 of the supply gas being variable and controlled by the divers depth. Essentially oxygen is delivered into the system from 0 to 6 metres (20 feet) and decreases as depth increases until it is zero at 50 metres (165 feet). Air is delivered into the system as the diluent, none is injected from 0 to 6 metres and it increases as depth increases. By matching the increase in air input to the decrease in oxygen input allows the system to deliver a near constant PpO2. The system delivers pure O2 during initail descent (6 metres) and decompression and a variable Eanx mix between 6 metres and 50 metres. Not sure as to the usefullness of such a system, bearing in mind it is surface tethered. (look at the trouble Comex had in Fontaine Vacluse!!). Contact Address for Jean Claude LePechon:- Hyperbarie 94 rue de Buzenval 75020 Paris France Regards Chris Hellas e-mail - chris@de*.de*.co*.uk*
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