jimclarke
Guest
In 1973 Fenzy (toilet seats) were replacing surface inflatable life jackets because in emergency they could bring you up from depth, the bottle being able to fill it at 90ft.
The surface type life jackets were being orally inflated underwater to give bouyancy compensation. (This risked bursting at the surace if the cartridge was used and half size CO2 cartridges appeared on the market) There then appeared relief valve kits to avoid that problem.
Fenzies were used to compensate for bouyancy using the bottle. The primary function as life jacket was not threatend by using up the bottle because most dives were square profile.
Although this is off subject
With the adition of a direct HP air feed to the Fenzy drain plug and the BC was very close.
Soon we had LP direct feeds and later these migrated to the oral inflator tube.
We had it all ...pony bottle ...an octopus substitute and BC in one..[/INDENT]
Back to the point beginners were not allowed to use Fenzies due to the danger of uncontrolled ascents! We managed with thin suits, rocks and weightd lines for deco stops.
The surface type life jackets were being orally inflated underwater to give bouyancy compensation. (This risked bursting at the surace if the cartridge was used and half size CO2 cartridges appeared on the market) There then appeared relief valve kits to avoid that problem.
Fenzies were used to compensate for bouyancy using the bottle. The primary function as life jacket was not threatend by using up the bottle because most dives were square profile.
Although this is off subject
The Fenzy also provided a pony bottle (emergency air) function. Pillar valve in right hand and oral inflator vale in left. The next develpoment was the AP mouthpiece, a mini plastic demand valve on oral inflator made this even easier.
With the adition of a direct HP air feed to the Fenzy drain plug and the BC was very close.
Soon we had LP direct feeds and later these migrated to the oral inflator tube.
We had it all ...pony bottle ...an octopus substitute and BC in one..[/INDENT]
Back to the point beginners were not allowed to use Fenzies due to the danger of uncontrolled ascents! We managed with thin suits, rocks and weightd lines for deco stops.