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Use of Fieno Test finished ... The mixed gas Fieno system (40% oxygen, 60% nitrogen) is a different system to the usual one used for scuba diving. A diver who is used to scuba may need to make small changes to his technique but once used to the system should have no problems. Compared to scuba equipment there is resistance so it is said that you must breath very hard to use this type of equipment. Apart from that, if you have your senses then you should have no problems. In the water you are able to work and perform athletic acts. Because there is no "gobogobo" scuba sound you can get much closer to fish and they are no frightened away. Because of the light weight (about 1/4 f normal scuba gear) and the compact nature of the unit it should be a good selling point. Although the unit tested was not a full production version I was very impressed with it. There were some bad points but the unit exceeded my expectations. I look forward to the day when we will all be able to use this type of equipment. How long can you stay under for ... When using the Fieno (and doing normal diving) consumption of gas is fixed. That is to say that underwater time is also fixed. "Normal diving" is when the demand valve is not used very often. When you press the start button on the Fieno a fixed amount of gas is released from the small 1.3l tank (5 litres per minute). This gas goes from the hose to the mouthpiece and the unused part of the gas is returned to the air bag. The air in the system is used over and over again but when the mouthpiece is purged, mask is cleared or the BCD inflated gas is lost from the system. In these cases the demand valve will be brought into action. In this way, if you use the demand valve a lot then the gas in the system will decrease very rapidly and dive time will be short. On the second dive (depth 15m) after doing mask clear and using the BCD the dive time was only 25 minutes. If you were to efficently use the gas then 30 to 40 minutes should be possible. On a dive when the demand valve is not used you should be able to dive for more than 50 minutes on the 1.3 litre tank (tank is 1.3 litres of mixed gas at 200 bar). Even a dive to 30 metres should not require the use of the demand valve. One difference between the Fieno system and scuba is that there is a fixed limit of 5 litres per minute and this does not vary with depth. There may be a problem that there is not enough gas available for the diver but on this test the reviewer finned violently and did not experience any problems. Well, there you have it. That's all the info I have for now. Please remember that while I did try my best, my best is sometimes not good enough. I hope I did not make any massive errors in translation.
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