But it was a very necessary skill.
twinhose regs and H-valves..anyone ever tried this combo?
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Oh yes, i agree, and remember it being slightly harder ((sarcasm intended)) than the standard today, hence the technology statement.
Heck Walter, who knew any better back then? Someone predicting todays equipment to you back then would have gotten laughed out of most rooms.
pescador775
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Since divers are constantly changing position and attitude I don't see any merit in trying to trim out like a submarine. If you can do it, fine, but whatever trim allows the diver to move in three dimensions without constant air injection, bleed or frantic pedaling will be OK with the double hose as with any reg. There are, however, a couple of training considerations, at least there were in the early days, now it's just one. Before the invention of the non return valve the diver had to practice roll clearing where the diver rotated to the left and exhaled stongly. This is no longer a consideration with anything manufactured after 1956. The diver may still experience some buddy issues with the US Divers reg. This regulator uses very soft and relatively short hoses. When the loop is stretched outward to allow the buddy to take a breath it is possible to pinch the hose closed. Again, this is due to stretch and flattening of the hose. If he seems to be turning blue that is the reason.
First time use with one of these regs may produce a feeling of air starvation, especially when working hard. This is due to breathing resistance caused by the back position of the regulator box. Be aware that the actual air delivery of the typical brand name double hose such as your Voit or USD is up to 30 cfm. They can be dived to 300 feet without overbreathing in normal circumstances. You cannot breath faster or deeper than this type of regulator can deliver although it may feel like it at first. The famous Conshelf single hose regulator uses a first stage copied from the double hose R.Aquamaster. The air passages and valving are the same. One difference, the long LP hose is a constriction point not found in the double hose. However, the ambient breathing hoses of the double hose produce some resistance so it is a wash.
A summary of breathing variations of the double hose: easy breathing in the vertical, harder breathing in the horizontal and head down position. Overbreathing (pos press) in the horizontal, face up position.
Edit: OK, I thought of a couple more. Surface swimming, the double hose mouthpiece will bob up and feeflow. Some divers loop their arm through the hoses to prevent this. The Nemrod hoses are longer and tougher and make this easy. If you don't have enough air in your lungs to clear a flooded mouthpiece, raise the mouthpiece and it will freeflow.
First time use with one of these regs may produce a feeling of air starvation, especially when working hard. This is due to breathing resistance caused by the back position of the regulator box. Be aware that the actual air delivery of the typical brand name double hose such as your Voit or USD is up to 30 cfm. They can be dived to 300 feet without overbreathing in normal circumstances. You cannot breath faster or deeper than this type of regulator can deliver although it may feel like it at first. The famous Conshelf single hose regulator uses a first stage copied from the double hose R.Aquamaster. The air passages and valving are the same. One difference, the long LP hose is a constriction point not found in the double hose. However, the ambient breathing hoses of the double hose produce some resistance so it is a wash.
A summary of breathing variations of the double hose: easy breathing in the vertical, harder breathing in the horizontal and head down position. Overbreathing (pos press) in the horizontal, face up position.
Edit: OK, I thought of a couple more. Surface swimming, the double hose mouthpiece will bob up and feeflow. Some divers loop their arm through the hoses to prevent this. The Nemrod hoses are longer and tougher and make this easy. If you don't have enough air in your lungs to clear a flooded mouthpiece, raise the mouthpiece and it will freeflow.
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