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Matsya
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MikeFerrara:
http://www.bsac.org/techserv/irc/6dsmb.ppt#342,2,Introduction
Indeed it is after all our sausage !!!!!!!!!
What is a delayed SMB?
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http://www.bsac.org/techserv/irc/6dsmb.ppt#342,2,Introduction
Indeed it is after all our sausage !!!!!!!!!
We use DSMBs a lot in the UK.
They are what you call "Safety Sausages", but they are designed to be deployed later on the dive.
An SMB is any marker visible on the surface and may be sausage shaped, round, torpedo shaped...
A DSMB is sausage shaped and is easily filled with gas underwater, they may be open ended, semi-closed or closed.
Open ended are a royal pain in the ***** as they can deflate at the surface, in the UK the most common DSMBs are the semi-closed, most notably the Buddy/AP Valves DSMBc and DSMBci.
The DSMBc is inflated by blowing gas (from exhaled air, octopus or blow gun) into the open end, as it inflates a baffle-system is closed by the increasing air pressure and prevents the tube from deflating. An overpressure valve prevents over-filling as the marker ascends and allows you to deflate it post dive.
The DSMBci is the same, but has it's own small (0.1 or 0.2l) "crack" bottle that makes the unit self-contained (so long as you remember to refill the bottle!), with this you can either fill slightly, close the bottle and allow expansion on ascent to fill the marker tube - or "fire and forget"
Closed circuit DSMBs are filled through a LP valve from one of your LP hoses (often drysuit feed).
Common UK terminology for deploying a DSMB is "bagging off", "shooting the bag" or "shooting the blob".
HTH
Dom
They are what you call "Safety Sausages", but they are designed to be deployed later on the dive.
An SMB is any marker visible on the surface and may be sausage shaped, round, torpedo shaped...
A DSMB is sausage shaped and is easily filled with gas underwater, they may be open ended, semi-closed or closed.
Open ended are a royal pain in the ***** as they can deflate at the surface, in the UK the most common DSMBs are the semi-closed, most notably the Buddy/AP Valves DSMBc and DSMBci.
The DSMBc is inflated by blowing gas (from exhaled air, octopus or blow gun) into the open end, as it inflates a baffle-system is closed by the increasing air pressure and prevents the tube from deflating. An overpressure valve prevents over-filling as the marker ascends and allows you to deflate it post dive.
The DSMBci is the same, but has it's own small (0.1 or 0.2l) "crack" bottle that makes the unit self-contained (so long as you remember to refill the bottle!), with this you can either fill slightly, close the bottle and allow expansion on ascent to fill the marker tube - or "fire and forget"
Closed circuit DSMBs are filled through a LP valve from one of your LP hoses (often drysuit feed).
Common UK terminology for deploying a DSMB is "bagging off", "shooting the bag" or "shooting the blob".
HTH
Dom
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