Quote:
| Originally Posted by [b Quote[/b] (Bob Cooper @ Mar. 10 2003,17:17)]Mark
A few points...............
1.GUE, as a training, exploration and research organisation, doesn't *make* anything.
Those self inflating DSMB's are a bad idea for the following reasons:
1. They are too bulky
2. The valve can be opened slightly, or can leak whilst stowed, leading to a potential uncontrolled ascent
3. People often *forget* to fill them
4. The small cylinders are exempt from routine tests, leading to neglect and potential failure.
5. Cracking the valve and *letting go* produces far too much lift, leading to a potential uncontrolled ascent if a reel should jam.
6. They're expensive!
A closed lift bag/SMB can be inflated mid-water, at depth or on the surface, without these potential problems. Guess who makes these closed lift bags/SMB's? yes that's right....Halcyon.
Alternatively, it's a simple matter to make one yourself, using any kind of closed SMB. Much simpler, safer and smaller.
Best regards
Bob |
I can confidently say DIR started in the US that's why things have to be idiot proof. That's why the US army has nice pictures of how to operate their old rocket launcher > get the picture? That is exactly why DIR is against auto SMB's
The issue with leaving the tank partially open, etc is not very practical - Have you ever accidentally shut or opened the valve on your tank? Doubt it.
I use a lift bag all the time in current that is generally coming a good 400m above sea level. I'm talking about Rock Port on the St Lawrence River. It would love to have an auto SMB. I wish we could get them here. I have drifted 200 and 300 meters in 15 minutes, that's the sort of current I deal with at times and keeping steady isn't easy. We look like laundry hanging on the line at times.
Well done Mark Chase.
Take care
Lawrence