Quote:
| Originally Posted by The_blue Would someone with a little spare time fancy working out what the minimum bar pressure would be to inflate a blob at say 10 meters? |
Fully inflate at 10M or inflate enough at 10M for it to be full at the surface?
Quote:
| Originally Posted by John63 Need to know the volume of the SMB to do this as it is dependant upon the volume of gas required |
As John says you need to know the SMB volume and, as you asked for a value in bar, you also need to know the size of the supply cylinder.
A quick hunt on t'internet turned up an average SMB (an Agir one) with a lift value of 15Kg. I
think I'm right in saying that equates to displacing 15L of water and, whilst not absolutely accurate I think* it's fair to use that as the amount of gas you need for it to be full at the surface.
As John says the volume of gas in the blob is going to double from 10M to the surface, so 7.5L at 10M should give you a full blob at the surface. However if you've got a 0.1L crack bottle, then by my reckoning you're going to need to use 7.5/0.1 = 75bar to get 7.5L in.
If you're using a drysuit hose fed from twin 12s then you'll need 7.5/24 = 0.3 bar
* Though I'm sure the more knowledgeable on YD will be along soon enough