gordonscuba
Contributor
For the purpose of this thread, ie. solo diving with a primary tank and a pony bottle, the pony bottle can be sidemounted in such a way that the diver's front is still quite clear and the pony bottle doesn't interfere with any of your photography or hunting equipment. If done properly, it doesn't come around to the front of your body and allows full range of motion for your arms. The pony's regulator is then secured to the pony tank by looping its hose through bungees or rubber bands, as has been illustrated elsewhere (google "stage bottle rigging"). I think the people who complain about wanting "to keep their front free", possibly didn't spend enough time understanding how to rig a bottle properly on the side.
In the sidemounted pony configuration, one can visually trace the full path of the pony regulator hose from its source on the first stage, to the second stage mouthpiece at any time, whether or not it is in use. This configuration also has numerous other advantages, some safety-related and some convenience.
1. In the event of a pony regulator failure (leading to permanent freeflow) during the dive -- which now you see immediately -- you can simply turn the pony tank valve off and continue the dive as normal (it's not considered an emergency). In this situation, if you needed to switch to the pony, the gas in the pony would still be available to you (by feathering the valve).
2. You can easily see if the pony regs + spgs are leaking (even in a small way, such as indicating a failing o-ring) at any time during the dive.
3. (Convenience) at the end of the dive, you can unclip the pony and hand it up.
If you do it this way and then at some point in the future you decide to progress to technical diving, you'll already be familiar with rigging deco / stage bottles.
In the sidemounted pony configuration, one can visually trace the full path of the pony regulator hose from its source on the first stage, to the second stage mouthpiece at any time, whether or not it is in use. This configuration also has numerous other advantages, some safety-related and some convenience.
1. In the event of a pony regulator failure (leading to permanent freeflow) during the dive -- which now you see immediately -- you can simply turn the pony tank valve off and continue the dive as normal (it's not considered an emergency). In this situation, if you needed to switch to the pony, the gas in the pony would still be available to you (by feathering the valve).
2. You can easily see if the pony regs + spgs are leaking (even in a small way, such as indicating a failing o-ring) at any time during the dive.
3. (Convenience) at the end of the dive, you can unclip the pony and hand it up.
If you do it this way and then at some point in the future you decide to progress to technical diving, you'll already be familiar with rigging deco / stage bottles.