Talk to me about the Conshelf XIV Supreme

[Nemrod]

I think you're right about the mechanical advantage but not about the venturi assist. Smaller case=less volume=faster air flow through the case=more venturi, assuming everything else is the same.

I suspect case fault geometry is practically the same on the two, but I don't know for sure.

I understand but what I was thinking is that since the diaphragm is smaller on the A700 and the purpose of the Venturi is to assist pulling a vacuum to sustain the deflection of the diaphragm, all things being equal, the larger case and the larger diaphragm most particularly, the G250/G260 Venturi should be more effective. But, perhaps not.

N

 

[redacted]

I was looking for a A700 schematic but I don't have one. For some reason I seem to remember that it uses the same poppet as the X650 which was sort of a strange replacement for the D series, so it doesn't surprise me that the aspirator is similar.

Yes, it does look like a shorter s-wing poppet. Try this video:. http://www.scubapro.com/A700/en/A700-Second-stage-in-detail-3D.asp

 

[oldschoolto]

I understand but what I was thinking is that since the diaphragm is smaller on the A700 and the purpose of the Venturi is to assist pulling a vacuum to sustain the deflection of the diaphragm, all things being equal, the larger case and the larger diaphragm most particularly, the G250/G260 Venturi should be more effective. But, perhaps not.

N

I wonder if Shark1 is still reading this thread... And understanding how much you guys (not me) know about regulators and how little his tech does...

Jim...

 

[TheShark1]

It's a shame there's not an all-metal g260

 

[Nemrod]

It's a shame there's not an all-metal g260

I would have no particular qualms with purchasing the SP G260 or the Halcyon G250 clone or a cared for SP G250. I think I would prefer the Mk17 first.

 

[TheShark1]

SP advertises their A700 as their top-shelf 2nd stage. Better breathing than the S600 or G260, they claim.

 

[buddhasummer]

It's a shame there's not an all-metal g260

But isn't that something your "tech" commented on re the Conshelf and that you were concerned about? Can't imagine an all metal G260 would be any lighter than a Conshelf, in fact I'd imagine heavier given its larger size.

 

[halocline]

It's a shame there's not an all-metal g260

There is, it's the 109 or balanced adjustable. I've mentioned it a few times.

 

[TheShark1]

There is, it's the 109 or balanced adjustable. I've mentioned it a few times.

Can I get it new?

 

[TheShark1]

But isn't that something your "tech" commented on re the Conshelf and that you were concerned about? Can't imagine an all metal G260 would be any lighter than a Conshelf, in fact I'd imagine heavier given its larger size.

I'm not concerned about weight.