Silly question- pull dump

[David]

Originally Posted by MarkP

Er, what's any of this got to do with springs? I thought the argument against shoulder pull dumps is that you stress the most critical part of the BC when you use them.

pulling it off not the spring...

[TerryH]

Originally Posted by Treerat

I know the feeling, I've been tempted to change the one on the halcoyn but never seem to get there.

You might want to check where hose connects to the elbow on the shoulder.
There is a bad design flaw that could mean the hose comes off in your
hand. With no wire to act as a strain gauge any heavy handed use of the
hose could be a disaster.

[Keith Whittaker]

Having dived with rental BCD's for ages, all of which had pull dumps, imagine my suprise on the first outing with my shiney, new Halcyon when I pulled the hose and the bloody thing came off in my hand!

[Captain Calamity]

Originally Posted by TerryH

You might want to check where hose connects to the elbow on the shoulder.
There is a bad design flaw that could mean the hose comes off in your
hand. With no wire to act as a strain gauge any heavy handed use of the
hose could be a disaster.

The wire didn't save me - I think the Halcyon is probably more robust as it has a proper clamp, not just a cable tie like my old BC. Besides, without the shoulder dump I don't feel the need to repeatedly tug my hose as it were.

CC

[Miss Roxy Chablis]

A vital piece of your "critical life support system" (I'll claim my £5 now for the DIR bullshit bingo ) that is held together with cable ties and other relatively fragile points and Woz wants us to yank at it all the time

What could possibly go wrong?

The new Halcyon Vagina is currently undergoing beta testing on GUE Projects and "Missions" worldwide. We've got rid of all the curly hairs - they were affecting the "hydrodynamics" (Ching another fiver) of said Jack and Danny and were frankly an entanglement hazard. The weak fleshy structure has been replaced with an almost indestructible all new RF welded Cordura construction in a fetching shade of black.

Oh and we've got rid of the hole - it was an obvious weak spot and as any man who's been married for more than six months will tell you - it's entirely vestigial anyway.

Rather than the usual "Stealth" Limited Edition - we will be offering a Team Hecate Limited Edition where the hole has been re-instated and now contains one of these:

[Woz]

Mine's got proper clamps and a wire running down the middle to take the strain. Mind you I couldn't get the bastard OMS one off the wing (even with the correct wing tools) so the original elbow is staying put. Although I have a Halcyon inflator on it to look all cool and everything. Minus points for having the hose long enough to tuck under my drysuit feed hose, though.

Stroke? Like a petting farm full of 5 year olds with fluffy ikkle bunny wabbits.

[TerryH]

Originally Posted by Captain Calamity

The wire didn't save me - I think the Halcyon is probably more robust as it has a proper clamp, not just a cable tie like my old BC. Besides, without the shoulder dump I don't feel the need to repeatedly tug my hose as it were.

CC

Look again.

The old cable tie works because the hose already has a built in ridge that
goes over a flange on the plastic elbow fitting. With this acting as a
pull-stop, a single cable tie is sufficient.

On the other hand the Halcyon has almost no ridge, and no moulded stop.
All that's holding it on is that clamp. If you look closely you'll see that it
has its own stop and cant close further than a set diameter, stops it
crushing the tube.

The cable tie/ridge/flange effort is definety more robust then the clamp.

[jhewitt]

There must be something to having a pull dump on a wing cos loads of OMS users have altered theirs once they found a Red Hat Diving assembly fit perfectly.
I still have a plain elbow though. If there is nothing to go wrong then it probably wont. If there is something to go wrong then it probably will.
Does Scubapro still fit those silly clamps on their BCDs. I pulled the hose off on one once to dump and haven't used a pull dump since.

[Turtle Dude]

Originally Posted by Woz

Oooooo I could have a single bladder and 2 hoses. That would be the ultimate strokery.

I used to have this, as Apeks sold Zeagle Wings with an additional Apeks inflator on the bottom of the RHS of the wing. Most unusual. But kind of useful running it off the pony.

It went when I finally replaced/serviced the Wing recently. However the Zeagle does have the pull dump as standard... however, I always forget it is there and never use it that way! dooooh.

[Brian of Aquanauts]

Originally Posted by TerryH

On the other hand the Halcyon has almost no ridge, and no moulded stop.
All that's holding it on is that clamp. If you look closely you'll see that it
has its own stop and cant close further than a set diameter, stops it
crushing the tube.

I can't comment on older wings but the elbow most certainly has a ridge and the hose is clamped extremely firmly. The rubber hose is crushed into place, and is not even glued.

I tested it below, pulling as hard as i possibly could, i reckon it was equivalent to about 30-40kg. The hose did not even move by a fraction of a mm along the elbow joint.

This is an evolve 40: