Hammerhead in open water

Monsta

Aaaah yes, Joe, that could be the case! Thanks a lot!

But I´m still wondering why the time i have to spend on one stop is getting longer instead of getting shorter. As you mentioned the deco is calculated on the currentloop content which definitely is leaner on 9m than on 3m. If the deco is calculated on a leaner gas the stop with a richer loop content should be shorter.

Maybe my technical english now is at a point where it´s getting harder and harder for me to explain what really happened

Martin

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jradomski

You also have to take into account that there is a pressure difference.. The TTS assumes you are at the pressure its requesting, so there will be a gradient difference based on a pressure change, and of course the biggest changes are from 10m to the surface..

when you are at 3m your TTS should be almost perfect, the deeper you get it USUALLY shows a greater time, but at these intermediate depths your fighting loop PO2 vs the pressure gradient, as time progresses there is a smaller driving gradient, so pressure begins to override the loop content.. At the start of a stop, Oxygen content has mopre of an effect, as the gradient differential nears equality, the pressure has a greater effect than the oxygen content.. Thats why you will see it counts accurately until the last minute or so..

You see this effect much less when you use a less conservative GF high becasue you are still in the area where at each half time you are still dropping a reasonable loading, the lower your overall tissue load is the slower the gas wants to leave your tissues.. at a 10/100 there is very little extra "time", as the gf high goes lower this is extended..

When you go up to the next level, you are immediately increasing the off gassing gradient.. What I suggest if you want to do your last stop at 6m is do it until it says one minute left, then ascend to 4.5m, and it will probably clear almost immediately, if not wait 1 minute and procees to 3m and do the same..

If you actually worked out the profile that you were forced to do, you would find that its pretty damn close to a profile generated using desktop software and telling it that your last stop was 6m.. For it to generate a real accurate TTS for ending the deco at 6m, it would need to know that was your last stop..

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Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

edasque

Haven't gone through training yet but just bought my unit today. Is it possible to set the deepest stop to be 6m in OW on the HH handsets ? I don't very much like stops at 3m in new england waters.

Silly questions I know but scanning through the reference manuals I couldn't find any mention of it.

diverreb

I don't believe you can, but John & I were just talking about the same thing the other day and it should definitely be considered for a future upgrade on the software.

A stop at ten feet is not the norm when the seas are choppy up here in the Northeast and it would be a great feature to have the option to set the depth of the last stop.

Richie

heyydude

Originally, we had the last stop deeper - but the English guys who dive Quarries complained that it was too deep...

We will add this request to our List, and one day, it will show up as a "Cool New Feature".

Thanks for the input.

Kevin Juergensen
Juergensen Marine, Inc.

edasque

Thank you, it's good to see that the manufacturer is listening.

louisrankin

Another vote for 6m stop, don't blame the English who would listen to a English Quarrie diver I believe they are a sub species of DIR (DIQ) Dive in Quarrie

Most UK divers dive in the sea where it is cold crap viz but the best wreck diving in the world (IMHO)

edasque

Well, it could just be an option like on the VR3 where you can set the shallowest stop to 3m, 4.5m or 6m as you wish

JCdesign97

Well as long as we're voting I'll cast mine for the 6m stop, as well. I was out in the Atlantic on Sunday and it took 3 or 4 minutes at or above 10' to clear the last 1 minute stop. Fortunately we were blessed with a flat sea and little current so it wasn't a problem and I understand the theory from JoeR's earlier replies; but being able to clear down below the worst of the surface effects would be a major plus ... on both sides of the pond!

Not a complaint, mind you - I am very impressed with the function, user-friendliness and ruggedness of the HHs thus far.

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Cheers,

John Cogan

louisrankin

Anyone know how to do a poll?

Would you like the functionality to change the last stop in the Hammerhead?

I sure Kevin would listen it would also be good to get a more accurate TTS on deep and long dives or has that been fixed with the new version?