What makes a master diver?

[GA Under Water]

Edited sorry.

 

[JeffG]

That's a fairly bold statement from someone who hasn't even been diving a year yet ...

... Bob (Grateful Diver)

Doesn't matter that he has been diving less than a year.

He is a Master Scuba Diver.

 

[GA Under Water]

That's a fairly bold statement from someone who hasn't even been diving a year yet ...

... Bob (Grateful Diver)

I have been called cocky before.

 

[MXGratefulDiver]

I have been called cocky before.

Fair enough ... but can you walk the walk?

Whenever you are ready to come test my knowledge/skills, I am waiting.

Well, since you offered, here's the test ...

Two divers are planning a dive to 100 fsw. Diver #1 has a consumption rate of 0.55 cubic feet per minute. Diver #2 has a consumption rate of 0.65 cubic feet per minute.

The dive plan is to:
- descend a buoy to 45 fsw
- follow a line downslope to a sunken boat at 100 fsw
- spend 15 minutes at 100 fsw
- follow the line back upslope to the buoy line
- ascend the buoy line, doing a 3-minute safety stop

Travel time from the buoy to the sunken boat at 100 fsw is 6 minutes. The same travel time applies on the reciprocal heading.

Question #1: How much gas will each diver need to do this dive?
Question #2: Assuming diver #1 is using an LP95 (working pressure 2640 psi) and diver #2 is using an HP100 (working pressure 3500 psi), what is the turn pressure for each diver?

Knowing how much gas you'll need to take with you is a fundamental skill involved in deep diving. This is part of a test I give my students in AOW ... I won't even ask you to get into working consumption rates and rock bottom, which they also have to do.

With your training, you should be able to come up with the answers easily enough ...

... Bob (Grateful Diver)

 

[Tigerman]

We've had this discussion lots of time on other threads but, IMO, not providing complete information to a boat crew can be a bad practice. The crew needs to plan their resources and make decisions that depend on evaluating the divers on board based on the information they have.
....

At the same time ive heard people showing a DM or instructor card and had to babysit other divers, which of course is not why you pay 100s or even 1000s of dollars for a dive vacation to do so that could be sent back to the dive ops having a bad practice too..

 

[MXGratefulDiver]

At the same time ive heard people showing a DM or instructor card and had to babysit other divers, which of course is not why you pay 100s or even 1000s of dollars for a dive vacation to do so that could be sent back to the dive ops having a bad practice too..

I never hesitate to show my Instructor's card on a vacation dive. The only time I have ever been asked to buddy up with a new diver, I politely declined. Anyone can, at any time, for any reason, decide not to dive with someone else. I simply told the DM that I was on vacation, and that unless they wanted to comp me the trip I would prefer a more experienced dive buddy. I ended up buddying with the DM ...

... Bob (Grateful Diver)

 

[stevewirl]

iv dived on hols showed my card and at the end of a dive the dm told me to buddy up with a ow who at 28metres of water had 10 bar left . paniced and a lift later gave out to me as he though he had loads of air .

iv done pleanty of dives and showed my active diver card and beeing buddied with aow and had great dives , i never show my card unless its deep . 40 meters +

 

[Tigerman]

Wonder why they didnt want to compensate you for the entire trip

 

[Thalassamania]

Fair enough ... but can you walk the walk?


Well, since you offered, here's the test ...

Two divers are planning a dive to 100 fsw. Diver #1 has a consumption rate of 0.55 cubic feet per minute. Diver #2 has a consumption rate of 0.65 cubic feet per minute.

The dive plan is to:
- descend a buoy to 45 fsw
- follow a line downslope to a sunken boat at 100 fsw
- spend 15 minutes at 100 fsw
- follow the line back upslope to the buoy line
- ascend the buoy line, doing a 3-minute safety stop

Travel time from the buoy to the sunken boat at 100 fsw is 6 minutes. The same travel time applies on the reciprocal heading.

Question #1: How much gas will each diver need to do this dive?
Question #2: Assuming diver #1 is using an LP95 (working pressure 2640 psi) and diver #2 is using an HP100 (working pressure 3500 psi), what is the turn pressure for each diver?

Knowing how much gas you'll need to take with you is a fundamental skill involved in deep diving. This is part of a test I give my students in AOW ... I won't even ask you to get into working consumption rates and rock bottom, which they also have to do.

With your training, you should be able to come up with the answers easily enough ...

... Bob (Grateful Diver)

And while your at it, what's your ascent plan and why? And what's your contingency ascent for one step deeper and one step longer?

 

[GA Under Water]

Question #1: How much gas will each diver need to do this dive?
Question #2: Assuming diver #1 is using an LP95 (working pressure 2640 psi) and diver #2 is using an HP100 (working pressure 3500 psi), what is the turn pressure for each diver?

rounded leaving about 500psi to spare.
d1 requires 66.35 cf
turn around 1103 psi

d2 requires 69.25 cf
turn around 1642 psi