Negative entry vs Using a downline

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You keep trying to tell me what I think and why I think it. Very curious.

Different types of scooters handle differently in the water. It makes a fairly considerable difference in speed and handling depending on what type you are using. Since you don't even know what it was it's tough to have any sort of conversation.
 
Same for us. If we don't need it, we don't take it.
All these misconceptions.
I thought I was beginning to understand, but now I'm getting confused again. Your description of what you do in Cozumel makes perfect sense to me (even the bit about the swim suit!). But if your DIR team buddy was TSandM, who likes (but does not *need*) her longhose and would like to practice (but does not *need*) with her twinset, does that mean that your configuration will trump hers on the principle of Standardisation?

(good thing Exposure suits aren't standardised, or the swim suit will have to go too!)


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I don't know. I've not been DIR trained, so I don't how rigorously the principle of 'Standardisation' is applied. I've just learnt from TSandM that Standardisation doesn't apply to exposure suits. To me that is quite interesting because I would have imagined that does make a difference in a tech situation.

As a non-DIR heathen I am embarrassed to admit that in nearly all my rec diving experience I have not dived with a reel. I can count the numbers of times on the fingers of one hand. That is because I do subscribe to the minimalist approach - if I don't need it, I don't take it.



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The basic reel a diver would carry would be a finger spool with about 100' of line (may vary) used for shooting an SMB from depth. This can also be used as an upline, or for hanging a deco stop (when attached to the bag) or for doing a quick sweep search in low vis. Often kept in the pocket, ether attached to the SMB or not.

A larger handled reel with varying lengths of line can also be used for penetration dives (or as a guide in low vis). Usually clipped off on the butt D ring or some other out of the way spot.

A rec diver may have a finger spool, but not a handled reel. At tech diver may have both, or multiples thereof.

Even the most ardent diver would be hard pressed to justify carrying a large reel on a rec dive (unless one were training) though for many rec dives a finger spool can be very valuable.
 
I thought I was beginning to understand, but now I'm getting confused again. Your description of what you do in Cozumel makes perfect sense to me (even the bit about the shorts!). But if your DIR team buddy was TSandM, who likes (but does not *need*) her longhose and would like to practice (but does not *need*) with her twinset, does that mean that your configuration will trump hers on the principle of Standardisation?

(good thing Exposure suits aren't standardised, or the shorts will have to go too!)


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I have a longhose too, of course. That's a central thing to dir.

If she wants to practice in her twinset, ok. Doesn't really change anything in the water for me or her. All the procedures are the same with twins or a single tank.
 
If she wants to practice in her twinset, ok. All the procedures are the same with twins or a single tank.
OK thanks. So tank configurations and exposure suits are not a strict part of Standardisation.



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I am loving this DPV argument :D For the record, you cannot get further from DIR than me.

That said, this guy's focus on relative speed could not be more wrong. It's not about how fast an extremely streamlined olympic swimmer can go, and it's not really about how fast the DPV will drive you through the water (though as a Genesis owner, I can tell you that 300ish fpm makes everything hanging off you try very hard to fly away...I had to put inline shutoffs on my BO bottles and usually wind up holding the DSV in my face even with the gagstrap). That's all about the forward movement and resulting backwards drag force.

What's at issue here is how much force from rearward-directed thrust has to be applied to one small attachment point on the diver to generate that 200-300 fpm of forward movement. In the case of the Genesis DPV, we're talking 90+lbs of thrust (100+lbs of thrust if you can lay hands on the military version of the 1500, the SW). I don't care if you're wearing a BCD that's custom tailored to you and then Aquasealed to your wetsuit: you clip a Magnus or a Genesis to a D-ring on that BCD without a crotch strap and jam on the gas, and you'll have a lot of material around your chin in short order. Hell, even with a 7mm suit and a 2" soft webbing strap it's still un-fun enough that people are replacing crotch straps with custom split-seat harnesses to spread out the force your ass/crotch (not some other part of the harness) is anchoring.

Anyone can fly a scooter around underwater, but that doesn't change the laws of physics and BCDs are not designed to handle the forces generated by DPVs. Can you do it at a low enough throttle setting for awhile? Sure, I hand my DPV off to non-BPW wearing buddies all the time because it's a stupidly fun tool/toy. But never have I seen one of them handle it at full throttle without worrying about how it moved their :censored: around.
 
OK thanks. So tank configurations and exposure suits are not a strict part of Standardisation.



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For most diving you're correct. For more advanced dives, having the same tanks really helps with logistics.
 
BSAC haven't banned hog looping. They have just banned teaching hog loop/primary donate in general. Half of my BSAC club hog loops when they're on twins. I hog loop all the time (twins or single). I have yet to confuse anyone with my rig, even trainees on their first open water dives.

Well, it's been a while. They found something about it disconcerting enough to make some sort of directive regarding it. Again, I'm not defending the rationale - just saying there was something there.

As for not confusing. I respectfully disagree. Take a new diver, extremely task loaded and trying to remember and manage many skills and suggest two completely different systems of donating regs. Something I would not do. Again, not looking at it from my perspective (I get it) but from the new divers perspective. Substitute rusty/occasional vacation diver and I feel the same. I would say most posters here don't fall into that category so it's easy to forget how overwhelmed new divers can get by what we consider run of the mill.

The biggest hurdle in using a longhose is not the configuration itself as much as getting used to removing the primary reg from your mouth in times of stress. Without familiarity and comfort in this skill the longhose becomes potentially dangerous because the donator becomes instinctively protective and will balk at giving it away. You have to train past that instinct. Insta buddies don't usually do training dives before doing operational dives. What they know, is based on what they were taught, which rarely is primary donate.

What about hose trapping? Do we explain that to the other diver or not because they are not wearing the rig. But then, aren't we encouraging poor behavior by allowing people to dive with people with systems they don't understand. One dir tenent being, everybody is on the same page.

So, we could say that doesn't matter because you are donating and the taker doesn't care where the reg comes from but there are also times when the taker needs to just locate and take the reg - hence why mainstream agencies teach the triangle and dir divers practice low/no vis donation. Any mainstream diver, properly trained, should be able to access any similarly configured divers reg without communicating with that diver... but not a hog rig. The diver will instinctively go for the bungee'd B/U unless that response is drilled/trained out of them.

New divers also don't complain about things they are uncomfortable with because they are already so uncomfortable. Where would they start. They just nod and say fine and do "trust me" dives.

...downline

---------- Post added April 10th, 2014 at 06:42 PM ----------

Sure, I hand my DPV off to non-BPW wearing buddies all the time because it's a stupidly fun tool/toy. But never have I seen one of them handle it at full throttle without worrying about how it moved their :censored: around.

Good post but I think this all began when J said being configured dir meant something special when a new diver started scootering. I think we can all agree that you probably don't hand off a high power DPV and tell the new guy to gun it on dive 1. In that regard, most divers can handle the initial introduction without having a BP/W.

Found it: The “standardization” begins with the Back Plate/Wing, continuous harness and 5 D-rings (L Shoulder/R Shoulder, L hip, 2 on the crotch strap), paddle fins, long hose and necklace reg on a down-stream regulator (don’t think I forgot anything). Everything else is added for the particular dive and when added put at a standard location for reasons of functionality. And if you decide to add a scooter or maybe a stage/deco bottle you don’t have to immediately alter your configuration, you muscle memory is already set. You don’t have to “re-learn” everything every time you add a new piece of gear.

How your muscle memory can already be set if you've never used a scooter is beyond me unless what he meant is your muscle memory of everything else. Which brings up the other point I dislike; having to configure yourself in such a way as to be able to eventually do things you may never, or rarely, do. A lot of the dir kit is based on canlights, stages and scooters - something most rec level divers do not use.
 
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The Jesus comic was not the issue at all....it is the over-riding religious fervor over so many threads....not religion in the sense of Catholicism or Judaism or Buddhism or any of the other big ones....but in the sense of people getting seriously upset when someone suggests their belief is not the ONE TRUE PATH.

You're the one who was suggesting that your way was the ONE TRUE PATH ... back in the 9th post of this thread ... ascribing the use of descent lines to the domain of lazy boat captains and divers with inadequate skills.

Dan, sometimes I think you're incapable of seeing any method of diving except exactly and completely the way you would choose to do it.

It's a big world out there ... you should really get out and experience some more of it before making statements like the ones in that earlier post of yours. Or not ... it tends to make lively conversation.

As for the DIR train wreck ... I think I just skipped about 4 pages of posts, as I doubt there was a single thing said that hasn't been posted on other DIR threads in the past.

... Bob (Grateful Diver)
 
Irrelevant.

3.4 mph isn't fast. Sorry, but that's a fact. And that's with a minimum-rigged diver. As PfcAJ pointed out, tech divers are much slower due to your gear. His 200 fpm is only 2.3 mph.

The current in Coz generally runs faster than this. Sometimes the truth is just painful.

Tell me how this is so difficult of a skill...or are you just portraying the typical "my gear is super-awesome, and you can't handle it" attitude? We've already seen PfcAJ state that I'm not an experienced diver because I'm not DIR and don't use a scooter.

For some perspective, here is a video shot on a scooter on Juno Reef...one of the reefs you will probably want to visit when you are in Palm Beach on your upcoming trip.
You can see your speed relative to the bottom, and it would be much faster than Mark Spitz would be swimming with a tank and BC, unless he wanted his 40 minute dive to last about 8 minutes before he breathed his tank down to 500 psi....While it is possible to swim at this high rate of speed if you are an elite athlete--doing this means breathing at a very high heart rate, and having your huge aerobic system sucking down an enormous volume of air....
The scooter alternative will allow you to do an exploration run, or tour of a large area, while keeping your heart rate at 60 beats per minute--or whatever resting hr is for you. Your gas reserve becomes huge, and your nitrogen saturation will be lower...Scooters are actually about allowing a bigger adventure--they are more than just a fun toy--which they are as well :)
[video=youtube_share;GR8kxkFcU-Q]http://youtu.be/GR8kxkFcU-Q[/video]

This was shot on my Gavin....which is slowed down by having a huge camera and lights on it....and there are scooters much faster than a Gavin...though the Gavin would make a Blade and most recreational scooters seem like they were turned off :)
 
https://www.shearwater.com/products/teric/

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