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Originally Posted by azapa
Back to BTV. Thanks Pete. A couple of points:
- you mention that you can do BTV. Do you always EQ that way or do you resort to pressurization methods sometimes? When?
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I use it a lot during FRC diving recreationally, especially no fins. But I have been lazy with it of late. The deepest I've done it is to 40m without using Frenzel (full inhale with packing years ago). Have not tried FRC depth limit with BTV.
My main eq technique is: mouth fill at surface (keeping tubes open and exerting constant pressure with tongue/jaw/cheek compression), then mouthfill at 15-18m (same thing) for the rest of the way down. But that requires a lot of concentration, so when I'm playing around, I'll use plain frenzel or BTV with FRC. The range of BTV without thinking too much about it is about 10 metres. Keeping ears open at the surface is especially important since that's where the biggest change in pressure happens and if your e-tubes narrow too early, it's hard to keep them open deeper down.
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- you mention that you see nothing moving in the mirror? Nothing at all? Please check
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I stand corrected. I see a slight twitch of my uvula (dangly thing at the back of the throat) and the back of the tongue. But when I really isolate the opening of the E-tubes and resist the yawning reflex, it is a small tremble,not a muscle contraction of the uvula, mainly. Very interesting.
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- when you refer to reverse EQ are you talking about holding your nose and reverse packing? I don't quite get it, sorry.
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Yes. But do not pressurize/inflate the ears first (ILDiver).
Step 1: Make sure there's little air in your mouth. Pinch nose, close throat. Exhale/push out any extra air that's in your nose.
Step 2: Now, open your mouth and jaw as wide as possible while still sealing your upper airway with your throat and your lips. You should feel a negative pressure building in your e-tubes and hopefully a crackling sound, too. If that doesn't work, pack some of the air from your mouth/sinuses down into your lungs (only 1-2 packs). After a pack (or the opening of your mouth = mouthfill) you will have air in your mouth and e-tubes at a lower pressure (eardrums bending inward).
Step 3: Now let the air back into the e-tubes by starting to yawn/or wilfully crackling/or roaring sound in your ears.
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- I can always get a crackle in the ears swallowing (dry land, eg. now) is this 100% normal? good?
On the quest!
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Yes!
