First of all , thanks all of you for your answers.
How do you know you are doing the real frenzel technique
Eric , I know I am doing Frenzel because :
1. I learned the Frenzel following the instructions of your document (You are Eric Fattah , right? By the way if you want a translation of your document in Greek I can sent you one)
2. I use the "Adams Apple" ("Bobbing Adams Apple" ) to move upwards the back of my tongue. I can ,almost stick the back of my tongue to my palate
3. I can't equalize using the valsalva technique
It is 100% sure that I am doing the Frenzel technique. You are right , it is possible to break your eardrums ( I couldn't believe this 2 months ago) on land if you are practicing a lot and hard, so I am practicing without pinch my nose , just to get the tongue movement. Periodicaly I am doing the technique by pinch the nose but gently. I always hear my ears opening (both of them instanly) when I am doing Frenzel by pinching my nose. I cal almost hear them open without the nose pinching. Sometimes I can open my ears in the sea doing the Frenzel without nose pinching , just using the against pressure of my mask.
Unfortunately It is not easy for me to practice at the sea in this time. I can't find a pool with dept bigger than 3 meters , so I have to practice on land. But "life under the sea is different than life on land". Anyway.
The real problem is the vertical (totaly vertical position). Things are much better in across position. But in vertical position , I feel like I loose the control of my neck muscles , which use to make the Frenzel. Like the muscles moving up to my head.
From other hand , Larry "Harris" Taylor (
http://www-personal.umich.edu/~lpt/ears.htm ) says :
"The inverted position is the most difficult position for equalizing pressure because it places the middle ear below the mouth ...thus the equalization process must work against the pressure gradient of the water column.
Also, the head down position places the inner ear semi-circular canals in the least favorable orientation for determining direction in the water column."
Well , I tried very hard to reach the Frenzel. I feel that must be something very simple that block me now. Maybe I just need more "water life".
Any comment , idea or advice is welcome.
Eric by the way , German Stuka bomber pilots were using the Frenzel hands free , didn't they?