Stellungnahme von Manuel Cabrere, Produktmanager für Atemregler zum TAUCHEN Test (Ausgabe Nov. 2020)
Why do they remove regulators from mouth?
No manufacturer, no training agency encourage such a procedure, it is even the opposite!
As it is a human test, the speed of the removing from mouth, the speed of the rotation of the second stage, the time spent on each position will change on each tests. This will affect the way the water will get inside the second stage and the way the temperature of mechanism will decrease.
Is the second stage really horizontal during test?
Is the time during the free flowing is exactly the same on all tests and for all models?
When removing the second stage from mouth, was it during inhalation or exhalation? Here it seems it is completely aleatory.
Elapse time between the remove from the mouth and the start of the free flow seems not to be consistent.
We all know that flow rates of second stages are different depending the brands. The flow rate will directly impact the amount of cold created during a free flowing test. With 20 seconds tests a second stage with 1500l/min compare to a 3000l/min will resist more as it creates less cold in the same period of time (comparing “carrots with potatoes”).
From what I can remember from the video we can see some other regulators, it means depending the running order, the tested regulators will not exactly have the same internal temperature. This is will have a major impact on the freezing resistance of regulators.
The complete test is what it is, but compare to a norm (EN standards) what they done seems totally random. Run the test a second time and you will have completely different results…
What they have done is not what will happen during a normal dive, I do not understand their motivation and what they want to highlight, except as already said to create a wahoo effect with emotions, affect and chills.
In particular the breathing work was really low - probably because of the venturi effect
A very low work of breath is not only because of the venturi effect.
As they test Elite model is more because of the of the accuracy of the adjustment knob. The adjustment knob will reduce the cracking effort where the venturi vane will change the aspect of the injection curve.
…this venturi effect may have caused the problems in the second stage during the cold water test
Question the venturi effect on the problem they had is for me not fair and illustrates a poor knowledge on freezing resistance.
What will help the closure of the shuttle valve on our mechanism? : The value of the spring.
What can change the load of the spring? : The adjustment knob will do the job not the venturi vane.
With a strong load on the spring you will generate a ice breaker effect. The force of the spring will allow the breakage of the crystal of ice. The venturi effect will change nothing on that phenomena of ice breakage.
Last but not least
You also have an article from UK : https://www.scubadivermag.com/world-exclusive-review-aqualung-leg3nd-regulator-series/
“….we put the three units through our usual rigorous testing procedures – breathing them in all positions, purging them extensively – and excessively – underwater and on the surface, and regardless of what we subjected them to, we could not get any of them to freeflow or be even-remotely troubled in single-digit conditions.”
Strange that 2 magazines (one in US and one in UK) recognize the freezing resistance of our regulators where only German find issue. It sounds the protocol they use does not reflect what manufacturer run as cold water tests.
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