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http://hmga.gr/storehouse/word-acrobat/Ice%20Climbing%20Anchor%20Strength%20-%20MRA%202009%20-%20Marc%20Beverly.pdf

Mean failure was 11.3kn for traditional horizontal abalakov, vertical orientation was stronger with a mean of 14.4kn

I saw a "live" abalakov test at an Ice festival here in Norway. They measured the abalakov to be stronger (>1300kg) than the ice screws (1100-1300kg).
Of course I dont have any reference for this test, which screws used etc, but the test persons came from a shop www.VPG.no and the test seemed good to me.
This was in ~5 degrees below zero, in the sun, but good ice. Of course it all depends on the ice conditions, but the worse ice the more abalakovs you should make before rapelling (could be one abalakov in really hard ice, while you might use up to 4 abalakovs in soft ice if you have enough slings/bands.

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