greenketch:
(5) There are numerous test that confirm triaxial loading. Let alone the math of force mutliplication. Look at the certified rating stamped on your biner. these are established by both manufacture and third party tests. On axis is very differant from off axis which is diferant from open gate. How would you propose loading in more than one direction and not varying from the one known strong orientation?

swede:
Triaxial loading: Not good at all. People not used to mechanic calculations does not really understand how bad this can be. You will find threads dealing with the american death triangle with nice drawings. Please remember that most carabiners are built to take the load along the side with no gate.

trenchdigger:
It really depends on the orientation. On top of that if you try to stack too many carabiners in another single carabienr, you could conceivably end up with funky loading, but I wouldn't worry too much about this.

rocknice2:
Yes if the two biners have loads pulling in different directions.
If pull is in the same direction it's lessened but still there, especially if top biner is asymmetrical [d-shaped]. This is because one biner is not up against the spine.
Ovals handle this example much better.