Carabiners have proven themselves in alpine sports, but in the light of recent problems it appears debatable, whether they are the optimum solution for aviation sports. The shape and application of carabiners have indeed been adapted to the demands of aviation sports, however, due to the play of the fastening catch conventional paraglider carabiners are insufficiently dimensioned for the constant high oscillation loading, to which they are subject during flight.
The loading during normal flight mode is consistently within the range of the gate play, thus with regard to constant oscillation loading it is irrelevant, whether the catch is closed or open. Currently available steel and aluminium carabiners permanently mishappen by a loading of less than 300 kg.
By long term oscillation loading tests carried out by the DHV with aluminium carabiners 4 from 8 carabiners broke with an oscillation loading of 4 to 45 kg. In practise paraglider carabiners are permanently loaded between 30 and 60 kg. One of the tested carabiners already broke by 210.000 oscillations. An aluminium part in mechanical engineering is regarded as permanently oscillation secure, when its dimensions allow it, to withstand 2 million load changes.http://www.finsterwalder-charly.de/down ... 04_eng.pdf