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Deep Stall - flyvning under våde forhold

 

Deep Stall

To friske rapporter fra vores nye, fælles internationale hændelsesdatabase. Disse to omhandlende styrt p.gr.a. flyvning i regnvejr:

1. During a thermal flight at Brauneck site, the pilot flew through a rain-shower. He tried to escape with big ears and accelerated flight. Over the valley, he returned into normal flight, but a few seconds later, about 150 m GND, the glider suddenly went into a deep stall which was not to recover. Crash into trees and through the trees to the ground. Only minor injuries. The pilot said, he was not informed about the deep stall problem, caused by a wet glider.

2. Kössen-Testival. The pilot performed a flight with a brandnew LTF/EN B (of a po- pular brand). During the flight, he came into a rain shower. The paraglider went into a deepstall. Despite different tries to get out (acceleration, pushing the a-risers), the paraglider remained in the stable deep stall and was not steerable. Landing in a fo- rest on a tree. He was rescued with mountain rescue service. Uninjured.

Bemærk at paraglideren uden varsel - og ganske uprovokeret fra pilotens side - pludseligt går i deep stall, som der på trods af korrekt udretningsteknik ikke kan ret- tes ud af !

Regnen øger vægten og påvirker linelængder og materialeegenskaber - resultatet er ændrede og uforudsigelige flyveegenskaber.

NB: Du kan også komme i samme situation ved skræntflyvning i tåge...! 

 

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