Just a quick heads up on these hidden monsters. Took off immediately after the Spain match yesterday evening into a southerly 3mph wind direction (prevailing wind was east, with a northerly component above 1200ft asl). Bimbled around the fields about 800-1000ft agl in an approximate 7km radius circle, with only very slight occasional turbulence, but mostly smooth air. 30 minutes into the flight - Bang, left wing collapsed and a cravat. WTF. 10 seconds later after 4 pumps to get the cravat out, I was going up at 600ft/min, but concentrated on recovering the wing and maintaining direction. Where did that come from? Exited the thermal with a couple more minor collapses and back to all smooth again. looked round and thought nothing of it, but noticed that a motorway service station was near me (Lots of black tarmac and retained heat from a very sunny day). Variable wind directions gave me no clues otherwise. The cooling evening air must've had a significant effect on the thermal strength, but completely took me by surprise.
Caught out good and proper (that's despite 550 hours on paragliders with several thermic cross country flights in the UK and abroad).
I won't mention the wing name but its a certified ENB paramotor wing, it was in the certified trimmer setting and I had my hands on the controls at the time.
No issues for me in that situation, given my experience, but may serve as reminder for others with less air time during this wonderful spell of hot sunny weather.
Happy uneventful flying!
Richard