How often did wing-folding mechanisms fail in flight?

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The original design of the F8F had the wingtips blow off in the event the wing was being overstressed, but I don't think it was anywhere near the wing fold joint.

I remember reading that it was near the fold, and also was not always wing-symmetrical, so the "feature" was dumped.

Here...
F8F with wingtip broken off:



F8F with red line showing explosive separation point:



F8F Safety Tip Illustration:

 
I mentioned flying the F-11A briefly with VT-26 at NAAS Beeville in Advanced Training. A delight to fly, but just barely supersonic with the puny J65, and very short legged. It had several unique features.
Per this thread, the very tips folded ... DOWN ... and were actuated manually! A flight line sailor would lift tips into position and wiggle until the locking pin seated. Also, it had full span flaps and slats, with very effective roll control via large wing spoilers. To eke out every bit of range, the Tiger had a wet fin, which was emptied first to avoid aft CG. The "long nose" version was added to accommodate a larger AN/APQ-50 all-weather radar, also used on early Phantom II aircraft, but no change in designation.
Finally, due to contract finagles and inter-service changes, the SAME design was designated four different times, as: F9F-8, F9F-9, F11F-1 and then F-11A.


Also, here's a pix of an F-4 flying with wings folded. With 2 J79s, wings are redundant!


To complete the wing fold fiascos, here's one of the F-8 incidents.
 
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The Brits led the field with Crowded Carriers and Complex Counteractions.

Seafire solution (I'm pretty sure, all manually activated)


The Kluge Champion would seem to be the Fairey Gannett which seems to never have seen a makeshift mod that it didn't like!
 

And some folks think origami is Japanese art.
 

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