This happened two years ago up at Bong Rec in Wisconsin with my 4" PML Endeavor on a soda-can Aerotech 54mm (I215R IIRC). The cause was a faulty ejection charge. IIRC some grease had gotten on the delay when I was assembling the engine. In short, she planted about a foot in the ground, and additionally the nose managed to...well...the pictures speak for themselves.:y:
It rattles when you shake it, and that's not from dirt inside the cone, that's dirt trapped in all the folds!
At least the fin can + about 5" of tube survived, so she'll be flying again!!
Lesson learned - Watch the grease, or just stick with electric deploy.:eyeroll: