Thanks for the lucid and objective report. The accident scenario you
describe is the stuff of nightmares! I am very glad this did not turn
out far worse.

I do know the ship fairly well and have assisted in rigging/derigging
it dozens of times. The wing attach mechanism is unusual compared to
most gliders but it has been successfully employed in this model of
aircraft for a couple of decades. It operated as-designed the day it
was rigged and derigged in Tehachapi immediately prior to this
incident. Your description suggests that the outboard wing attach pins
were not (fully?) engaged. Does this appear to be the case? Any
further speculation on my part is not relevant or helpful. I eagerly
await the definitive report!

My condolences to you on the loss of the aircraft and best wishes to
the pilot for a speedy recovery!

Best Regards, Mark