Jim Beckman wrote:
Given that most gliders are flown by pilots wearing parachutes, seems to
me what we have to consider is what fraction of accidents are made
survivable by a BRS that would not be survivable with an individual
parachute. Inability to get out of the aircraft is the only circumstance
that comes to my mind.

I know of several accidents where pilots didnt't get out of the glider,
and I even knew some of those personally. A BRS may or may not have
saved their lives.

The main problem is that is is very difficult if not impossible to
retrofit a BRS to most existing gliders. And new glider types are mostly
built around existing fuselages, whle a BRS would require a complete
redesign of the fuselage.