Hmmm...in my case a mounted ELT would have, at best, a 5% chance
of activating in the best case.

This is because I have flown 20 gliders without ELTs in the
past 2 years. A single mounted ELT in one of them would have
done little for me except ground the aircraft while it
was installed.

On the other hand, my personal ELT has been with me on every single
glider flight out of the pattern. And I've activated it four times.

Eric Greenwell wrote:

My imprecise recollection is pilots that parachute out are generally
found a lot quicker than pilots that crash, probably because they
survive and use the radio, cell phone, etc. For this reason, I decided a
mounted ELT would do me, my wife, and search personnel more good than a
personal one.
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Mark J. Boyd