I would really be interested to find out what the rate of descend might be in a total engine flameout situation. During my original training with Boeing on the 73-4, we used to practise dual engine flameouts in the SIM,(it was shortly after this had happened to TACA, when they put one in a Rice field in Louisiana) Unfortunately, I never had enough time to look at the rate of descend during those sessions, as we were rather occupied with the drill of relighting before meeting terra firma, which needless to say, always worked out.
Anybody have the answer to this?