This is interesting - but I would be surprised if the engine-out performance of a B737 is anything near that of a glider.
Having flown wooden gliders years ago - the most efficient being a Skylark 4 with a L/D ratio of 1:36 - and then having carried out a manual reversion in the sim with both a B737-300 and -700 I was amazed by the glide angle on the Boeing. I remember looking ahead for the airfield but was surprised to find it was out of sight under the nose!
The rule of thumb for the engine out performance in a B737 was clean speed (210kts in the -300) with a glide ratio of 1nm per 1000ft - so approximately 1:6. Nothing, I would suggest, anywhere near the performance of the most inefficient glider (the Air Cadet T31 did better than that!).
So where these figures for engine-out performance for the B737 being comparable with a glider come from I don't know?
FOK
