Glide Chart
 

By any chance does the POH cite a glide chart for both engines out?

Like this
see photo attached

13.2 ratio? Really?

Thanks, btw.

Not to belabor the point, but is 13.2 really even roughly correct? This would well exceed the same data for an M20F, and approach mid-to-late century gliders. Given the recent tail of a near double engine failure, this would be good information to have. I understand of course that weight and exterior contour changes can play a large role in the final outcome.

part of the reason twins have a relatively good glide ratio is that the charts assume both props are feathered, which reduces drag considerably.

But the M20s also feather, and they only advertise something around 11ish. Add to this, fwiw, that the Mooneys earn their living by being just a little more slippery than other aircraft in their class.

Could it be that the small twin booms are that much less drag than a full empennage?

Mooney
 

Mooney's are advertised as a little more slippery, but they also have much higher wing loadings, hence lower glide ratios

FWIW
Here is the Pressurized H model glide distance

(2) engine out glide ratio
 

Hi All,

Here is the chart from my 1977 337 G.

Guy Paris.... the old 72 driver....