Julian Scarfe wrote:

The data there indicates an L/D of 51 at higher weights, 49 at lower
(about 50%).

"Stefan" wrote in message
...

But given that the original poster was most probably talking of airplanes
with noisemakers, I suspect that for him, best glide gets dramatically
worse at higher speeds.

What leads you to that conclusion? I don't think there's any basis for it.
Just because the L/D for airplanes is much less doesn't mean that the
variation of L/D with speed is different.

Julian