Fullwings
See Post #115 from Misd-agin:
Best Glide Speed
Can anybody comment as to the best lift/drag speed (best glide speed), with Flaps 30 on a B.777?
The AAIB stated that the speed decayed to 108 Kts.
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I asked this question to a flight test engineer. He stated for line pilots we could consider approach speed (Vref +5) to be close enough to L/D speed.
Holding speed on my a/c is 1.4 Vsi. Approach speed at Vref + 10 is approx. 1.4 Vsi(typical landing weight). Vref is 1.3 Vso.
Based on his comments, and the relationship of holding speed to Vsi, I'd think L/D is very close to Vref + 5.
We all know that L/D is not at, or even near, 1.0 Vso or 1.0 Vsi.