Today, 01:09 #
97 Wornout Rubber
Instead of being 'just another number' I could order a
Personal Title and be a bit different
Join Date: Jan 2008
Location: Dubai
Posts: 10
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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Anyone have simulator access that can answer the question?
The formula (found on internet...) is TAS x 100/sink rate (FPM) = glide ratio.
IE 250 KTAS x 100/1300' = 19.2
Try a couple of different speeds, and various flap settings (20 being the most interesting due to the reduction in LE slats), and you'll come up with the answer.
Modern airliners are around 18:1. Easy formula is altitude in thousands x 3 = glide distance for a clean aircraft at best L/D speed. Eg, 30,000' x 3 = 90 n.m.
QRH for my a/c has best L/D speeds(clean) listed under "Dual Engine Failure".