TO MEMO
Join Date: May 2007
Location: Europe
Posts: 50
Good one for the Sim.
both engine flameout and gliding to an airport
2 MN for each 1000 ft. And you`ll have to lower the gear around 2000ft.
Add 2500ft for an 180º turn (down wind to final). 1000ft for a 90º turn
Actually modern jets have glide ratios around 18:1, which equates to 3 n.m. per 1000' of altitude. 767, designed about 30 yrs ago, is 17.9:1.
TAS divided by sink rate/100 = glide ratio. Eg, 260 KTAS/1300 FPM = 20.0 (or the cheating way, 260/13 = 20)
Hmmm, have to figure out what the 757 winglet glides at.
Manuals provide the best gllide speed (L/D). Check out the "dual engine flameout" driftdown speeds. Typically (last 3 a/c I've flown) it's very close to Vref 30 + 95 kts.