Originally Posted by HN
If you want a simple rule-of-thumb, then JT's 1/1000 is hard to beat!
- I have no reason to question JT's figures for that flap setting in a 727, but:
1) Add
at least 20% (probably more) drag to go to full flap (40) from 'approach flap' ((? 5? ?15? )
2) Reduce speed from that speed (probably either 170 or 150) to Vref+5 (?130?)
Go back to your whizz-wheel and tell me what gradient you get - purely out of interest.
I cannot see rate of descent on your graph anywhere which is what I thought we were discussing.