Originally Posted by
Private jet
You really don't need to tell me what EPR is....... Yes, below 1.00 then the intake drag > gross thrust out the back but that is a factor of TAS/MN & i was talking about on final approach at relatively low speeds, that is after all the title of the thread "Landing". Yes, i'm sure there will be net drag with very high bypass ratio's, such as the LEAP engine on the NEO 10-11:1 BPR but i was flying the CF34 a more conservative 6.4:1. (and it was an N1 only engine, I'd much prefer EPR too.) I don't think the earlier fan engines (RB211 etc at 4-5:1) went below 1.00, not regularly anyway. Yes, I generalised too much with the jets. However a pure prop will always produce net drag at idle, i have vague recollections of the instructor setting "zero thrust" on the "failed" engine during training. I was glad to get away from MEP's after qualifying tbh, awful things!
And sure a bizjet will descend fast if you push it down and go at Mmo, but it's not a very efficient, elegant or comfortable way of doing things is it?
Apologies, was assuming lack of experience....
320CEO: 1.05 EPR: 250 clean, 210 F1, 180 F2, Vfas on the GS. 320 NEO GTF: it depends... EPR definitely better for hand flying.
Definitely remember zero thrust settings, have about 5k on MEP, great times when you are young and invincible!
And you are correct, I am pretty sure I never did a flight idle descent in a bizjet with pax, as they would for sure have had something to say.