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Difficulty slowing down on approach

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Mats Johansson
PMDG Flight Test Dept
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Guys, The -800 model is a slippery one compared to the others due to its perfect aerodynamic balance (law of aerodynamics). When I first started flying the -800 during development, it was a slippery one alright and kept saying to myself, the FDE is a work in progress. But as time went on, still the same slippery deal, I asked our tech advisors (real-world NG drivers) about the slippery aerodynamics if it was normal. Every single one of them said YES! Since then I have learnt to think ahead of the aircraft and begin slowing her down much earlier :-) The FDE is not wrong, it is how the real -800 feels! Try the -900, you'll notice a difference. Cheers,

Jason Brown - Exterior Model Engineer,

http://www.precisionmanuals.com
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Try using alittle bit of drag on decent my friend it works for me

Try using alittle bit of drag on decent my friend it works for me
and i don't mean dressing in womens clothes Whew.gif

My most recent flight on SWA ( I know it was a 737 not a 738) the pilot was a big fan of speed brakes. Crossing over Cape Canaveral to crossing over Orlando headed to TPA he used them quite often. Made for a interesting ride. I imagine that is how he managed the speed in advance of approach.

Cheers!

Richie Walsh

Well ... I do not know. I think we do have a problem here. It's not a matter of being idle 35 ~ 40% or whatever it is. Physically I put my whole throttle back and in the NGX I see all the levers go back but after ~ 1 second the levers move a little and never stay at idle until I touch the ground. It's not about numbers at idle, I know they vary due to many factors, but rather on the levers do not turn at idle ... even if I press F1 ... have to keep pressing the F1 and not drop so that it is idle. Even with the A/T ON in an approach that would require the A/T lead to idle they are not ... are always a little higher. I see it in the levers, not the numbers. I think you should really look at this ... By my 7 years of experience with MFS is the first time see it and not seems to be lack of user knowledge Thank you.

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SAITEK PRO-FLIGHT YOKE - GS THROTTLE SE

 

Eric Canto

Again, due to FSX limitations, that's how Approach Idle is simulated. Your hardware (or F1 key) commands Ground Idle, and the NGX subsequently intercepts the throttle command and places it at the correct Approach Idle position. You observe it on the instruments as an uncommanded increase in N1, as well as the thrust levers being slightly forward of the mechanical idle stop. It's normal behavior. Edited to add: That's why once you're on the ground, the throttle returns to your perceived "normal", because once you're on the ground the EEC commands Ground Idle.

Well ... I do not know. I think we do have a problem here. It's not a matter of being idle 35 ~ 40% or whatever it is. Physically I put my whole throttle back and in the NGX I see all the levers go back but after ~ 1 second the levers move a little and never stay at idle until I touch the ground. It's not about numbers at idle, I know they vary due to many factors, but rather on the levers do not turn at idle ... even if I press F1 ... have to keep pressing the F1 and not drop so that it is idle. Even with the A/T ON in an approach that would require the A/T lead to idle they are not ... are always a little higher. I see it in the levers, not the numbers.I think you should really look at this ... By my 7 years of experience with MFS is the first time see it and not seems to be lack of user knowledge Thank you.
The NGX simulates things we have never seen before, you are describing normal EEC behavior.

Shane Gavin

Okay. Better because then there is no problem to fix. So what we have to plan is even better an approach.Thank you.

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| I7 2600K @ 4.7 | GTX 550 TI | Corsair 8GB 1600 | ASUS P8P67 | Cooler Master V10 | Corsair TX650 | Thermaltake V4 |

SAITEK PRO-FLIGHT YOKE - GS THROTTLE SE

 

Eric Canto

Just to add: Real world, you have to move the TLs up a ways before you'll see an actual change in N1. There's maybe an inch or two of travel before you'll see a change from the current idle N1 (N2, really). So, there's really a dead band at the bottom of the travel. If your N1s are different with a Throttle attached vs not attached (see Clum's post) then maybe it's a hardware issue.

Matt Cee

Okay. Better because then there is no problem to fix. So what we have to plan is even better an approach. Thank you.
Yep, the realism of this aircraft is going to expose many bad habits and technique of sim pilots, but it's not our fault that past products are not as realistic as the NGX.

Shane Gavin

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