HI,

I have an issue as perhaps many others have when I fly the pmdg 737 ngx

 

on final I disengage autopilot at 1000 fly manually then disengage A/T at 50ft throttle is at idle

 

but when I pull back on my Saitek throttle for reverse thrust too kick in there is a delay by the time reverse thrust kicks in I am already at 60knots with autobrake. is this a normal procedure as with the real 737-800??

 

any advise is greatly appreciated

 

thank you

 

Mike

No, not a normal procedure in the real ship. There's a slight delay between "activation" of the reverse thrust system during which the reverse thrust levers stay on an "interlock" position. Once the reverse thrust is "ready" for use, the levers can be used as required to modulate the amount of reverse thrust.

 

On the simulator, I recommend not leaving the A/T on during the approach. The reason is your hardware throttle is not working like the "real" throttles of the real airplane do. In real life the pilot can always override the A/T, pushing or pulling on the thrust levers. In the sim that's not the case.

I have exactly the same issue, regardless of how I perform the approach, which incidentally pretty much how you describe Mike. I think I'm correct in saying this is an NGX bug (May be wrong) and has been reported many times before on the forum.

Hmm thanks for the reply guys, it may or may not be a bug as I have just watched some youtube videos and some of the landings I have seen engage as soon as they land. I don't get it.

 

if it is an pmdg 737 ngx  bug they need to address this asap as we are paying customers.

 

NOT HAPPY!!

 

Mike

Hello Guys,

while I was using for reverse F2 or FSUIPC command Throttle dec slowly, it worked fine,minimum delay. But since I have axes assigned to FSUIPC reverser axes for reverse, I experience the same behavior, with 777 I only experience delay of reverse,until nose gear touches down,

 

 

Rado 

I use a button (the detent on my throttle) as my reverser switch. And have it set thru FSUIPC to "repeat" when held. My reversers come on at touch down (full mind you, not 100% realistic) and act normally.

Hmm thanks for the reply guys, it may or may not be a bug as I have just watched some youtube videos and some of the landings I have seen engage as soon as they land. I don't get it.

 

if it is an pmdg 737 ngx  bug they need to address this asap as we are paying customers.

 

NOT HAPPY!!

 

Mike

 

It should work fine, what assignment are you using for reverse thrust and are you setting it through FSUIPC or FSX? Do you have a hardware throttle? What are your throttle override settings set to in the PMDG options?

Just retard the throttles to idle before touchdown & activate the reversers just before touchdown, that way you can have reverse thrust sooner.

Hmm, some interesting replies. I have my reverse thrust on my throttle lever of my Warthog, assigned via FSUIPC. I think I will revisit this and take another look.

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Hi James

 

I have my Saitek throttles  set in fsx settings, seem to be working fine with other aircraft pmdg 777 level d 767.

 

 For instance sitting on runway at idle and I pull back on throttle quadrant the reverse thrusters work just fine.

 

It is only when I land, the rear landing gear touches spoilers deploy engine are idle I pull back and nothing,  front landing gear hits the ground aircraft rolls out with auto brake 2 slowing aircraft down. few seconds later is when reverse thrust works.

 

Mike

Hi guys,

 

Over the time the community got to the result by collective experimentatiton - the thrust reverse delay is due to FSUIPC manipulating the throttle axis, when you use FSUIPC calibration. My personal theory is, that this "shuts down" (circumvents or somehow makes ineffective) the part of code that PMDG uses to manage throttle regime/idle mapping to throttle axis.

 

It can be circumvented by turning off FSUIPC calibration.

I use the Saitek throttles calibrated in fsuipc and reverse thrust works great. Here are the instructions I used to set them up.

 

"To set up the reverse thrust you will need to select the button+switch tab. Then select aircraft specific tick box, as you want to make this specific to the aircraft you are setting up. It will ask you to select the button you wish to program, to set reverse thrust for engine #1 pull the lever you set before as engine #1 throttle control into the red zone on the throttle quadrant, this selects the button in this zone. It will then show the button number that has been selected. On the right hand side of the window under the control to be sent when selected dialog, select "throttle 1 decrease" from the drop box. Under that you will see a control to be repeated while held tick box, select that box. Then under that in the control sent when button released drop down select "throttle 1 cut". That is it, repeat for engine #2 "

 

I got that from a guy on the New Zealand flightsim forums.

Just retard the throttles to idle before touchdown & activate the reversers just before touchdown, that way you can have reverse thrust sooner.

 

Just a minor point: you might be able to do that in our sim (apply just before touchdown) to get it work more realistically, but on the real aircraft the reverser's are usually tied into the main gear air/ground sensor switch...which means, the reverser's won't actually work until the plane gets an on-ground signal....this sensing usually comes from the main gear so even in the real plane, you can get the mains on and start the reverser doors sliding aft while the nose wheel is still off the ground.

 

For anyone interested in how the cockpit reverser handles work in a real jetliner:

 

Pull up on the reverser handles until it stops at the detent. This is about 2-3 inches of upward movement.

 

The detent is a physical mechanical lock...the purpose is to force a very short wait state (1 or 2 secs approx) to give the reversers time to move into their reverse idle thrust position.

 

On the 737NGX, to get into the reverse thrust configuration, those large internal 'blocker doors' that slide into position inside the fan section (you cannot see them from the outside) to block all of the fan air from exiting backwards as normal.

 

This forces that fan air to escape through the case sides through the 'cascade vanes' (these you can see) which are now exposed when the outer cowling slides aft to expose these fixed cascade vanes.

 

The vanes are fixed and angled approx 45 degrees forward and the fan air gets blown through them and thus forward at a 45 degree angle to create the 'reverse thrust' effect.

 

Once you wait out this short mechanical delay, the detent physically unlocks the reverser handles and you can now pull up and aft and control how much reverse thrust you want to apply.

 

The reason I keep mentioning this short 1 to 2 sec mechanical time delay is because I've seen many new pilots, upon landing, forget about this delay and they try to pull the reverser handles up (really hard) and aft in one movement...but the mechanical lock is made out of metal and it's built like a tank...you ain't going to make it work any faster by trying to pull up on it as hard as you can...I've seen guys pull their hands off the handles they were pulling up so hard and many in training forget about this short detent lock under their landing stress.

 

So the proper technique is pull up a few inches, wait for a sec or 2, and then continue pulling up and aft.

 

When we watch a plane land, we can watch those outside cowling doors slide aft...that is the reason for the delay that is taking place...once they have reached the full open position (have slid full aft), the pilot can NOW apply full reverse thrust as needed.

 

I'm sure the air speed policies differ from carrier to carrier but, generally speaking, you want to be out of high reverse thrust by 70 knots and have them stowed by 50 knots. If you're holding any descent reverse thrust below 50 knots then you run the risk of ingesting FOD into the engine inlets from the reverse thrust hitting the ground and throwing up small rocks, etc. So, 70 knots is a good speed to start coming out of reverse and once out, then stow the handles back down fully.

Thanks very much for the excellent explanation Ralph, appreciated.