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Touchdown attitude Incorrect

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Wind does'nt usually effect the touch down attitude. We add(my ops) half the steady state above 10kts and all of the gust up to a max of 20kts. So even at the max additive( REF+20), you still plan to cross the threshold at the unadjusted Ref speed. In the jets that I've flown, you dont carry that speed past the threshold. I have seen situations in heavy cross winds in which the pilot flying struggled with crosswind controls and didnt apply enough pitch in the flare. Usually see this with new guys in crosswinds. They either neglect to flare enough or they give up on the crosswind controls(aileron) after touch down.

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Yeah, we add half the headwind and all the gusts not to exceed Vref+20. On the flare the headwind component is normally bled off and the gust correction is held till touchdown. But even if not taking any wind into account, that is touchdown at Vref, the attitude does seem way too low on the PMDG738. Really hard to use your peripherals for landing while using a computer compared to the real aircraft so thought at least the correct pitch attitude on the PFD would have helped abit.

I gather I cant tweak any files to improve what is shown on the PFD then.
Very easily! The entry is in the aircraft cfg file. I've adjusted many aircraft this way. lift_scalar = Increase this figure to increase lift and lower nose. Decrease this figure to reduce lift and raise nose. Adjust the entry in the flaps.0 section to influence all flaps. Enter into flaps.1, flaps.2 etc, to influence the higher flap settings only. Adjusting the higher flap settings only would be preferable, so as not to influence lift from take off flap settings. However... I would say perhaps wait until PMDG have patched the product. You may find they are perfectly willing to fine tune if it is in error. Martin Wilby
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Thanks Martin. Will give it a go and see what happens. Appreciate your help.

I performed some stall test and found that at different weights on average the jet performs on approach as if 10kts hot. So take your ref +5 and subtract 10 and you will get the pitch and touch down attitides that are in the training manual. As for the SFP model, you may have to fly a little slower.

The landing flare profile found in my copy of the Boeing 737 NG FCTM dated Oct. 31, 2002 states the following: "airplane body attitudes are based upon typical landing weights, flaps 30, VREF 30 + 5 (approach) and VREF 30 + 0 (landing), and should be reduced by 1 deg. for each 5 knots above this speed." A diagram illustrates that at h=50ft (threshold) it shows 2 deg. - 4 deg., and 4 deg. - 7 deg. at (Touchdown). I'm curious as I haven't seen any comments from PMDG concerning this issue!!! I apologise if this is not the case.Whew.gif Regards,jen noulet

The landing flare profile found in my copy of the Boeing 737 NG FCTM dated Oct. 31, 2002 states the following: "airplane body attitudes are based upon typical landing weights, flaps 30, VREF 30 + 5 (approach) and VREF 30 + 0 (landing), and should be reduced by 1 deg. for each 5 knots above this speed." A diagram illustrates that at h=50ft (threshold) it shows 2 deg. - 4 deg., and 4 deg. - 7 deg. at (Touchdown). I'm curious as I haven't seen any comments from PMDG concerning this issue!!! I apologise if this is not the case.Whew.gif Regards,jen noulet
The 800/900 are different and require a different landing and takeoff procedure.. 7 degrees at touchdown in the 800/900 you're asking for trouble..
I performed some stall test and found that at different weights on average the jet performs on approach as if 10kts hot. So take your ref +5 and subtract 10 and you will get the pitch and touch down attitides that are in the training manual. As for the SFP model, you may have to fly a little slower.
This is very interesting! Would love to here from PMDG about this. It shouldn't be too hard to "fix" this?

Daniel Verhaal

The landing flare profile found in my copy of the Boeing 737 NG FCTM dated Oct. 31, 2002 states the following: "airplane body attitudes are based upon typical landing weights, flaps 30, VREF 30 + 5 (approach) and VREF 30 + 0 (landing), and should be reduced by 1 deg. for each 5 knots above this speed." A diagram illustrates that at h=50ft (threshold) it shows 2 deg. - 4 deg., and 4 deg. - 7 deg. at (Touchdown). I'm curious as I haven't seen any comments from PMDG concerning this issue!!! I apologise if this is not the case.Whew.gif Regards,jen noulet
That's also written in the manuals that come with the NGX. If you read further it gives the pitch specific for the 800/900 and even the SPF model.Tony F, did you have a look at section 6 "landing geometry" charts and touch down attitude charts at VREF for the 800/900? What are your thoughts on those boeing charts?
Considering Dr Vaos' answer, they seem to consider there's nothing to fix at all...Worried.gifhttp://forum.avsim.n...ost__p__2077307
Well, as G550flyer pointed out, Dr Voas' overlooked the fact that he was looking at the wrong charts, namely the unreliable airspeed chart which includes a safety margin resulting in a lower pitch. I hope he read that comment of G550flyer. The actual attitude should be between 2.4 and 3.6 degrees which means the NGX is at least 2.4 degrees off. Don't want to offend anybody, it is just a little issue. But wouldn't it be nice if PMDG admits this and at least give us some information if this will be adjusted or not for the upcoming sp1? Anyway, the NGX is a marvellous peace of engineering and I'll enjoy it everyday. The fact we are talking about these "details" says enough. Kind regards,

Daniel Verhaal

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I have the lastest issue: FCTM Revision 10 dated July 29, 2011 but doubt this should make any difference. I do fly the real aircraft, the -700/-800. the attitude we land at is approx. 4 degrees like i stated a few times. Anyone with the FS9 737NG or even Ifly 737x? Those attitudes seems a bit more realistic. Too much lift on the NGX. Just does not land like the real aircraft. Seems like even the ILS attitude (3 degree glidepath) shown on the PFD is lower than in real. Maybe compensating for excess lift????

I am sure if it can be fixed,PMDG will fix it.

Jim Driscoll, MSI Raider GE76 12UHS-607 17.3" Gaming Laptop Computer - Blue Intel Core i9 12th Gen 12900HK 1.8GHz Processor; NVIDIA GeForce RTX 3080 Ti 16GB GDDR6; 64GB DDR5-4800 RAM; Dual M2 2TB Solid State Drives.Driving a Sony KD-50X75, and KDL-48R470B @ 4k 3724x2094,MSFS 2020, 30 FPS on Ultra Settings.

Jorg/Asobo: “Weather is a core part of our simulator, and we will strive to make it as accurate as possible.”Also Jorg/Asobo: “We are going to limit the weather API to rain intensity only.”


 

I think we should consider NGX is the first model using "flight idle" thrust in the game.Thus.. it could be FSX limitation.. It would be easily 5 degrees if there is only ground idle like other aircrafts in FS.

Peter Chang

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