cmbaviator

Thank you for your inputs.

I may  have over pitched up as i thought i may need to hold more back pressure to counteract the pitch down moment (main subject of this topic)  normally induced during ground effect

10 minutes ago, Woozie said:

you're welcome. I just noticed that you didnt mention the specific 747 model. The code i posted is for the 747-8. Let me know if its about the 747-400 and i'll post my config for this variant too

it's indeed the 747-8

4 minutes ago, Woozie said:

Your L2 door is likely set to "standard door checks" which wont work with a complex addon plane. Here's my GSX.cfg file for the 747-8, you can either copy the entire code and overwrite your existing file or simply snip the [exit2] part only.  

  Hide contents

[aircraft]
nosegear = 25.88
refueling = 0
battery = 0
iscargo = 0
trafficcones = 0
preferredexit =  1
wingrootpos = 4.67 -0.51 0.68
wingtippos = 29.58 -17.02 1.80
fuelpos = 27.15 -14.53 1.19
waterpos = 1.33 -26.01 -0.14
lavatorypos = -1.30 -26.01 -0.16
engine1pos = -21.13 -5.04 -0.81
engine2pos = -12.10 3.26 -1.47
engine3pos = 12.10 3.26 -1.47
engine4pos = 21.13 -5.04 -0.81

[exit1]
pos = -2.88 24.29 0.91 6.00
code = (L:7X7XCabinDoor1L,number) 90 >=
name = L Entry 1
embeddedStair = 0

[exit2]
pos = -3.19 10.87 1.02 0.00
code = (L:7X7XCabinDoor2L,number) 90 >=
name = L Entry 2
embeddedStair = 0

[exit3]
remove = 1

[exit4]
pos = -2.37 -27.04 0.95 -12.20
code = (L:7X7XCabinDoor5L,number)
name = L Entry 4
embeddedStair = 0

[service1]
pos = 2.87 24.28 0.92 -6.20
code = (L:7X7XCabinDoor1R,number) 90 >=
name = R Entry 1
embeddedStair = 0

[service2]
pos = 3.13 10.88 0.96 0.00
code = (L:7X7XCabinDoor2R,number) 90 >=
name = R Entry 2
embeddedStair = 0

[cargo1]
pos = 2.00 20.51 -1.21 0.00
code = (L:7X7XforwardcargoDoor,number) 990 >=
name = FWD Cargo
embeddedStair = 0
uldcode = AKC,AKE,ALP

[cargo2]
pos = 2.10 -16.94 -1.02 1.70
code = (L:7X7XaftcargoDoor,number) 990 >=
name = AFT Cargo
embeddedStair = 0
uldcode = AKC,AKE,ALP

[cargomain]
pos = 1.95 -20.66 -0.80 13.20
code = (L:7X7XbulkcargoDoor, bool)
name = BULK Cargo
embeddedStair = 0
uldcode = BELT
 

 

thank you sir

i'm not asserting, I'm just asking if it's normal or not to not feel the nose down effect in 747 heavy during flare, it's a question and i'm just expecting developpers or real pilot to confirm it or not.

1 minute ago, srce said:

Have you run a GSX update recently? I was having that problem before, but support for the -8 should now be included in GSX http://www.fsdreamteam.com/forum/index.php?topic=19003.0

 

 

I guess i need to update manually, doesn't seem to work through P3D

I mostly fly A320 or B737-300 on Xplane, you usually retard at 20-30 feets, i was wondering if its the same for the 747 or you should retard between 30-40 fts ?

innapropriate ?

This topic is about the negative torque induced by ground effect and if the 747 should be affected or not because currently it doesn't feel at all

It gets better: All of these effects are reversed when landing. In other words, when we least want a reduced indicated airspeed, a nose-down moment, or a decrease in drag and thrust, that’s what we get. It’s no wonder primary students can have trouble with their landings.

source : http://www.aviationsafetymagazine.com/issues/35_10/features/Using-Ground-Effect_11069-1.html

Just now, scandinavian13 said:

Are you opening the doors via the DOORS interface of the FMC?

If so, and you are still receiving an error, please advise the creators of the program that's actually giving you trouble: GSX.

Yes via FMC, thanks for the reply

Hi guys,

When I want to board or deboard PAX, I always get a warning from GSX: OPEN door 2 even if all the doors are opened, any idea ?

thanks

Hi Guys,

I haven't been flying the 747v3 for months and restart flying since the -800. I messed up my flare as i Floated way too much even though it was within the LZ. But I notice that even when I released the yoke, the pitch was decreasing very very slowly. 

As far as i understand ground effet, it has mainly two effects :

1) as you approach closer to the ground, the vertcial speed will increase due to more lift

2) as you approach closer to the ground, the aircraft is subject to a negative ( nose down) torque.

the 1) seems to be spot on but however I still reserved on 2), it seems that the decrease of pitch is due to the lost of speed after retarding the throttle.

I own the 737/777/747 and all have the same issue with 2) unless i'm completely wrong.

Before i was flying with the IXEG B737-300, and you can really feel the nose down effect after passing 60 feets, you needed to hold a bit more back pressureto maintain your ROD until flare.

Also do you need to retard earlier ? here is a video of my landing

4 minutes ago, FlatCapRob said:

as for me i have deleted all exisiting downloads and folders re downloaded many times and i just keep getting the same thing happen :-(

that's what i'm getting too i think, lmooks like the link hasn't be updated to all customer or something

well i'm redownloading right now and see if its the latest version

Just now, scandinavian13 said:

As I mentioned in my last message:

"That or you left your original installer in your downloads folder, and are mistaking it for the new one."

If you're installing something and it isn't the latest version, it isn't the installer that you just downloaded. I can guarantee that.

i dont understand, i've downladed the instazller a week ago, shouldn't it be the latest version ?

Just now, Olympic260 said:

When you downloaded the file? From the file timestamps it looks like the zip file was modified on 3rd of February.

downloaded a week ago

i've complety unistalled the B747, it doesn't appear in the PMDC OC

But the downladed exe from my PMDG account is not the lastest update

i have the same issue with the B747 QotS II. I have unistalled it completly and redownload from my pmdg account, but the one i've downloaded is not the last version, how can I download the latest version ?

thanks

Even using 1024 resolution textures I can perfectly read the instruments, but I set 1x zoom factor and adjust my position accordingly to see the panel and outside.

I saw some people on youtube flying with a zoom factor to wide open, so unrealistic I don't understand why.

With zoom at 1, ill can only see the pfd and ND and thats all on a 1440p monitor

Thanks for your inputs guys.

Now lets go a bit harder with some crosswind:)

Up to 20 lnots its okzy i managed to decrab correctly but struggling up to 20knts.

Should you be fully aligned with the runway before touch down or your are allowed to decrab a bit after touch down. I noticed that when decrabing, the pitch increases slightly

okay guys, i would like some B747 pilots to rate my landing and to give me advice on how to improve my flaring

i've done some base trainning with flaps 25 / 30 and 25 with crosswind.

For now i only have the flaps 25 :

For me i'm floating too much, i'd like some advice on how to obtain the same RoD but with less floating

12-17 fps at yssy fly tampa with 4790k@4.6GHz and gtx980ti, is that normal

Anyway its rare to see hard landing nowadays unles you have maybe like less than 50 hrs on type

The 747 is insanely easy to grease on. I flew the 737 for over 8500 hours and recently left the 320 after 3300 hours. The 737 (300 and 500) were fairly predictable. The 320, I could make a number of smooth landings then bam! The 747 landing pretty mechanically, I listen to the radio altimeter call outs. At 50' start pulling the power off, at 30' start flaring, but not a whole lot, at 10' feet, hold the site picture, which requires a tad bit of back pressure. What I noticed in the sim was you knew you touched down when you heard the spear brake moving back. It's has a loudish servo. I've done 8 landing so far in real life. It was just like the sim. 7 greasers and one so-so. The so-so was my fault. I landed flaps 30 instead of the normal 25, it was windy and the runway was SFO 19L. All a bit non standard. I fixated on the aiming spot and didn't change my focus down the runway in the flare.

What I'm trying to say is this simulation is pretty realistic. I think real life is a bit easier to grease it on.

I was landed with flaps 30, i thought it was the standard landing flaps lol.

Whats the target pitch to flare at with flaps 25 and 30 ?

Im just surprised on how small input you need to give in order to land

https://youtu.be/50rIwXiS3ck

Much harder landing : https://youtu.be/iBXwXLwGd9U

My pfpx uses as16 for wind data, gonna give it a try this WE, i pnly go less than 4hrs flight. I think you can update the wind data in flight

The 747 is NOT a 737.   The huge wing surface means that the aircraft handles vastly differently to the 737 when entering ground effect.   There is a huge cushion of air as it settles onto it-  you cannot compare ground effect of the much smaller 737 wing to that of the 747, that is comparing apples to oranges.

 

Have a look at the voluminous amount of vids on the internet about 747's landing - they all hover in ground effect for quite a bit of time before settling down.   Only in rather nasty whether, bad turbulence or some windshear will you notice a bit of a bump, or unless the pilot really gets it wrong.   I have read many posts about pilots commenting on this very aspect.

 

Regards

I know that a b737 is different compared to a b747 but the ground wffect physic is the same gor any aircraft. Therefore we should feel a pitching down moment on the b747. The video i posted is to only show that the ixeg had the negative putching moment and not te B747 ( maybe ?)

You realize this is a users forum?  For direct contact with PMDG please visit the PMDG Product Support portal at their web site.

Ah okay, thanks for the info

You're comparing to very different airplanes. you're also comparing tow very different simulators.

Saying one plane is easier to land than another and then saying it's modelled wrong doesn't make much sense.

The CRJ 200 is much much easier to land than the CRJ 900. They are two different airplanes just like the 747 and 737 which means they will have different techniques.

I only used the comparaison to show the negative torque of the ground effect which is obviously modeled in the IXEG, I'm updating another video of a greaser with the b747, i only had to make very small input to flare, i almost feel like I had to push forward the yoke to avoid floating too much.

Anyway I'm just waiting for dev's answer