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jon b

Holding Overshoot

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Fernando,The real one always overshoots the magenta line on entering the hold, and also will go past the line on any further holds by a far amount.I wouldn`t worry too much as its inacuracy in the hold although I`m sure not intentional? makes it more realisticregardsJon

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Guest fcrash

But is this normal? It happens to everyone?[]s Fernando

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I have found it to be normal. The magental lines on the display are for reference only, they are not actual ground tracks. In fact, the perfect oval rarely occurs due to winds. The ground track with cross winds will have an outbound leg at a significant angle to the parallel of the inbound leg to compensate for the wind effects in the turn. They end up looking more like keyholes than ovals.


Dan Downs KCRP

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>But is this normal? It happens to everyone?>>[]s Fernando Since he flys the real bird (747-400) I would say his answer should settle the question don't you agree?...............Randy J. Smith................A PROUD MEMBER OF THE PMDG BETA TEAM[h4]Evolution is a process that results in heritable changes in a population spread over many generations[/h4]


Randy J Smith

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>>But is this normal? It happens to everyone?>>>>[]s Fernando>> Since he flys the real bird (747-400) I would say his answer>should settle the question don't you agree?>>>>...............Randy J. Smith................>A PROUD MEMBER OF THE PMDG BETA TEAM>[h4]Evolution is a process that results in heritable>changes in a population spread over many generations[/h4]Randy i think he was referring to other users and do they overshoot holds too. i confess to never flown a hold in the 744 yet so i dunno. id imagine if your speed was slower you'd be more accurate in the turns


Paul McMahon

Ireland

747400.jpg

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Guest fcrash

Paul , same thing , i've try a hold with 180kts and its the same.[]s Fernando

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really? hmm ok well maybe as jon stated its programmed that way because it behaves like the real 747. After all its not a 737 its a big bird :) i wouldnt imagine its a massive problem even if you fly on VATSIM they will make allowances for heavy jet performance (i hope :) )


Paul McMahon

Ireland

747400.jpg

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Guest fcrash

Paul , as you can see on the pictures one of the turns on the hold is perfect , and the other turn he overshoots. That way I believe that is a problem with the software , maybe a bug.I've done the same Holding with a LDS 767 and it is perfect[]s Fernando

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have you tried changing the Leg Time? also with a tailwind you might have a longer turn than the other one with the headwind


Paul McMahon

Ireland

747400.jpg

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Paul,Yes I think you are right about the winds,I`ll have to look up how the FMC adjusts for drift,as I can`t remember off the top of my head.Again I`m not sure if its be programmed to behave this way but knowing the programmers its probably an exact replica of how the real FMC makes corrections.Or it may just be an acident,either way its fairly typical behavior of the real machine in the holdregardsJon

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All the info I can find says you should stay on the pink track if you are in LNAV and at the hold best speed,provided the wind component doesn`t require more than 30 degrees of bank to stay on the pink.We seldom hold at the FMC generated speed in real life which i guess would explain why its not uncommon to see the plane going outside the hold.regardsJon

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Guest fcrash

Jon , does this kind of things hapened with you?[]s Fernando

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Funny how these birds can follow a LOC or GS signal with hardly any perceptible deviation, but can't keep on a racetrack.Paul

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>Funny how these birds can follow a LOC or GS signal with hardly any >perceptible deviation, but can't keep on a racetrack.I guess they put the precision where it's needed! ;-)Cheers,


Mats Johansson
PMDG Flight Test Dept
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| Asus Z270-A | Intel i5-7600K @ 4.8 GHz OC/H2O | nVidia Geforce GTX 1070 8GB OC/O2|

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>Funny how these birds can follow a LOC or GS signal with>hardly any perceptible deviation, but can't keep on a>racetrack.The latter is just an FMC generated track though.I remember when I was a lad I could fly a hold just using a VOR needle! Doubt I could do that now, I`ll fire up the sim and have a go!Jon

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