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guenseli

"automatic" takeoff through trim?

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Hello, with the MD11 if you have calculated and set things up properly, the bird was taking off - depending on the runway length - itself due to correct trimmings. Won't that work with the 737 too?The NGX is running to the end of the runway and does not show any tendency to take off itself.... ?

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Hello, with the MD11 if you have calculated and set things up properly, the bird was taking off - depending on the runway length - itself due to correct trimmings. Won't that work with the 737 too?The NGX is running to the end of the runway and does not show any tendency to take off itself.... ?
Have you tried pulling back on the yoke tad? Say. Around Vr?

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Definitely not a RW technique. With the trim set per the correct CG, you still have to pull the nose into the air.

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Yes of course, when I pull the stick, she's taking off... But I wondered as the MD11 is taking off without pulling the stick....What is now the correct behave?

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I have never had a automatic takeoff with the MD 11. Until now I had always to pull the stick to me, or I keep rolling. Maybe a matter of CG?I also think it is difficult to compare a MD 11 and a Boeing 737.

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Quite simply, if the MD-11 is lifting off without you pulling up, then you've gone way past the Vr speed, you have trimmed way to much, or your center of gravity is totally messed up. You should always have to apply some force to rotate. The 737 has the same logic. There is something you have done completely wrong if you are able to lift off without touching the controls.

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I'm quite sure that I have everything well done with the MD11 except not pulling the stick at VR.Yes I got beyond VR... But as I stated above, I calculated CG and trim etc with TOPCAT and set it according to wind and runway.In every case, the plane was setup for taking off before the runway was ending.This was also above VR, yes, but I thought this was a kind of "feature".

Why bother even flying the plane. get a Drone!
I have not said, that I want a plane taking off and autoland fully automaticallyI just wondered about the different behave between MD11 and the 737. I really wonder why some guys have nothing else to do as state rude comments ... instead of trying to help or think about what was writen above. Or simply do not write anything whats coming into their mind ... Talking%20Ear%20Off.gif

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No.. Not a feature. You must certainly pull up on the yoke. If you don't have to, then something is wrong. TOPCAT or not, I would always check the variables against what the plane itself wants you to do. What ever happened to "Piloting" a plane?

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Is the Topcat calculated CG the same as the Loadmanager's CG? And is the Topcat callculated trim the same value as the FMC calculated trim?

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Is the Topcat calculated CG the same as the Loadmanager's CG? And is the Topcat callculated trim the same value as the FMC calculated trim?
This is where I think something is different, or the OP is going way past Vr to accomplish this.

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What ever happened to "Piloting" a plane?
ok, I give up on this ... Just wondered why these two planes behave different.I have not said I'd like to start automatically or do a full automatic flight ... Shocked.gif

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I'm not trying to bash you in any way, but comparing these two jets is like apples to oranges. No commercial airplane should lift off by itself. This is why we have a Vr speed. happy.png

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This is where I think something is different, or the OP is going way past Vr to accomplish this.
TOPCAT and MD11 datas are nearly the same (have you never used TOPCAT?), difference is in just very slight values after the comma... And yes, again, I passed VR, but plane was taking off before runway was ending ... (what was not too much later)
No commercial airplane should lift off by itself.
So, seems we have an issue with the MD11 here ...

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In some conditions and in some aircrafts, you can experience slight nose up tendency, but you have to pull your stick/yoke at Vr. Simple as that Lj. Prodanovic

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How do you load the plane? Do you use the Loadmanager?
with TOPCAT ...TOPCAT generates the payload and fuel must be added via the PMDG menu.Numbers match nearly exactly the same as it is with the load manager...Don't you know TOPCAT?

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In some conditions and in some aircrafts, you can experience slight nose up tendency, but you have to pull your stick/yoke at Vr. Simple as that Lj. Prodanovic
Exactly. I have never had this problem with the MD-11. There is something wrong with your calculations or the aircraft configuration.

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Yes I know the main functions of TOPCAT but I can' afford it. unsure.pngMight you try to takeoff automatically past Vr without using TOPCAT to load the plane. Only the Loadmanager. So you can figure out if it is a plane or a TOPCAT issue wink.png

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Ok, but back on topic- No, you should have to pull the nose up at rotate. If you don't have to then there is something wrong with the calculations or the configuration.

...takeoff automatically...
Waiting.gif

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I know what he is talking about as I have the MD-11X and 747-400X as well. If you set the correct flaps and trim and zoom down the runway past VR speed the plane will lift off itself if you have a long runway. Course by that time you probably going about 190 or 200 knots and way past Rotation speed and exceeding the rated speeds for the tires. With the 737-NGX when setting flaps and trim correctly it seems to take a lot of pull back on my X52 Pro Stick to get the bird rotated. This is probably cause the 737-NGX is the first plane to actually model everything like the real aircraft and were not used to that and way other planes behave in FS.

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Nick I know you have to pull back the stick to take off, and you never take off automatically. I meant, with taking off automatically, the mentioned issue that the plane lifts of ground without pulling the yoke.

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As I understood, you experienced nose up tendency so you left it to take off alone, while passing Vr. At Vr, that is very slight tendency, but as aircraft building speed its possible that airplane take off automatically, but with much longer take off roll.So, you just need to help aircraft to rotate at Vr, and not to let it to waste complete length of rwy, that you can use in case of RTO. I think nothing is wrong with your performance calculations. Lj. Prodanovic

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So the question here is why an aircraft is not autorotating while another one does. They're different aircraft. Different aerodynamics. A Harrier can takeoff almost vertically while an F14 cannot. They're _different_ aircraft. I'm not quite sure about what exactly we're looking for in this post.

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So the question here is why an aircraft is not autorotating while another one does.
Yep, now you understand me... ;) I simply want to understand, if this behave is something, what all airplane have by design or if there's something very individual.Comparing a harrier and a F16...??? why not throwing in a Bell 206 ;) Ok, now I've learned, that it depends on the plane ...thanks for clarifying!

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