Archived

This topic is now archived and is closed to further replies.

Ben Cap

Realistic Taxi?

Recommended Posts

That's exactly what I was asking about the NGX. --But according to Mr. Colwill they are under NDA so they can't say anything. :(
Hey Ben. The devs can say all they want. I just dont want to overstep my boundary and slip and say something I shouldn't. JackColwill

Share this post


Link to post
Help AVSIM continue to serve you!
Please donate today!

LOL it almost seemed no one even noticed that he was tipped up like that. All the ground crew just going about their business. heheJackColwill

Share this post


Link to post

The NGX's taxi performance is the best I've personally seen in an FSX airliner - it is not perfect due to the sim.dll coefficient of friction issues so you may have to to apply thrust every once in a while to maintain your speed (it's not every couple seconds or anything, don't worry) but by and large it does taxi on idle thrust correctly. We are not going to hack dlls to "fix" it - we legally cannot do that to the sim.

Share this post


Link to post
LMAO.gif No one even cared hahaha Hope that guy (and his very expensive airplane) were okay.And Ryan - that sounds awesome; I can't wait to see what it is like to taxi a real NG! (basically)Regards

Share this post


Link to post

Does it slow down in turns in real life like most FSX A/C do?One of the things I love from the Leonardo Maddog is the way it handles on the ground, idle taxi even in turns, although I have no idea if that's realistic or not, or if the 737 NG is supposed to behave like that too

Share this post


Link to post
We are not going to hack dlls to "fix" it - we legally cannot do that to the sim.
Is there any way that I can do this myself? :(

Share this post


Link to post
Is there any way that I can do this myself? :(
There may be, but nobody will tell you on this forum unless they want to be banned, since it would be against the forum rules to offer advice that was illegal.Al

Share this post


Link to post
Is there any way that I can do this myself? :(
I do have this "corrected" DLL (I think).

Share this post


Link to post
Every aircraft I've flow except one will gladly taxi at idle power. Some even need a dab of brakes to keep the speed under control which isn't easy. It's tempting to ride the brakes but then you will risk them overheating. The only aircraft that needed more than idle thrust to keep going was an old 1972 C182N.Remember that especially jet engines are still producing a huge amount of thrust even at idle. Once a nice little challenger at idle maybe 100 ft. in front of me tried to flip the C172 I was getting ready to fly. A friend of mine did get flipped behind an MD-11 starting up (Thank you FDX). There was about 200ft. between the engine and the taxiway. Ah, the joy's of flying GA at a Class B field.
So u claim that you go forward without using any throttles??Also airplane in full stopped position?I think you need a little bit percente of using throttles forward and then to idle to roll out (taxi).(That's what I mean) Ofcourse you cannot taxi with (40%) throttle continuous all the way taxing. In these case, the speed will increase far above 20 knots.So you need throttles to idle.:(

Share this post


Link to post

How is this "hack" on the sim.dll file any different from "hacking"/"tweaking" the fsx.cfg file to improve performance? Personally, I see no difference and therefore no reason why it should be deemed illegal.

Share this post


Link to post
How is this "hack" on the sim.dll file any different from "hacking"/"tweaking" the fsx.cfg file to improve performance? Personally, I see no difference and therefore no reason why it should be deemed illegal.
Probably, I don't know though, because the EULA forbids it?

Share this post


Link to post
How is this "hack" on the sim.dll file any different from "hacking"/"tweaking" the fsx.cfg file to improve performance? Personally, I see no difference and therefore no reason why it should be deemed illegal.
+1

Share this post


Link to post
So u claim that you go forward without using any throttles??Also airplane in full stopped position?I think you need a little bit percente of using throttles forward and then to idle to roll out (taxi).(That's what I mean)
Most jet airliners will roll simply with the engines idling, which is why they have parking brakes and chocks etc. Whether they will actually set off from stationary though can depend on some other factors, for example, if the aircraft has been at the stand for a long time, the tires get a temporary flat spot because the nylon bands in the tire settle under the weight of the aircraft where it is in contact with the ground (bend some nylon or plastic when it is warm or cold and you will feel the difference). Those flat spots can often be felt on an airliner when it pushes back or sets off, especially in cold weather because the flat spot tends to remain until the tires have warmed up a bit from rolling along. So a well established flat spot from a tire that has been sat for a long time could actually act a bit like a chock and prevent the aircraft from initially rolling under idle power, which is why it might require a bit of thrust to get going, but a jet that has just landed and is light on fuel with warm tires might easily get rolling from a standstill with the throttles closed.A jet engine is not producing zero thrust when it is idling, in fact the a CFM 56 engine is at about 29 percent of N1 when the throttles at idle. The 'average' airliner jet engine will push out about somewhere 800 and 1,000lbs of thrust even when the throttles are at idle (so that can mean nearly 2,000lbs of thrust on a 737 even at idle), which doesn't sound a lot when you consider how much an airliner might weigh, but it's a bit like how you can push a two ton car and get it rolling, even though you could never actually lift two tons.Al

Share this post


Link to post
+1
Because the PMDG aircraft that we buy don't modify any code/files that aren't allowed by MS. Altering one of the app's dll files would fall in that category. Altering a file & wrapping it into a product to be sold for monetary gain without the original author's written permission has all sorts of copyright implications.That being said, someone could post how they altered this file, but it's at your own risk with no support from any software vendor, PMDG, Microsoft or any other.That's my understanding. I am not a lawyer.

Share this post


Link to post
Most jet airliners will roll simply with the engines idling, which is why they have parking brakes and chocks etc. Whether they will actually set off from stationary though can depend on some other factors,
Al, stop, please lets not muddle the issue with brakes, chocks, tire flat spots, etc. There is a static and dynamic coefficient of friction, it is elementary physics. To start rolling you need higher power to overcome the static coefficient which is always higher. So you pretty much always need temporary application of extra power/thrust - I need it in my Piper so do you in a Boeing.

Share this post


Link to post
Al, stop, please lets not muddle the issue with brakes, chocks, tire flat spots, etc. There is a static and dynamic coefficient of friction, it is elementary physics. To start rolling you need higher power to overcome the static coefficient which is always higher. So you pretty much always need temporary application of extra power/thrust - I need it in my Piper so do you in a Boeing.
Gosh, I must remember to tell all those people around the world using tie downs, chocks and parking brakes that they don't ever actually need to :( Al

Share this post


Link to post
Most jet airliners will roll simply with the engines idling, which is why they have parking brakes and chocks etc. Whether they will actually set off from stationary though can depend on some other factors, for example, if the aircraft has been at the stand for a long time, the tires get a temporary flat spot because the nylon bands in the tire settle under the weight of the aircraft where it is in contact with the ground (bend some nylon or plastic when it is warm or cold and you will feel the difference). Those flat spots can often be felt on an airliner when it pushes back or sets off, especially in cold weather because the flat spot tends to remain until the tires have warmed up a bit from rolling along. So a well established flat spot from a tire that has been sat for a long time could actually act a bit like a chock and prevent the aircraft from initially rolling under idle power, which is why it might require a bit of thrust to get going, but a jet that has just landed and is light on fuel with warm tires might easily get rolling from a standstill with the throttles closed.A jet engine is not producing zero thrust when it is idling, in fact the a CFM 56 engine is at about 29 percent of N1 when the throttles at idle. The 'average' airliner jet engine will push out about somewhere 800 and 1,000lbs of thrust even when the throttles are at idle (so that can mean nearly 2,000lbs of thrust on a 737 even at idle), which doesn't sound a lot when you consider how much an airliner might weigh, but it's a bit like how you can push a two ton car and get it rolling, even though you could never actually lift two tons.Al
I appreciate the explanation. :( Lots of great info.Best Regards,

Share this post


Link to post

You will need more thrust when you're taxing on a "hill".

Share this post


Link to post
How is this "hack" on the sim.dll file any different from "hacking"/"tweaking" the fsx.cfg file to improve performance? Personally, I see no difference and therefore no reason why it should be deemed illegal.
It's reverse engineering code - that's way different than editing a cfg file with things that are in plain text that is meant to be a method of configuring the sim. Everything in the CFG file is something Microsoft coded into the sim, it's not "hacking". Two totally different things legally.

Share this post


Link to post
Gosh, I must remember to tell all those people around the world using tie downs, chocks and parking brakes that they don't ever actually need to :(
No, They do need them I hope you can figure it out why :(

Share this post


Link to post
So u claim that you go forward without using any throttles??Also airplane in full stopped position?I think you need a little bit percente of using throttles forward and then to idle to roll out (taxi).(That's what I mean) Ofcourse you cannot taxi with (40%) throttle continuous all the way taxing. In these case, the speed will increase far above 20 knots.So you need throttles to idle.:(
I never said you didn't need a bit of extra thrust to start moving, just that I almost never need more than idle thrust while taxiing. Most of the time idle is too much and we need the brakes to keep the speed under control. But this is because the route from our ramp to the runways we usually use almost always gives us tailwinds on the ground.

Share this post


Link to post

Out of interest, this is exactly what it says in the real A320 SOP, which I had to produce. This from the TAXI page of the SOP:'THRUST LEVERS......AS REQDLittle if any power above idle thrust will be needed to get the aircraft moving, (40 % N1 maximum). Thrust should normally be used symmetrically. Once the aircraft starts to move, little thrust is required.The use of engine anti ice increases the ground idle thrust, so the pilot must use care on slippery surfaces.'Al

Share this post


Link to post
No, They do need them I hope you can figure it out why :(
Unless the aircraft is at or near it's mtow it is perfectly normal to start rolling on idle thrust, with NAI switched on you would actually have a harder job keeping the aircraft within taxi speed limits and brake temps down. Regarding the mod sim.dll - a simple google search should bring it up. I thought most people here would already be using it.

Share this post


Link to post
Unless the aircraft is at or near it's mtow it is perfectly normal to start rolling on idle thrust, with NAI switched on you would actually have a harder job keeping the aircraft within taxi speed limits and brake temps down. Regarding the mod sim.dll - a simple google search should bring it up. I thought most people here would already be using it.
can you help with how to modify the file? Im sick of having to use the throttles even at VERY light weight

Share this post


Link to post