Hey!I'm trying to edit Bob Scott's FDE v1.2H for the A340-200 with AirEd and I have one question...almost everything is absolutelly great but the taxi behavior is not. When I release the parking brake the plane starts rolling really fast. I want to keep it, like the real thing does but I want to decrease that reaction. Even with the MTOW the plane accelerates up to 30kts easily and I have to keep braking all the time to keep the airplane at 10-15kt.The other point is the fuel consumption in idle and the N1. Now it keeps 24.1% of N1 and the FF is 2440kg/h. It boders me less but also a point that I'd like to improve.Does anyone has any suggestions about what I can change? Maybe how to increase the drag with ground or how to reduce the idle thrust? Any idea is welcome!You may ask me why I'm not using the v1.2J, witch is the lastest. I'm not using this one because when you starts the engine the N1 goes up to 90% then reduces slowly to 20%. That's not real. And also the engine reactions are very "tight" and unstable. You touch the thrust and the N1 moves up and down several times until stabilizePS.: I know it's copyrighted but I trying to improve it for my personal use.

Hello,Had you already read this ?At Flightsim.com

FS2004 How To Tweak Flight Dynamics[ Download | View ]Name: howtweak.zip Size: 47,722 Date: 09-12-2005 Downloads: 1,819FS2004 How To Tweak Flight Dynamics. This pdf file is for people who want to learn, or learn more, about updating the flight dynamics of FS2004 aircraft. It won't tell you everything, but it will tell you some things the majority of flight simmers don't know about updating flight dynamics. By Bob Chicilo.

Regards.Gus.

When I release the parking brake the plane starts rolling really fast. I want to keep it, like the real thing does but I want to decrease that reaction. Even with the MTOW the plane accelerates up to 30kts easily and I have to keep braking all the time to keep the airplane at 10-15kt.

welcome to the 'great compromise' required in FDEs for on-ground behavior ... realistic taxi behavior and/v. realistic engine behavior. FS just doesn't easily allow for both. each designer finds are balance she/he finds best.read bob's comment on how he creates his FDEs -http://forums1.avsim.net/index.php?showtop...axi+performance--

Very true - each designer finds their own solutions. No two are identical; Bob Chicilo has one solution that works for him, Bob Scott has another, I have another; and so on. The key is that within a certain tolerance of 'accuracy', nobody is right and nobody is wrong unless there is something that is so obviously out of kilter that some kind of fix is in order.Problem is, it's a little like trying to complete a symphony that its composer has died before finishing - nobody could really authentically do it except him. Same with FDs, I think - that to effectively fix a FD set, the original author needs to radically revise it themselves (as they understand how they put it together in the first place), or else anybody trying to 'fix' it is up against it. It's important to understand what effect each parameter has on other linked items, or else you could end up with more issues than you started with. For anybody learning, I would seriously recommend staying away from just tweaking the .air file for a couple of reasons; 1) there are so many 'unknowns' in there that you could do real damage without knowing it, and 2) except in a very few cases, whatever you amend in the air file gets overwritten by the .cfg file anyway.As Bob Scott says, all FDs are a compromise, based on how the FS engine translates them into actions in the FS world. Ground performance vs. flight performance is one of the trickiest things to get anywhere near acceptable. For example, you can't just plug Boeing's numbers and measurements into a 747 FDE and expect FS to reproduce a 747's performance - that's just the start of a process of change, test, change, test, and so on which is why there is a 'flight tuning' section in the .cfg file.I'd recommend making sure you understand the impact of both the .cfg and .air files in the newer sims, and pace Bob Chicilo's document referenced above, don't just rely on tweaking the .air file - see 2) above!;)

Very true - each designer finds their own solutions.

Actually, both completes each other and I know that. I broke my head trying to reproduce the performance during the approach. The drag was excessive and the N1 during approach was ~70%. In real life it use to stay btw 55-60. That's the first thing I tryed to fix and I did. Now for the second and third thing I became to you guys exactly because I don't want to mess Bob's work up. I just want to improve what is already good.Sometimes I want to punch myself for not saving my old A330 before formating the pc. I just forgot...but anyway...I'll read that documentation scoob said and I tell you what I get.Thank you all for the replies.