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hi swearingen, Thanks. Now I am clear about this.

Hello everyone: During searching for some information, I found out that the maximum takeoff weight and maximum landing weight are so different for an aircraft? take an example for A380: Maximum takeoff weight 560 tonnes Maximum landing weight 386 tonnes So if A380 takeoff with 560 tonnes...

Hi Guys: I am dealing with the normal commercial aircrafts. Especially A380, A320, B747 and B737. KENAT, thanks for your information. I will go though them now. :) Lisa

israelkk, KENAT: Thanks for your posts.:) I am wondering if there are empirical factors for the changes. Such as the angle of attack will be half, and the free stream velocity will probably keep constant. Lisa

Hello guys: After the air flowing past the wing of an aircraft, the flow will hit the horizontal tail and vertical tail. I am wandering how the angle of attack and free stream velocity will change? How much of the values I should use for the tails? Thanks a lot. :) Lisa

Hello guys: After the air flowing past the wing of an aircraft, the flow will hit the horizontal tail and vertical tail. I am wandering how the angle of attack and free stream velocity will change? How much of the values I should use for the tails? Thanks a lot. :) Lisa

Hi Guys; I have not come here for a long time. Thank you all for the detailed information. :) That is really helpful for me. Lisa

Hi TTFN: Thanks for your quick response. I am using Mathcad 13.1 I indeed have many images in the worksheet. They are all "x-y plot" images. Please tell me what I should do to reduce the saving time? :)

Hello everyone: When my Mathcad file getting bigger and bigger, the time to save the file getting larger too. The same as the time to calculate the whole worksheet! I am wonderring if there is some "preferences" change or anything else help me save it faster during editting?? Thanks a lot. :)

Hi guys: Thank you all very much! I am running Mathcad 13.0 in Microsoft Windows XP Professional Version 2002 Service Pack 2.

Dear all: If I click the "surface plot", the CPU will run to 100%, and then Mathcad is closed suddenly. I tried it in an empty sheet, it happened again! I do not want to reinstall it, because I need to tell the Administrator what happened and then....and then.....It will take a long time...

Dear everyone: If anybody here by chance know that what the maximum angles for aileron and rudder for a practical aircraft? I do not think that is -90deg and +90deg, is it right? Thanks a lot. lisa

Hi, faroiloance Thanks for your suggestion

Hi guys: I think all of you have seen the books: Fundamentals of Aerodynamcis(Anderson) and Low Speed Aerodynamcis(Kats). If anybody here know that how to draw a graph like the graphs (x,y,z coordinates, angles, wing geometry...) in these books? Which software I should use? Many thanks!

Hi guys, I have one simple question. What is the difference between Lifting-Surface and Panel methods? And if strip method is the same as Panel? Thanks in advance. :)