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How to Use Asm2air Tool to Create Custom Flight Models


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How to Use Asm2air Tool to Create Custom Flight Models




If you are interested in creating your own flight models for Prepar3D, you will need to use Asm2air Tool, a tool that converts an assembler file into an AIR file that defines the aerodynamics and flight dynamics of your aircraft. In this article, we will explain what Asm2air Tool is, how it works, and how to use it to create your own flight models.




Asm2air Tool



What is Asm2air Tool?




Asm2air Tool is a tool that is included in the Prepar3D SDK, which is a collection of tools and documentation that allows you to create and modify content for Prepar3D. Asm2air Tool takes an input file that has an .asm extension and compiles it into an output file that has an .air extension. The .asm file contains the data that determines how your aircraft behaves in the simulation, such as its lift, drag, pitch, roll, yaw, engine, propeller, and control parameters. The .air file is the file that Prepar3D reads to load your aircraft's flight model.


How does Asm2air Tool work?




Asm2air Tool works by reading the data in the .asm file and converting it into binary format in the .air file. The .asm file has a specific format that uses token blocks to define the data. Each token block starts with "TOKEN_BEGIN name" and ends with "TOKEN_END". The name of the token indicates what type of data it contains, such as AIR_80_LIFT_PARAMS or AIR_CL_ALPHA. The data within each token block are based on specific offsets, which means that they have to be placed at certain positions within the block. The order of the token blocks within the file is not important, but they have to follow certain conventions and include certain required tokens for normal aerodynamics.


How to use Asm2air Tool to create custom flight models?




To use Asm2air Tool to create custom flight models, you will need to follow these steps:


  • Create or edit an .asm file that contains the data for your aircraft's flight model. You can use a text editor or a spreadsheet program to do this. You can also use one of the sample .asm files provided by Asm2air Tool as a template and modify it according to your needs. You will need to have some knowledge of flight dynamics and aerodynamics to understand and adjust the data.



  • Save your .asm file in a folder that also contains Asm2air.exe, which is the executable file for Asm2air Tool.



  • Open a command prompt window and navigate to the folder where you saved your .asm file and Asm2air.exe.



  • Type "Asm2air.exe input.asm output.air" where input.asm is the name of your .asm file and output.air is the name of your desired .air file. Press Enter to run Asm2air Tool.



  • If there are no errors or warnings, you should see a message saying "Done" and your .air file should be created in the same folder as your .asm file.



  • Copy your .air file to the folder where you have your aircraft's configuration file (.cfg) and model files (.mdl).



  • Edit your aircraft's configuration file and make sure that the sim= line matches the name of your .air file without the extension.



  • Launch Prepar3D and select your aircraft from the vehicle menu. You should be able to fly your aircraft with your custom flight model.



Note: You may need to tweak your .asm file and e0e6b7cb5c


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