After the files are placed into the "DATA" folder, the next step is to run the engine compiler program (called "CompEng"). The compiler does two things. First, it merges all your motor data files into one big file, and second, it creates a mass depletion curve for each of the motors. Finally, it stores the compiled file in a place where RockSim knows to look for it.
When running the engine compiler, it is important to compile all your motors, not just the new ones. If you don't, only the new motors will show up when you go to load a motor into a rocket. The old ones will have disappeared. But you can always go back and recompile your engine database again to get them back.
The biggest problem that I have seen by far is that users forget to place or save the engine files into the "DATA" folder. If you don't do this, the compiler program won't find the new motor. It only looks in the "DATA" folder for motor files.
The final step is to restart RockSim. This will load the new compiled engine data file into the program. If the program was running, instead of quitting and restarting the program, you can go into the "File" pull-down menu, and select "RELOAD ENGINE DATA."
That's it! You should now be up and running with your new motor files.
