"arb" We won't lock threads without a valid reason. Usually, it's because things begin to get out of hand. I mean no hostility when I say this, but when people come in these support forums and start suggesting to others that they modify certain areas of the flight model just to stop a very minor thing from doing something they think it should not be doing...especially when it's an add on as complex as this...it does get very frustrating. Modifying 1 area can very well end up breaking 10 other different areas. I have mentioned it in the "PLEASE READ THIS" thread, that people who choose to modify ANY part of the aircraft, they are voiding any support they are entitled to. That can be a very big issue for us as there is nothing to stop that person or people from lying about changing something...then we can't reproduce the problem, and we are stuck with what to do to help...leading to many hours of wasted time. I have spent many MONTHS fine tuning just the engines with Jim writing thousands of lines of code around what I was doing, and then Jim putting the finishing touches in the flight model. When a part of the engine would not work, we would literally go back to the beginning and start again. Even changing the transmission losses could very well have an impact on the entire engine system because the code is referencing specific parameters of EVERY part of the engine specs within Planemaker. It really cannot be stressed enough to those people that choose to modify files. DO NOT change any part of the acf file or anything else in the package that pertains to the aircraft's functionality. If you do, you do so at your own risk of "breaking" something. It will only cause headaches for everyone involved. If there are problems, tell us, and we will research it and fix it if it needs to be fixed. Happy Flying.