So, i just finished working on an update of my trijet plane, i added stuff, blah blah. Here's where the bad stuff comes in. The thrust reversers (which were made by changing the powerMultiplier value to a negative in overload) They seem to work before, but for some reason they don't anymore after i saved the airplane.
@CruzerBlade nvm i already figured it out
Use a normal jet engine, rotate it so it facing backwards. Simple.