Particle effect question

Hello, I have a few particle effects of jet flames. They start from the right side and go left. But, I have ships that are going from right to left so I want to flip the particle effect over the x axis in order to put it on them. Is there a way to do this evenly? I came across a way to flip it at the base through editing the particles properties by using a scroll er, but this is very inaccurate in doing it proportionately so I would prefer another method.

Thank You,
Ryan