SC2Mapster

I would like to change the firebat beam to shoot backwards. Anyone know how to do this?

In this case the Firebat Attack model isn't actually a beam, I just now realized.

I tried switching it on the firebat weapon action actor. I reversed the launch site and impact site. Didn't seem to work for me.

That works, but when the unit moves south, it shoots into the ground, or left and right it shoots straight up in the air. 

I've actually attached the weapon effects to an air unit and acts as an engine effect which damages units caught in the blast. Kinda cool little effect I built, except the flames are not quite working yet. Only works properly when the ship is moving north.

Running this on a ground unit with a regular weapon it also does not work and has similar problems. It doesn't actually fire in the opposite direction unless the unit is firing directly north. I have tried both. I might add the exact actor you are referring to is called "SOP Rotation Explicit Harness". At least that is the only one I could find called "explicit".

Okay, 

I see I had to create a new actor of type Explicit rotation. But I have no idea how to adjust these values to get the desired result of shooting the flame in the opposite direction regardless of which way the unit faces.

Site Operation (Explicit Rotation) is a type of actor, not a specific site operation. You have to make one that rotates the flame actor according whatever angle you want.

Also, I don't think you need a weapon; you can just create the flame at the start of an effect or behavior.

Yes, I created an Explicit rotation actor and have been messing with the settings. From my observations, whatever rotation you set the flame to is constant, it does not change with the direction the unit is facing.

Thanks for the help. I believe I have solved this problem!