How should i do make particle have different emission angle and the same speed?

I tried to set Local Velocity of Randomize,like this:

But it will make particle have different speed.

And then,i set Start Angle,but it seems not work.Not change anything particle emission angle.

Have i any error setting?

thank you for your time.

I’m not sure if I understand. Are you trying to launch particles at in a specific direction? Or have them rotated at a specific angle?

The Start Angle determines the rotation of the particle when it is created.

The Local Velocity determines the direction the particle move in during it’s lifetime.

Thank very much dave,i want to set launch particles at in a specific direction,but i hope each particle has different direction.

Like this:

thanks again.