I'm trying to create an effect for a game in which the character will stomp the ground and a dust wave is created. So fave I've set my velocity to a vector uniform curve with Max:180, 180 0 and Min:-180, -180, 0. This gives a nice circular burst (I'm using burst...) but Ideally I want all the particles to travel the same distance from the centre, something which isn't happening. Is there any way to better control the "speed" of the particles?