@daverave thanks for the link

I have tried using goal weights this way but I'm not having much. My problem is that I want to have the particles emit from the surface and then slowly move towards the start of the curve flow. Then move along the curve as they normally would until they reach the end and die off.

The problems that I am having are:

Getting the particles to move slowly from the surface to the curve and then follow the curve accurately.

If I do play with goal weights and the goal smoothness I can get this transition between the surface and the curve to slow down BUT the particles die earlier in the curve and they do not follow the curve. It seems that they just find some sort of average path through the curve rather then follow it predictably.

Really getting frustrated with this! Any help would be greatly appreciated!

Thanks

Chris