thanks Ishmaru, Zoythrus,. Unfortunately what I'm after is two shells side by side both with particle smoke streams. I might be able to do it via the g3d file but it won't look as good.
Imperial faction (green) attack Tech Faction fleet (red):
Units, Tech: 2 x Dreadnoughts, 1 x Man-of-War
Imperial: 2 x Ironclads, 1 x Cruiser
The smoke effect is stolen from the Japanese Faction's cannon, and the projectile from the Tech Airship
ultifd, sorry man I don't know what you mean by transparent option