My mate has a smoke system setup on his plane which has an inverted engine. When we tested the system on the stand with the plane upside down the smoke system worked fine. However when the plane is in flight it does not seem to work properly. We can see some smoke but just not as much as on the ground. I have a feeling its just because the plane is further away and the smoke isnt thick enough so is almost transparent.
If this is the case what can we use to create thicker smoke? We have been using kero but was wondering what diesel would be like? Or is there perhaps something else we can use?

Thanks,

Troy.