We've only done a few basic trial runs with the wind tunnel and the data collected so far is from the digital scales mounted under the front and rear axles and is proving reasonable accurate ...
I'm pretty sure we will test some sort of smoke .... was actually thinking of a smoke pellet in a barrel with a small bore flexible line to draw the smoke up to some sort of wand in the wind tunnel ...
I don't think the smoke will hang around in the workshop too long tho, the fan at the end of the wind tunnel is around 16" dia and draws air at 25mph !!!
