Originally Posted by
FlexibleResponse
You are correct (smoking?)...definitely not an area of my expertise.
Airshow smoke system ("your honour, it is my client's contention that his friend's aeroplane had developed engine trouble, so he was formating with said aircraft in order to ascertain the nature of the problem when he collided with the agricultural machinery...")
Think Stearmen had largely been retired from ag work by 1980, certainly in the USA.