Thanks guys. Much appreciated.
Yes Dave, it is MMB's fog generator with an added voltage increaser PCB. It raises the input volts to 24 volts and pushes out a bit too much smoke, so today I am reducing the voltage on the fan to slow it down. When I accelerate the 'plume' goes up to the ceiling as a thin line. On tick over its feint but when the throttle is increased by a quarter and then reduced to stop I get the smoke rings Mr B. Looks good in the workshop but will probably not be seen much out on the lake. Hence all the discussions on 'darkening, the plumes, recently published. I shall not be adding anything as I don't want the boat covered in a sticky mess.
I have been collecting 'Louisiana music' for the sound generator, so that should be fun when we get around to making the film.
Cheers
ken