PZL-106 BT Turbo "Raven", a single engine, low wing agricultural aeroplane.
pzl106bt.zip at AVSIM.

Once you get past the blow-up plastic doll pilot figure, this is a superb model.
One of the best features is the cloud of Agridust it makes.
I got to thinking, and tweaked it a bit for the Fletcher, like so:

Once you've installed the effect from the "Raven",
you need to tweak the Fletcher's aircraft.cfg:
[SMOKESYSTEM]
//reference datum,longitudinal,lateral
//smoke.0=0.00, 0.00, 0.00, fx_Topdressing.fx
smoke.0=-0.00, -15.00, -7.60, fx_106_spray
smoke.1=0.00, -9.00, -4.80, fx_106_spray
smoke.2=0.00, -3.00, -2.00, fx_106_spray
smoke.3=0.00, -3.00, 2.00, fx_106_spray
smoke.4=0.00, -9.00, 4.80, fx_106_spray
smoke.5=0.00,-15.00, 7.60, fx_106_spray
I made the head of the spray arrow-shaped to try to emulate the central discharge hopper's chute.

