Ive managed to get the vapour trails working and currently im just trying to fit the numbers to a few of my own planes (namely the POSKY A330-300)[sMOKESYSTEM]smoke.0=-900,-26.3,-77.4, fx_contrail_s.fxsmoke.1=-900,-26.3,77.4, fx_contrail_s.fx This is the coding that goes into the arcraft cfg file, but i need to know exactly what each number does. I think the second number is the position forward and behind a reference point on the plane. And the last number is the horizontal distance from the centre reference point...But what does the first number change???AND HOW do you change the verticle position of the trails to fit the wingtips????Help would be much appreciated, regardsMark.

Vapor trails are based on the &l;GeneralEngineData&r; section of the aircraft.cfg file and NOT the &l;SMOKESYSTEM&r; section. The entrys are similar to the following and are in decimal feet measured from the reference_datum_position.&l;GeneralEngineData&r; //(front to back, side to side, up and down)(y, x, z)engine_type=1Engine.0=3.836, -26.206, -5.15Engine.1=-94.295, 0.000, 21.133Engine.2=3.836, 26.206, -5.15fuel_flow_scalar=1.000&l;SMOKESYSTEM&r; //(front to back, up and down, side to side)(y, z, x)smoke.0=-3.107, -5.15, -26.206, fx_smoke_rx,smoke.1=-102.751, 21.133, 0.00, fx_smoke_rx,smoke.2=-3.107, -5.15, 26.206, fx_smoke_rx,Note the reversal of the x and z co-ords between the two.Hope this helps.