Place this in the init file :

[av8b_3, false, 15, 180, 350, 10, 0.11, [getMarkerPos "taxi1",getMarkerPos "taxi1_7",getMarkerPos "taxi_align_rw1", getMarkerPos "takeoff_rw1"], -0.22008, 1, 62, true, ""]execVM"mando_takeoff2.sqf"

av8b_3..............................= vehicle name
false..................................= Vertical takeoff? (true/false)
15.....................................= Taxi max speed in km/h (> 0 and < 31 Km/h)
180...................................= speed in Km/h to reach before raising the nose
350...................................= final speed in Km/h to reach after climb starts
10.....................................= Max nose up angle while climbing in degrees (10 ~ 89)
0.11..................................= acceleration factor (use values between 0.05 and 0.2)
[getMarkerPos "taxi1",...].= Array of taxi positions (last one is take off one, at least one must exist)
-0.22008...........................= Take off direction in degrees (Direction the plane will use for final take off run)
1.......................................= Number of crew members inside the plane before starting take off procedure
62.....................................= Number of seconds to wait idle after all crew is inside
true..................................= Radio comms (true/false)
"".....................................= Ejection SQF script or "" if none, any script receiving a single argument, the plane.
(The ejection script is not implemented and not included....so far...)
(Mando_land is included but not implemented)