Usage:
   ObjectTemplate.SetGearDownEngineInput number

Argument values:

Description: For airplanes, the engine's RPM must be below this threshold before the plane's landing gear is lowered. The plane will need to be below the SetGearDownHeight, too.

To see Engine RPM, hit F8 to turn off radio tooltips (if you have them on), then hit ` (back-tick - left of the '1' key, aka tilde) to bring up console window. In the console window type:

 Console.ShowStats 1

Then press ` again to remove console window. You should see many internal stats on screen. Engine RPM is near the top of the bottom-right-most block of stats.

Engine RPM, and hence SetGearDownEngineInput values, are between -1 (reverse) and 1. A value of (around) 0 means the engine is stopped. Values used in BF 1942: 0.4 for the B17 and Corsair, 0.55 for all the rest.

Related properties: SetGearDownHeight, SetGearUpHeight, SetGearUpEngineInput

Used in object types (and how often in each type): LandingGear (69%)

Used in a total of 19 .con files: Objects.con

Parent directories of these .con files: objects/Vehicles, Bf1942/Levels

Example: (from objects/Vehicles/Air/HO229/Objects.con)
   rem *** HO229LandingGearL ***
   ObjectTemplate.Create LandingGear HO229LandingGearL
   ObjectTemplate.LoadSoundScript ../Common/Sounds/LandingGear.ssc
   ObjectTemplate.Geometry HO229_gear_left_m1
   ObjectTemplate.HasMobilePhysics 1
   ObjectTemplate.HasCollisionPhysics 1
   ObjectTemplate.HasResponsePhysics 1
   rem -------------------------------------
   ObjectTemplate.AddTemplate HO229Wheel_Left
   ObjectTemplate.SetPosition 0/-1.2/0
   rem -------------------------------------
   ObjectTemplate.SetMaxRotation 0/0/90
   ObjectTemplate.SetMaxSpeed 0/0/30
   ObjectTemplate.SetAcceleration 0/0/80
   ObjectTemplate.SetGearDownHeight 25
   ObjectTemplate.SetGearDownEngineInput 0.55
   ObjectTemplate.SetGearUpEngineInput 0.7