Attempts to fix new vehicle system

koptilnya/libs/constants.txt

@@ -6,3 +6,4 @@ TICK_INTERVAL = game.getTickInterval()
 RAD_TO_RPM = 9.5493
 RPM_TO_RAD = 0.10472
 UNITS_PER_METER = 39.37
+UNITS_TO_METERS = 0.01905

koptilnya/libs/entity.txt

@@ -1,3 +1,7 @@
+--@include ./constants.txt
+
+require('./constants.txt')
+
 function getLocalVelocity(entity)
     if not entity:isValid() then
         return
@@ -11,7 +15,5 @@ function calculateWheelInertia(entity)
         return Vector(0)
     end
 
-    local originalInertia = entity:getInertia()
-
-    return Vector(originalInertia)
+    return entity:getInertia():setY(0.5 * entity:getMass() * math.pow(entity:getModelRadius() * UNITS_TO_METERS, 2))
 end