diff --git a/SelfPropelledArtilleryUnit/DrawingArtillery.cs b/SelfPropelledArtilleryUnit/DrawingArtillery.cs
index 38abc72..0ef8ae4 100644
--- a/SelfPropelledArtilleryUnit/DrawingArtillery.cs
+++ b/SelfPropelledArtilleryUnit/DrawingArtillery.cs
@@ -15,10 +15,18 @@ namespace Artilleries
         private int? _pictureHeight = null;
         private readonly int _artilleryWidth = 80;
         private readonly int _artilleryHeight = 50;
+
         public DrawingArtillery(int speed, float weight, Color bodyColor)
         {
             Artillery = new EntityArtillery(speed, weight, bodyColor);
         }
+
+        protected DrawingArtillery(int speed, float weight, Color bodyColor, int artilleryWidth, int artilleryHeight) : this(speed, weight, bodyColor)
+        {
+            _artilleryWidth = artilleryWidth;
+            _artilleryHeight = artilleryHeight;
+        }
+
         public void SetPosition(int x, int y, int width, int height)
         {
             if (x < 0 || x + _artilleryWidth >= width)
@@ -73,7 +81,7 @@ namespace Artilleries
             }
         }
 
-        public void DrawTransport(Graphics g)
+        public virtual void DrawTransport(Graphics g)
         {
             if (_startPosX < 0 || _startPosY < 0 || !_pictureHeight.HasValue || !_pictureWidth.HasValue)
             {