diff --git a/src/sg/SpaceGame.java b/src/sg/SpaceGame.java
index b53807d..8cc7d04 100644
--- a/src/sg/SpaceGame.java
+++ b/src/sg/SpaceGame.java
@@ -122,8 +122,17 @@ public class SpaceGame extends SimplePhysicsGame {
 
 		public void performAction( InputActionEvent evt ) {
 			rotation = dynamicNode.getLocalRotation().getRotationColumn(2);
-			appliedForce.set(rotation.mult(force)).multLocal( evt.getTime() );
-			dynamicNode.addForce(appliedForce);
+			switch(direction){
+			case 1:
+			case 2:
+				appliedForce.set(rotation.mult(force)).multLocal( evt.getTime() );
+				dynamicNode.addForce(appliedForce);
+				break;
+			case 3:
+				break;
+			case 4:
+				break;
+			}
 		}
 	}
 }
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