diff --git a/engine.lisp b/engine.lisp
index 5a92c59..fb538fc 100644
--- a/engine.lisp
+++ b/engine.lisp
@@ -2,26 +2,31 @@
 
 (defclass engine-object (game-object)
  ((start-time :initarg :start-time :accessor start-time :initform 0)
+  ;; time till fully active
   (activation-time :initarg :activation-time :accessor activation-time :initform 0)))
 
 
+(defmethod activate ((object engine-object) start-time)
+  (setf (start-time object) start-time))
+
 (defclass engine-model (model)
   ((template-vertices :initarg :template-vertices :accessor template-vertices :initform nil)
    (template-colors :initarg :template-colors :accessor template-colors :initform nil)))
 
 (defun generate-step-2d-array (2darr time)
   (let ((len-arr (length 2darr))
-	(len-row (length (aref 2darr 0))))
+	(len-row (length (first 2darr))))
     (make-2d-array len-arr len-row
-		   (loop for i from 0 to len-arr collecting 
-			(loop for j from 0 to len-row collecting
-			     (let ((item (aref (aref 2darr i) j)))
-			       (if (listp item)
-				   (converge (first item) (second item) (third item) time)
-				   item)))))))
+		   (loop for row in 2darr collecting 
+			(loop for item in row collecting
+			     ;(let ((item (aref (aref 2darr i) j)))
+			     (if (listp item)
+				 (converge (first item) (second item) (third item) time)
+				 item))))))
 
 ; take 2 seconds to fully fire
 (defmethod regen-model ((model engine-model) time)
+  (format t "REGNE MODEL~%")
   (setf (vertices model) (generate-step-2d-array (template-vertices model) time))
   (setf (colors model) (generate-step-2d-array (template-colors model) time)))
 
@@ -38,9 +43,9 @@
     ((0 255 2) (0 255 2) (64 255 2))))
 
 
-(defmethod draw ((model engine-model) time) 
-  (if (and (generated-model model) (< (- time (start-time model)) (activation-time model)))
-      (regen-model model time))
+(defmethod draw ((object engine-object) time) 
+  (if (< (- time (start-time object)) (activation-time object))
+      (regen-model (model object) time))
   (call-next-method))
 	    
       
diff --git a/flight-sim.lisp b/flight-sim.lisp
index 8aff019..f624aa6 100644
--- a/flight-sim.lisp
+++ b/flight-sim.lisp
@@ -147,7 +147,8 @@
 
 (defun thruster-on (key)
   (case key 
-  ;  ((:sdl-key-w) ; + z
+    ((:sdl-key-w) ; + z
+     (activate-attachment *self* :thruster (wall-time)))
    ;  (progn
        ;(setf (aref (acceleration (motion *self*)) 2) (- *acceleration*))
        ;(engine-start (engine *self*) (wall-time))))
@@ -167,7 +168,8 @@
 
 (defun thruster-off (key)
   (case key 
-    ;((:sdl-key-w) ; + z
+    ((:sdl-key-w) ; + z
+     (deactivate-attachment *self* :thruster))
     ; (progn
     ;   (setf (aref (acceleration (motion *self*)) 2) 0)
     ;   (engine-stop (engine *self*))))
@@ -256,13 +258,12 @@
 	 :attachments 
 	 (list :thruster
 	       (make-instance 'engine-object
+			      :activation-time 2
 			      :model (make-instance 'engine-model 
 						    :template-vertices *thruster-vertices*
 						    :template-colors *thruster-colors*)
 			      :body (make-instance 'body
-						   :coords (vector 0 0 3)))))))
-	
-  
+						   :coords (vector 0 0 3))))))
 			      ;:engines (list :engines (list :thrust 
 				;		       (make-instance 'engine-object 
 				;				      :motion (make-instance 'motion :coords (vector 0 0.5 3.0))
diff --git a/objects.lisp b/objects.lisp
index 71493ad..538b1c5 100644
--- a/objects.lisp
+++ b/objects.lisp
@@ -12,10 +12,19 @@
 ;(defmethod coords ((object game-object))
 ;  (coords (body object)))
 
-(defmethod activate ((object game-object) sym start-time)
+(defgeneric activate (object start-time))
+(defgeneric activate-attachment (object sym start-time))
+
+(defgeneric deactivate (object))
+(defgeneric deactivate-attachment (object sym))
+
+(defmethod activate-attachment ((object game-object) sym start-time)
   (push sym (active-attachments object))
   (activate (getf (attachments object) sym) start-time))
 
+(defmethod deactivate-attachment ((object game-object) sym)
+  (setf (active-attachments object) (remove sym (active-attachments object))))
+
 (defmethod draw :before ((object game-object) time)
   (gl:push-matrix)
   (gl:translate (aref (coords (body object)) 0) (aref (coords (body object)) 1) (aref (coords (body object)) 2))
@@ -27,4 +36,6 @@
   (gl:pop-matrix))
 
 (defmethod draw ((object game-object) time)
-  (draw (model object) time))
+  (draw (model object) time)
+  (loop for a in (active-attachments object) do
+       (draw (getf (attachments object) a) time)))