diff --git a/data/batvio.lua b/data/batvio.lua
index d89353b..ea9694b 100644
--- a/data/batvio.lua
+++ b/data/batvio.lua
@@ -41,7 +41,24 @@ function batvio.draw()
     local curr_sf = surf.source()
     surf.source(tiles2)
     local scr_x, scr_y = viewp:screen_coords( batvio.x, batvio.y )
-    draw.surf(0,80,batvio.w,batvio.h,scr_x,scr_y,batvio.w,batvio.h,batvio.flip)
+    local motor_pos = scr_x
+    local cabina_pos = scr_x+32
+    if batvio.flip then
+        motor_pos = scr_x + batvio.w-32
+        cabina_pos = scr_x
+    end
+    -- foc del propulsor
+    if batvio.step % 2 == 0 then
+        pal.subpal(3,0)
+        pal.subpal(7,0)
+        pal.subpal(8,0)
+    end
+    draw.surf(0,80,32,batvio.h,motor_pos,scr_y,32,batvio.h,batvio.flip)
+    pal.subpal(3)
+    pal.subpal(7)
+    pal.subpal(8)
+    -- resta de l'avio
+    draw.surf(32,80,batvio.w-32,batvio.h,cabina_pos,scr_y,batvio.w-32,batvio.h,batvio.flip)
     surf.source(curr_sf)
 end
 
@@ -49,5 +66,5 @@ function batvio.hit()
 end
 
 function batvio.update()
-
+    batvio.step = batvio.step +1
 end
\ No newline at end of file