diff --git a/img/plane.bmp b/img/plane.bmp
index 58de2d4..b6717e2 100644
Binary files a/img/plane.bmp and b/img/plane.bmp differ
diff --git a/include/maths.h b/include/maths.h
new file mode 100644
index 0000000..a8cdcf2
--- /dev/null
+++ b/include/maths.h
@@ -0,0 +1,11 @@
+#ifndef MATHS
+    #define MATHS
+
+#define pi 3.14159265358
+#define pi_2 1.570796327
+#define pi_4 0.78539981635
+
+float cos(float x);
+float sin(float x);
+
+#endif
diff --git a/include/wings.h b/include/wings.h
index 1411b14..68596e0 100644
--- a/include/wings.h
+++ b/include/wings.h
@@ -1,11 +1,12 @@
 #ifndef WINGS
     #define WINGS
 
+#define MAX_MISSILES 4
+
 typedef struct Missile
 {
-    unsigned char dir;
-    short x[4];
-    short y[4];
+    unsigned char dir[MAX_MISSILES];
+    short distance[MAX_MISSILES]; // distance between the plane and the missile
 } Missile;
 
 typedef struct Plane
@@ -15,9 +16,9 @@ typedef struct Plane
     unsigned char dir;
 
     /* plane direction management
-    7      0     1
-    6    plane   2
-    5      4     3
+    3      2     1
+    4    plane   0
+    5      6     7
     */
 
     unsigned char life;
diff --git a/src/maths.c b/src/maths.c
new file mode 100644
index 0000000..f70832c
--- /dev/null
+++ b/src/maths.c
@@ -0,0 +1,28 @@
+#include "maths.h"
+
+#define MAX_TURN 24
+
+float cos(float x)
+{
+int a = 8 * MAX_TURN - 6;
+int b = 2 * MAX_TURN * (2 * MAX_TURN - 1); // 2n(2n-1)
+float s = 1;
+
+int i;
+
+x = x*x; // x²
+
+for(i = 0; i < MAX_TURN; i++)
+    {
+    s = 1 - x * s / b;
+    b -= a;
+    a -= 8;
+    }
+
+return s;
+}
+
+float sin(float x)
+{
+    return cos(x - pi_2);
+}
diff --git a/src/wings.c b/src/wings.c
index d369333..7c37c63 100644
--- a/src/wings.c
+++ b/src/wings.c
@@ -1,4 +1,5 @@
 #include "wings.h"
+#include "maths.h"
 
 #include "display.h" // bopti.h => images // tales.h => fonts
 #include "keyboard.h"
@@ -40,6 +41,7 @@ void init()
         planes[i].y = 12;
         planes[i].dir = i;
         planes[i].life = 100;
+
     }
 }
 
@@ -77,21 +79,21 @@ void menu()
 
 void update_frame()
 {
-    static unsigned char i;
+    static unsigned char i,j;
     static short decalx = 0, decaly = 0;
 
     gclear();
 
         switch(planes[0].dir)
         {
-            case 0 : decaly++; break;
+            case 0 : decalx--; break;
             case 1 : decalx--; decaly++; break;
-            case 2 : decalx--; break;
-            case 3 : decalx--; decaly--; break;
-            case 4 : decaly--; break;
+            case 2 : decaly++; break;
+            case 3 : decalx++; decaly++; break;
+            case 4 : decalx++; break;
             case 5 : decalx++; decaly--; break;
-            case 6 : decalx++; break;
-            case 7 : decalx++; decaly++; break;
+            case 6 : decaly--; break;
+            case 7 : decalx--; decaly--; break;
         }
 
     gimage_part(planes[0].x, planes[0].y, &plane, 16*planes[0].dir, 0, 16, 16);
@@ -106,9 +108,10 @@ void update_frame()
     {
         for(j = 0; j < MAX_MISSILES; j++)
         {
-        if(planes[i].missile.distance[j] > 0) // we load the missile to reach the target
+        if(planes[i].missiles.distance[j] > 0) // we load the missile to reach the target
             {
-            //gline(plane[0].x, plane[0].y, )
+                gpixel(planes[i].x + 8 + planes[i].missiles.distance[j] * cos(planes[i].missiles.dir[j] * pi_4), planes[i].y + 8 - planes[i].missiles.distance[j] * sin(planes[i].missiles.dir[j] * pi_4), color_black);
+                planes[i].missiles.distance[j]++;
             }
         }
     }
@@ -128,7 +131,7 @@ int game()
 
     int keys[3];
 
-    unsigned char i;
+    unsigned char i,j;
 
     timer_t *timer = NULL;
 
@@ -137,6 +140,7 @@ int game()
     timer_start(timer);
 
     gray_start(); // gray engine running
+
     init(); // initialisation
 
     while(1)
@@ -164,24 +168,26 @@ int game()
             }
         }
 
-/* we determine the direction of the plane*/
+// we determine the direction of the plane
 
         switch(sum)
         {
-            case KEY_UP : planes[0].dir = 0; break;
+            case KEY_RIGHT : planes[0].dir = 0; break;
             case KEY_UP + KEY_RIGHT : planes[0].dir = 1; break;
-            case KEY_RIGHT : planes[0].dir = 2; break;
-            case KEY_DOWN + KEY_RIGHT : planes[0].dir = 3; break;
-            case KEY_DOWN : planes[0].dir = 4; break;
+            case KEY_UP : planes[0].dir = 2; break;
+            case KEY_UP + KEY_LEFT : planes[0].dir = 3; break;
+            case KEY_LEFT : planes[0].dir = 4; break;
             case KEY_DOWN + KEY_LEFT : planes[0].dir = 5;break;
-            case KEY_LEFT : planes[0].dir = 6; break;
-            case KEY_UP + KEY_LEFT : planes[0].dir = 7; break;
+            case KEY_DOWN : planes[0].dir = 6; break;
+            case KEY_DOWN + KEY_RIGHT : planes[0].dir = 7; break;
         }
 
         if(fire) // put the screen on fire !
         {
-            planes.missiles.dir = planes[0].dir;
-            planes[0].missiles.distance[j] = 1; // fire unlimited
+            planes[0].missiles.dir[j] = planes[0].dir;
+            planes[0].missiles.distance[j] = 12; // fire unlimited (nearly)
+            j = (j < MAX_MISSILES ? j + 1 : 0);
+            fire = 0; // fire disable // this code line will depend if we shoot in continue
         }
     }
 }