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diff --git a/Aircraft_Structures_for_Engineering_Students/Chapter04.ipynb b/Aircraft_Structures_for_Engineering_Students/Chapter04.ipynb
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--- a/Aircraft_Structures_for_Engineering_Students/Chapter04.ipynb
+++ /dev/null
@@ -1,95 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:6a67de7af4fe617483b9aefeefdb01f122e2016e5ab212db494104a83b9deeda"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 4.6 Pg.No.106"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "from __future__ import division\n",
-      "import math\n",
-      "\n",
-      "sum_FAFlBL=1263.6*10**6    # (N.mm)\n",
-      "sum_FAFlDL=880*10**6       # (N.mm)\n",
-      "E=200000                  # young's modulus (N/mm^2)\n",
-      "A=1800                    # area of each member (mm^2)\n",
-      "\n",
-      "#eqn 4.23 We=Wi\n",
-      "del_B=sum_FAFlBL/A/E\n",
-      "print \"\\ndeflection at point B =%2.2f mm\\n\"%(del_B)\n",
-      "\n",
-      "del_D=sum_FAFlDL/A/E\n",
-      "print \"deflection at point D =%2.2f mm\\n\"%(del_D)\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "\n",
-        "deflection at point B =3.51 mm\n",
-        "\n",
-        "deflection at point D =2.44 mm\n",
-        "\n"
-       ]
-      }
-     ],
-     "prompt_number": 19
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "from __future__ import division\n",
-      "import math\n",
-      "\n",
-      "ext_load=30    #external load(kN)\n",
-      "\n",
-      "#eqn 30*4*del_vB/3=F_BA*del_vB\n",
-      "F_BA=ext_load*4/3\n",
-      "print \"\\nforce in the struss AB is = %3.2f kN\\n\"%(F_BA)"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "\n",
-        "force in the struss AB is = 40.00 kN\n",
-        "\n"
-       ]
-      }
-     ],
-     "prompt_number": 18
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file