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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:217c546250d736c4a5ad9b469b73a9b7209b5ff1e5db79ce32388be8ee290870"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12: Structural components of aircraft"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.1 Pg.No. 390"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "D=4              #diameter of rivet(mm)\n",
+      "t_skin=2.5         #thickness of fuselage skin(mm)\n",
+      "t_strap=1.2          #thickness of straps (mm)\n",
+      "T=120               #shear stress (N/mm^2)\n",
+      "A=math.pi*D**2/4    #rivet area\n",
+      "Pfb=2*A*T\n",
+      "\n",
+      "b=Pfb/t_skin/12.5/10+4\n",
+      "print \"allowable rivet spacing = %2.1f mm \\n\"%(b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "allowable rivet spacing = 13.7 mm \n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.2 Pg.No.392"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "l1=20          #distace between A&D (mm)\n",
+      "l2=25          #distace between C&D (mm)\n",
+      "l3=75          #distace between C&force location (mm)\n",
+      "P=5        #external load(kN)\n",
+      "r=(l1**2+l2**2)**0.5\n",
+      "sum_r2=2*l1**2+4*r**2\n",
+      "\n",
+      "#eqn 12.6 S=Pe*r/Sum(r2)\n",
+      "Pe=P*l3\n",
+      "S=Pe/sum_r2*r\n",
+      "print \"Resultant shear force in the A and B = %2.2f kN\\n\"%(S)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Resultant shear force in the A and B = 2.45 kN\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file