diff --git a/notebooks/hotair-box.ipynb b/notebooks/hotair-box.ipynb
index f27beb4..0865f8c 100644
--- a/notebooks/hotair-box.ipynb
+++ b/notebooks/hotair-box.ipynb
@@ -30,7 +30,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 14,
    "id": "6ea87a15-f571-4611-8487-5b7556e2ef45",
    "metadata": {
     "extensions": {
@@ -68,7 +68,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 15,
    "id": "d075a994-76bb-46f7-bdfb-cc6ef449dc43",
    "metadata": {
     "extensions": {
@@ -107,7 +107,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 19,
    "id": "2f3b63fd-d5ea-40b6-a2f9-b31c84cfef36",
    "metadata": {
     "extensions": {
@@ -129,7 +129,7 @@
     {
      "data": {
       "application/vnd.jupyter.widget-view+json": {
-       "model_id": "3f07d16568084521b394d029bb354e83",
+       "model_id": "77a162e2f4de4b5fa24baba1400ed00b",
        "version_major": 2,
        "version_minor": 0
       },
@@ -137,18 +137,17 @@
        "VBox(children=(FloatSlider(value=2.0, description='Width [m]:', layout=Layout(width='500px'), max=5.0, min=0.1…"
       ]
      },
-     "execution_count": 9,
+     "execution_count": 19,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "def f(width,height,depth,airTemp,hotAirTemp,coatDens):\n",
+    "def f(width,height,depth,airTemp,hotAirTemp,coatDens,tapeDens):\n",
     "    \n",
     "  \n",
     "    out=widgets.Output(layout={'margin': '10px 10px 10px 20px'})   \n",
     "    with out:    \n",
-    "        print(\"\\n\")\n",
     "    # Volume\n",
     "        volume = width * height * depth\n",
     "        print( \"Volume: {:.2f} [m3]\".format(volume)) \n",
@@ -158,6 +157,11 @@
     "    # Coating density (protective film for painting): 300g / 4x5m = 15g/m2       \n",
     "        coatingWeight = coatDens * area\n",
     "        print( \"Coating weight: {:.2f} [g]\".format(coatingWeight))   \n",
+    "    # adhesive tape density : average 2g/m   \n",
+    "        tapeLength = 2 * width + 4 * height\n",
+    "        tapeWeight = tapeDens * tapeLength\n",
+    "        print( \"Adh.tape length: {:.2f} [m]\".format(tapeLength))          \n",
+    "        print( \"Adh.tape weight: {:.2f} [g]\".format(tapeWeight))          \n",
     "    # Lift per volume g/m3  \n",
     "    #    airDens = dens_temp_func( airTemp )\n",
     "    #    hotAirDens = dens_temp_func( hotAirTemp )    \n",
@@ -169,13 +173,12 @@
     "        totalLiftForce = lift * volume\n",
     "        print( \"Total lift force: {:.2f} [g]\".format(totalLiftForce))    \n",
     "    # Free lift force totalLiftForce - coatingWeight \n",
-    "        freeLiftForce = totalLiftForce - coatingWeight\n",
+    "        freeLiftForce = totalLiftForce - coatingWeight - tapeWeight\n",
     "        if freeLiftForce < 0:\n",
     "            color = 'red'\n",
     "        else:\n",
     "            color = None\n",
     "        print( \"Free lift force:\", colored(\"{:.2f} [g]\".format(freeLiftForce),color))  \n",
-    "        print(\"\\n\")\n",
     "\n",
     "    \n",
     "    box = Mesh(geometry=BoxBufferGeometry(\n",
@@ -218,6 +221,7 @@
     "airTemp=widgets.FloatSlider(min=-40, max=35, step=1.0, value=10.0, description='Air temp.[°C]:',readout_format='.0f',layout=layout,style=style) \n",
     "hotAirTemp=widgets.FloatSlider(min=-40, max=55, step=1.0, value=35.0, description='Hot air temp.[°C]:',readout_format='.0f',layout=layout,style=style)\n",
     "coatDens=widgets.FloatSlider(min=1, max=50, step=1.0, value=15.0, description='Coating density [g/m2]:',readout_format='.0f',layout=layout,style=style) \n",
+    "tapeDens=widgets.FloatSlider(min=1, max=20, step=1.0, value=2.0, description='Adh. tape density [g/m]:',readout_format='.0f',layout=layout,style=style) \n",
     "\n",
     "\n",
     "w = widgets.interactive_output(f, {\n",
@@ -226,12 +230,13 @@
     "                                    'depth' : depth,\n",
     "                                    'airTemp' : airTemp,\n",
     "                                    'hotAirTemp' : hotAirTemp,\n",
-    "                                    'coatDens' : coatDens\n",
+    "                                    'coatDens' : coatDens,\n",
+    "                                    'tapeDens' : tapeDens\n",
     "                                }\n",
     "                            )\n",
     "\n",
     "\n",
-    "widgets.VBox([width, height, depth, airTemp, hotAirTemp, coatDens, w])\n"
+    "widgets.VBox([width, height, depth, airTemp, hotAirTemp, coatDens, tapeDens,  w])\n"
    ]
   },
   {