"A pencil thick spider's silk thread is capable of stopping a Boeing-747 in full flight. "
To stop a 180,000 kg Boeing-747 flying 1080 km/h (300 m/s) in 300 meters one needs 1,440,000 million Araneus diadematus spiders or 3000 million Nephila spiders to make a one kilometre long thread with a diameter of 21.4 cm. If the plane comes to a stand still and all the passengers are thrown in the cockpit because of deceleration of 150 m/s2 (15 g) the temperature of the thread is 170 Celsius warmer if all the energy was converted into heat.
It is possible to stop the plane with a pencil thick thread. When the plane is flying at landing speed (80 m/s) and the thread is 30 km long. One needs 102,000 million Araneus diadematus spiders and the temperature rise is the same because the temperature rise is linear related with the breaking force. (To stop the plane at full speed the line should be 500 km long).
Monday, October 10, 2011
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