# mar19 - MIT OpenCourseWare http/ocw.mit.edu 6.055J 2.038J...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 6.055J / 2.038J The Art of Approximation in Science and Engineering Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 6.055 / Art of approximation 46 Therefore, planes and well-fed, migrating birds should have the same maximum range! Let’s check. The longest known nonstop flight by an animal is 11 , 570 km, made by a bar- tailed godwit from Alaska to New Zealand (tracked by satellite). The maximum range for a 747-400 is 13 , 450 km, only slightly longer than the godwit’s range. 6.2.4 Explicit computations To get an explicit range, not only how the range scales with size, estimate the fuel fraction β , the energy density E , and the drag coefficient C . For the fuel fraction I’ll guess β ∼ . 4 . For E , look at the nutrition label on the back of a pack of butter. Butter is almost all fat, and one serving of 11 g provides 100 Cal (those are ‘big calories’). So its energy density is Cal (those are ‘big calories’)....
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## This note was uploaded on 02/24/2012 for the course MECHANICAL 6.055J taught by Professor Sanjoymahajan during the Spring '08 term at MIT.

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mar19 - MIT OpenCourseWare http/ocw.mit.edu 6.055J 2.038J...

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