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why are plane windows round
Bookmarked 513 weeks ago
we often learn the most from our failures this is particularly true for advancements in the field of engineering unfortunately for the engineers in the aviation industry the prices to pay for failure are high this will be a reoccurring theme in my videos trust me the flip-side of this unforgiving industry is that it consistently provides learning opportunities for engineers because failure is not an option when peoples lives are at riskone of the greatest examples of this occurred during the development of cabin pressurisation the problems caused by cabin pressurisation didnt develop until the introduction of the first commercial jet powered aircraft the de havilland comet it entered service in 1952 and initially proved to be a massive success but just one year into service catastrophe struck three comets suffered fatal mid-flight disintegrations and the entire fleet was grounded until the cause was identifiedthe root of the problem was double-edged the introduction of jet engines required planes to fly even higher in order to make the fuel hungry engines economically viable less drag in the upper atmosphere means less fuel is needed as a plane increases in altitude the external atmospheric pressure lowers to a greater extent than the internal cabin pressure this creates a pressure differential that causes the fuselage to expand ever so slightly engineers accounted for this but the effects of repeated pressure cycles over time were not well known at the time over thousands of cycles and metal begins to fatigue and cracks can form at high stress locationsthe effects of stress concentration were also not well understood at the time stress concentration occurs when the flow of stress is interrupted square windows in contrast to modern oval windows provide a significant barrier to the smooth flow of stress because of this stress peaks at the sharp corner of the window and this is exactly where investigators determined the origin of failure to bethese combined phenomenon proved to be fatal today all airliners feature oval windows to avoid this stress concentration and comprehensive fatigue testing is required before a plane can be approved by the faa we often learn the most from our failures this is particularly true for advancements in the field of engineering these are now two basic concepts that every materials engineer is taught these events allowed us to further our understanding of materials and prevent further failuresfor licensing rights contact me at mcmanusbrian15gmailcomask before stealing my content looking at you dailymail

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the fat thumb: using the thumb039s contact size for single-handed mobile interaction
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fat thumb is a research project of the interactions lab at the university of calgary canada by sebastian boring david ledo xiang 039anthony039 chen nicolai marquardt anthony tang and saul greenberg it will be presented at the mobile hci 2012 conference held in september in san francisco ca usamodern mobile devices allow a rich set of multi-finger interactions that combine modes into a single fluid act for example one finger for panning blending into a two-finger pinch gesture for zooming such gestures require the use of both hands: one holding the device while the other is interacting while on the go however only one hand may be available to both hold the device and interact with it this mostly limits interaction to a single-touch ie the thumb forcing users to switch between input modes explicitly in this paper we contribute the fat thumb interaction technique which uses the thumb039s contact size as a form of simulated pressure this adds a degree of freedom which can be used for example to integrate panning and zooming into a single interaction contact size determines the mode ie panning with a small size zooming with a large one while thumb movement performs the selected mode we discuss nuances of the fat thumb based on the thumb039s limited operational range and motor skills when that hand holds the device we compared fat thumb to three alternative techniques where people had to precisely pan and zoom to a predefined region on a map and found that the fat thumb technique compared well to existing techniques

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