Quote:
Originally Posted by Big Dave
People do stuff for a reason, sport.
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Sure, but sometimes the reason is "well, we've always done it this way", or "it's not worth the bother of changing".
For an aviation-related example, consider winglets. NASA developed these back in the '70s, and showed that they reduced drag, but it's only in the last couple of years that most of the 737s flying over my place have begun to sport them. How come Boeing didn't put them on 20 years ago, but the airlines are doing it now?