With plane crashes at hundreds of mph, the crash is so violent and the G's are so high large structures are ripped apart. I think humans have survived the 10 to 12 G range. The acceleration of gravity is 32.2 ft/s 2 so the G's = 626k / 32.2 = 19,440 G. Assuming it de-accelerated linearly, the average speed would have been half of the initial velocity so 2/970 = 0.00103 s was the stopping time.Īcceleration = (V1-V2) / t so (645 ft/s - 0 ft/s) / 0.00103 s = 626,000 ft/s per s. Acceleration is the change in velocity divided by the time the change took.Ĥ40 mph is 645 ft/s so it'd take 1/970 of a second to go 8 inches. What I found in news articles was that the black box was found buried 8" deep and the plane collided with the mountain at 710 km/hr or about 440 mph. The very front of the plane might experience that but then the rest of it would crumple like a concertina and break apart into bits, each of which would experience a completely different force.įor clarity I want to specify that this is not my area at all and you shouldn't use my simplistic 200G figure for anything other than idle thought. In real life this figure isn't accurate at all, because the mountain will have recoiled slightly and mainly because the plane isn't a rigid object. ![]() The heaviest G-forces survived by a person is about 25. For comparison, an extremely intense turn in a fighter jet is about 10Gs, but obviously doesn't also involve an impact with a mountain. Dividing this by 9.81 (acceleration due to gravity) is 197, so let's say 200Gs. 700kph is 194 metres per second, so the acceleration is ten times this, 1940 metres per second per second. To try and put a number on your question, I would estimate that a plane hitting a mountain comes more or less to a dead stop in a tenth of a second. 1G is the force you experience due to Earth's gravity (despite not changing speed, confusingly.) "G-force" is simply a measure of acceleration, or change in speed over time. It's not really easy to calculate in any sort of meaningful way. ![]() Limit the use of engineering jokes.Ĭall for Engineers: Tell us about your job! (16 July 2020)Ģ020 List of engineers willing to be interviewedĢ019 List of engineers willing to be interviewed No low-effort one-liner comments, memes, or off-topic replies. Answers must contain an explanation using engineering logic, and assertions of fact must be supported by links to credible sources.īe substantive. Racism, sexism, or any other form of bigotry will not be tolerated.ĭon't answer if you aren't knowledgeable. All users are expected to behave with courtesy. Note that questions must still be specific to engineering and not a general opinion survey.īe respectful to other users. Mechanical, Electrical, Civil, Chemical, and Computer are reserved for technical questions only.ĭiscussion can be used for general questions that apply to multiple disciplines, including some workplace topics. ![]() ![]() Review the wiki prior to posting.Īvoid questions that can easily be answered by searching on the internet.Īvoid questions that have already be answered by a post in the FAQ section of the wiki. Most general career related questions should be placed in the Monday Career Megathread. Post titles must be a question about engineering and provide context - be specific. Call for Engineers: Tell us about your job! (2020) New to AskEngineers? Read our subreddit rules and FAQ page before posting! Topic Filters
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