Why can't humans fly? - By MITK12Videos
Transcript
| 00:02 | Hi , my name is jade and I'm Lauren were | |
| 00:05 | PCBs student and we're saying genetics in art class . | |
| 00:08 | And we want to ask you a question , is | |
| 00:12 | it genetically possible and growing on your back and be | |
| 00:16 | able to fly ? Hi , I'm dr sara thornton | |
| 00:19 | and I'm a biologist here at MIT . If you | |
| 00:22 | haven't already seen the videos about how we would build | |
| 00:24 | a human with wings , I really recommend that you | |
| 00:26 | watch this video , but even if you can make | |
| 00:29 | a human with wings without human , be able to | |
| 00:31 | fly . Professor Pereira is going to answer the other | |
| 00:34 | half of your question . My name is Jaime Pereira | |
| 00:37 | . I am a faculty member here in the department | |
| 00:40 | of aeronautics and astronautics at MIT . Humans obviously cannot | |
| 00:44 | fly and the reason is because they've been able to | |
| 00:48 | successfully develop and reproduce and thrive without having to fly | |
| 00:52 | unlike birds that required flying in order to be able | |
| 00:55 | to survive and develop . From an engineering perspective , | |
| 00:59 | on the other hand , we can look at what | |
| 01:01 | are the shortcomings of the human body in order to | |
| 01:03 | be able to fly . And the first one that | |
| 01:06 | comes to mind is is essentially the shape it has | |
| 01:09 | . We are very heavy relative to the surface that | |
| 01:12 | we have , and this surface is very important because | |
| 01:15 | in order to fly you need to be able to | |
| 01:16 | generate aerodynamic forces and that can only be done . | |
| 01:20 | If you have sufficient surface , you look at birth | |
| 01:22 | . The ratio of going surface to the to the | |
| 01:25 | weight is much larger than the surface of our bodies | |
| 01:29 | relative to our weight . If you look at a | |
| 01:31 | large bird like an albatross , it would have a | |
| 01:34 | wingspan of about two metres and weigh approximately 20 kg | |
| 01:39 | . two m is about the wingspan we might have | |
| 01:42 | with our open arms if we were to think of | |
| 01:44 | our arms . His wings , but obviously we are | |
| 01:45 | a lot heavier than 20 kg . The dazzlers aircraft | |
| 01:49 | , which is a human powered aircraft was built here | |
| 01:52 | a few decades ago . At that time , it | |
| 01:54 | held the world record for human powered flight . It | |
| 01:57 | flew for about 100 kilometers or perhaps even more essentially | |
| 02:00 | . What you have here is a human peddling . | |
| 02:03 | But what is around the human is an aircraft which | |
| 02:05 | is about 30 40 kg . And a wingspan is | |
| 02:09 | probably of the order of 15 m maybe , and | |
| 02:12 | that's the type of surfaces that it would take to | |
| 02:15 | lift a human . If we really were not to | |
| 02:18 | go to wings of this size and we were to | |
| 02:20 | stay with the smaller wings , that would be possible | |
| 02:23 | if we were able to fly faster . But in | |
| 02:26 | order to fly faster than the the energy consumption will | |
| 02:29 | be quite significant . The faster you fly , the | |
| 02:32 | more energy you need and the less wings you need | |
| 02:34 | to fly , say in a bird like class , | |
| 02:37 | you would need a significant amount of energy , and | |
| 02:40 | our bodies are just not created to to deliver this | |
| 02:44 | amount of energy a bad , but it about each | |
| 02:47 | way , perhaps once or twice a day in order | |
| 02:50 | to be able to fly . So that's the amount | |
| 02:52 | of food intake that a bad would take . On | |
| 02:55 | the other hand , humans do not usually eat uh | |
| 02:58 | their way in food every day . In fact , | |
| 03:01 | they eat a lot less . So here you can | |
| 03:03 | see that the amount of energy that bad producers is | |
| 03:06 | much higher relative to their weight and that's something that | |
| 03:09 | would have to be addressed to make a body like | |
| 03:11 | that of a human to be able to fly . |
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