Engineering Engines (Science Out Loud S1 Ep 6) - By MITK12Videos
Transcript
| 00:0-1 | hundreds of years ago James WAtt decided that my friend | |
| 00:03 | Helga could lift £550 a foot in the air in | |
| 00:09 | one second and that's the definition of a horsepower . | |
| 00:13 | This lawnmower has six hp . This car has 130 | |
| 00:19 | hp . This is a 231 power . Mhm . | |
| 00:26 | And this jet has 85,000 hp . All of these | |
| 00:31 | engines produce power by forcing a mixture of fuel and | |
| 00:33 | air into a tight space and then burning it . | |
| 00:36 | But they do it in different ways . A car | |
| 00:40 | uses a piston engine . This is a piston engine | |
| 00:43 | that's been cut into a half so you can look | |
| 00:45 | into it . A mixture of fuel and air enters | |
| 00:48 | through these valves into this metal cylinder . It's compressed | |
| 00:51 | when the pistol pushes up onto it and then this | |
| 00:54 | mixture is burned through a spark plug , causing the | |
| 00:57 | mixture to expand and the piston comes back down and | |
| 01:01 | this happens over and over again . There are multiple | |
| 01:05 | pistons in a car and they're connected through a series | |
| 01:08 | of linkages to the wheel , causing them to turn | |
| 01:19 | provision . Yeah , yeah , it was a plane | |
| 01:28 | . So you might think it's courses cousin there's a | |
| 01:30 | jumbo jack , but actually they can to a car | |
| 01:35 | could be used as a gift in Egypt . Here | |
| 01:39 | is the piston engine , just like in the car | |
| 01:41 | , but instead of it being attached to the wheels | |
| 01:43 | , it's attached to the propeller . A small plane | |
| 01:46 | like this , Cessna actually weighs about the same as | |
| 01:48 | most cars . And so it needs about the same | |
| 01:50 | amount of horsepower to roll down the runway and get | |
| 01:52 | off the ground . But a Boeing triple seven with | |
| 01:55 | all its passengers , cargo and fuel is about 200 | |
| 01:59 | times the way to the Cessna . So it needs | |
| 02:01 | a lot more horses . You could provide that horsepower | |
| 02:05 | by using a ton of pistons , but you need | |
| 02:08 | 67 of the most powerful piston engines ever built to | |
| 02:11 | fly a triple seven at cruising speed . That won't | |
| 02:14 | work . What you really need is one engine that | |
| 02:19 | can produce enough horsepower to fly the plane . A | |
| 02:22 | turban engine is capable of much more horsepower than a | |
| 02:25 | piston engine because of the way it uses giant fans | |
| 02:28 | to compress the air At the front of the turbine | |
| 02:32 | engine is an intake fan , which spins and brings | |
| 02:35 | a huge amount of air into the front of the | |
| 02:37 | engine as we move backwards through the engine , a | |
| 02:40 | series of compressor blades makes that error more and more | |
| 02:44 | compressed until we get here and here fuel is introduced | |
| 02:48 | and burn , and that hot high pressure flow gets | |
| 02:51 | sent out the back of the engine and that makes | |
| 02:53 | the thrust of the engines . But at the same | |
| 02:55 | time that flow passes through a series of four or | |
| 02:59 | five turbine blades , and those blades are connected directly | |
| 03:02 | to a shaft at the middle of the engine . | |
| 03:04 | That shaft runs all the way back to the front | |
| 03:07 | and spins the intake fan . That's what keeps the | |
| 03:10 | engine running . We've gone from one horsepower to 290 | |
| 03:14 | horsepower Helga , I guess . We don't need you | |
| 03:17 | anymore . Run free , join your herd . That's | |
| 03:22 | Brandon . He's domesticated . Mhm . |
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