Bullets travel fast enough to cause sonic booms, as do the tails of whips. The boom sweeps over everything below it—a kind of sonic broom that is about a mile wide for every thousand feet of plane altitude. NASA began working on supersonic transport upon its founding, in , eventually settling on a design by Boeing.
But these initiatives started before sonic booms were fully understood. A clearer picture emerged in , when Operation Bongo II created more than a thousand sonic booms over Oklahoma City. People complained of interruptions to their sleep, conversations, and peace of mind, and about the occasional crack in plaster or glass. By the end, about one in four said that they could not learn to live with the noise. These studies, along with tens of thousands of claims against the Air Force for property damage—horses and turkeys had supposedly died or gone insane—led the F.
There are many reasons why the Concorde, which flew for the first time in , stopped flying in Among them is the fact that the service was allowed to reach supersonic speeds only over the ocean. This month, United Airlines announced plans to purchase planes from Boom Supersonic, a Denver startup that aims to produce a new generation of supersonic passenger planes.
According to Larry Cliatt, NASA's acoustic testing technical lead for the X, all those features combine to make sure the shockwaves being produced midair are "well behaved. The XVS uses two cameras above and below the aircraft to create a real-time view of the front of the plane shown on an HD screen.
Now he's back in the air conditioning from the degree heat outside, where he was putting the flight sim through its paces. For Larson, the experience of flying with a cockpit window and using the XVS display isn't all that different. The benefit comes with combining the real-world view from the cameras with the kind of data you see on a monochromatic head-up display in a fighter jet.
The XVS lets pilots see flashing warnings or colored text over the horizon, things they wouldn't ordinarily see through a cockpit window. In , Lockheed will conduct initial flight tests to make sure everything is working as expected and the plane is flying with the right speed and altitude. Then Lockheed hands the keys over to NASA, which will begin "acoustic validation" testing in to ensure the sonic boom has been satisfactorily scaled back to a sonic thump.
This second stage of testing will involve sending the X up with an F fighter jet that will act as a chase plane, measuring the shockwaves being produced by the aircraft midflight. And perhaps most impressive of all, NASA will capture images of the shockwaves -- a process that's known as schlieren photography.
It's like threading a needle to get that gorgeous image. Schlieren images like this one can capture the shockwaves coming off supersonic aircraft midflight. But the big decider will be the sound on the ground.
In the acoustic testing phase, NASA will set up an array of microphones across a mile-long stretch of the Mojave Desert in California to measure the sonic thump and make sure it's as quiet as intended. Boom Supersonic Boom is making the world dramatically more accessible by…. Aviation Technology Aerospace Travel. Written by Boom Supersonic Follow. More From Medium. What Gravity Really Is. Parth Sarda. Hubble Spotted the Formation of a New Planet.
Branden Murphy. Up The Gravity Well. Thomas Wright. Starre Julia Vartan in Elemental. Dr Jaclyn Bell. Flights will be net-zero carbon and will use sustainable aviation United Airlines has plans to buy 15 supersonic jets from a company called Boom Supersonic. The planes will fly up Most modern passenger Passengers could fly from London to New York in The price. Talk about the connection between each pair of words in italics, and why the correct word is correct.
Supersonicpassengerplanescouldreturntotheskiesbeforetheendoft hisdecade. Thespeed ofsoundisMach1,whichis1, The ywillflyatatopspeedofMach1. Mostmodernpassen gerjetshaveacruisingspeedofjustover1,kph. Thenewplanescould greatlycutthetimeittakestoflyaroundtheworld. Passengerscouldflyfr omLondontoNewYorkinunderfourhours. ThejetsorderedbyUnitedAirlinesarecalledO verture. Theywillbethefirstsupersonicjetstomakecommercialflightss inceConcordestoppedoperatingin Concordewasjointlyoperate dbyBritishAirwaysandAirFrance.
ThecostofOvertureticketswillberou ghlythesameasregularbusinessclasstickets. ThepriceofaConcordetic ketwasover20timeshigherthaneconomyclasstickets,whichmeanton lythesuper-richcouldaffordone. Flightswillben et-zerocarbonandwillusesustainableaviationfuel. Share what you discover with your partner s in the next lesson. Show your work to your classmates in the next lesson. Did you all have similar things? Include imaginary interviews with people who are for and against this.
Read what you wrote to your classmates in the next lesson. Write down any new words and expressions you hear from your partner s. Write a newspaper article about the next stage in this news story. Give each other feedback on your articles. Read your letter to your partner s in your next lesson. Your partner s will answer your questions. Ask your students what they have read, seen or heard about this news in their own language. Ask students to male predictions of how this news might develop in the next few days or weeks, and then revisit and discuss in a future class.
Students role play a journalist and someone who witnessed or was a part of this news. Perhaps they could make a video of the interview. It has hundreds of ideas, activity templates, reproducible activities for:. Please look at page 26 of the PDF to see a photocopiable example of this activity.
0コメント