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really what a shockwave is is an

2
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instantaneous change in pressure and so

3
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that change of pressure papa gates

4
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through the air from the aircraft down

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to the ground and our ears hear that and

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this is the crew brief for since moved

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type 1 objectives for today is the

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real-time this is why I had the talk

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with Ralph's footprint in the rear

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cockpit of the f-18 we have 7 different

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recorders out in the field that we'll be

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using and we want to you know to record

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sonic booms and I will be the one

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communicating with the control room

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communicating with the rest of the

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project team as to the test points that

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that's affirmative then I repeat so my

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role is running the backseat and I have

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a tablet display is where the boom is

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saying the ground I'm giving the pilot

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feedback on speed up slow down just sort

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of get the boom where we you want to get

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your flight path in the right place in

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in space the scientists of course want

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this as accurately as possible we've got

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GPS receivers measuring things within at

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least 10 feet we aren't gonna hit 10

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feet accuracy every time except if we're

29
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lucky but we get as most as many of the

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parameters as close as we can the

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scientists can work the data out and see

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how see how we did but more importantly

33
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see how the algorithm did and see

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whether the displays working correctly

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three copies join 1.3

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over there this is the cockpit display

37
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for the cockpit interactive sonic boom

38
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display avionics or missus boomed up

39
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start to generate all the impact area

40
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where the Senate booms hit on the ground

41
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over here we had a bunch of sensors on

42
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the lakebed

43
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to measure the effect of the sonic games

44
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and for the tests we were looking at how

45
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the real-time display predicts the

46
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senate food where it hits when it hits

47
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and the intensity of the boom let's show

48
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them how the colors and we compare that

49
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to measurements on the ground look you

50
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got one we got one test point complete

51
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we did see is open house we're good to

52
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see the next row

53
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and that's fast we're gonna do what we

54
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call our low boom dive I'm familiar with

55
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it but the aircraft actually flies at

56
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about forty nine thousand feet

57
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subsonically does a dive an inverted

58
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dive to meet supersonic speeds and then

59
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recovers that's our little Bing dive if

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we use it a lot in our testing to

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simulate

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demonstrator a living aircraft might

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copy mark would PC boom and says boom

64
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does to compete where the booms going

65
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the knock number of the aircraft you

66
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have a certain shape of Mach cone kind

67
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of like a way coming off a motorboat

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would be a shaped wake but in an

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starting with Bravo please report what

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you heard so we're trying to do is

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design aircraft that produce quieter

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fine guns or as we're calling them low

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booms we're able to do that hopefully we

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can get some of the regulations change

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so that we can have sonic booms over