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Oh Larry rule changes shaping it was a

2
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new advanced in that it it cut down the

3
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drag on aircraft at high speeds and that

4
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was where the error once what's the

5
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cross sectional area of the airplane

6
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flying through the air once that

7
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cross-sectional area was established it

8
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would if you could keep that same area

9
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all the way through you read it all the

10
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way through the flow of the air around

11
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the around the airplane you cut down the

12
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drag a tremendous amount and that was

13
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really necessary for supersonic flight

14
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and so that was a very big advancement

15
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at that time and and of course that that

16
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principle was used in in all of the