1997 First Supersonic Flight 50th Anniversary 32 Cent US Postage Stamp Unused Sheet of 20 Scott #3173

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We are pleased to offer for sale this 1997 First Supersonic Flight 50th Anniversary 32 Cent US Postage Stamp Unused Sheet of 20 Scott #3173.

• Country: United States
• Stamp Name: First Supersonic Flight 50th Anniversary
  
• First Day Cover Issue Date: October 14th, 1997
• Denomination: 32 Cents
• Scott Number: 3173 First Supersonic Flight 1947
  
• Illustration Number: A2456 First Supersonic Flight 1947
  
• Color: Multicolored
  
• Condition: Unused. Stamp Sheet is a stock photo. Plate positions may vary.
• Sheet Size: 20 stamps, 4 across 5 down
  
• History: On October 14th, 1947, US Air Force Captain Charles Yeager became the first pilot to break the sound barrier with the Bell X-1 aircraft which Yeager named Glamorous Glennis, in honor of his wife. During the test flight he reached a top speed of 700 miles per hour, traveling faster than the speed of sound.  The rocket powered aircraft did not take off from the ground.  Instead, it was launched from under a Boeing B-29 at an altitude of 43,000 feet.   This was the 50th flight the Bell X-1 had attempted.  Although others claimed to be the first to travel faster than the speed of sound, Yeager's was the first to be able to prove the achievement, as the others did not have accurate instruments to record their speeds.
  

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