- Awesome - Wanna see a sonic boom?
- Through the viewfinder of his camera, Ensign John Gay could see the
fighter plane drop from the sky heading toward the port side of the aircraft carrier
Constellation. At 1,000 feet, the pilot drops the F/A-18C Hornet to increase his speed to
750 mph, vapor flickering off the curved surfaces of the plane. In the precise moment a
cloud in the shape of a farm-fresh egg forms around the Hornet 200 yards from the carrier,
its engines rippling the Pacific Ocean just 75 feet below, Gay hears an explosion and
snaps his camera shutter once.
- "I clicked the same time I heard the boom, and I knew I had
it", Gay said. What he had was a technically meticulous depiction of the sound
barrier being broken July 7, 1999, somewhere on the Pacific between Hawaii and Japan.
Sports Illustrated, Brills Content, and Life ran the photo.
- The photo recently took first prize in the science and technology
division in the World Press Photo 2000 contest, which drew more than 42,000 entries
- "All of a sudden, in the last few days, I've been getting calls
from everywhere about it again. It's kind of neat," he said, in a telephone interview
from his station in Virginia Beach, VA.
- A naval veteran of 12 years, Gay, 38, manages a crew of eight assigned
to take intelligence photographs from the high-tech belly of an F-14 Tomcat, the fastest
fighter in the U.S. Navy. In July, Gay had been part of a Joint Task Force Exercise as the
Constellation made its way to Japan.
- Gay selected his Nikon 90 S, one of the five 35 mm cameras he owns. He
set his 80-300 mm zoom lens on 300 mm, set his shutter speed at 1/1000 of a second with an
aperture setting of F5.6. "I put it on full manual, focus and exposure," Gay
said. "I tell young photographers who are into automatic everything, you aren't going
to get that shot on auto.
- The plane is too fast. The camera can't keep up."
- At sea level a plane must exceed 741 mph to break the sound barrier, or
the speed at which sound travels. The change in pressure as the plane outruns all of the
pressure and sound waves in front of it is heard on the ground as an explosion or sonic
boom. The pressure change condenses the water in the air as the jet passes these waves.
Altitude, wind speed, humidity, the shape and trajectory of the plane - all of these
affect the breaking of this barrier. The slightest drag or atmospheric pull on the plane
shatters the vapor oval like fireworks as the plane passes through, he said everything on
July 7 was perfect. "You see this vapor flicker around the plane that gets bigger and
bigger. You get this loud boom, and it's instantaneous. The vapor cloud is there, and then
it's not there. It's the coolest thing you have ever seen."
- Now take a look...