Virgin Atlantic Boeing 787 Dreamliner Hits 801 MPH Over Pennsylvania, Thanks to Jet Stream
Nothing like a little breeze at your airliner's back to make it look like you're going supersonic.
Who needs the Concorde, anyway? On Monday, somewhere over northern Pennsylvania, a Virgin Atlantic-flown Boeing 787 Dreamliner traveling from Los Angeles to London managed to go where few commercial planes have gone before: to a speed of 801 miles per hour.
As The Washington Post brought to light, pilots and aviation nerds were a-twitter about the Boeing's speed last night, taking to journalism's favorite social medium to broadcast their delight at seeing the giant numbers appear.
There is, of course, a catch: that 801-mph Vmax was the plane's ground speed, or the rate at which it was passing over the chilly landscape of PA below. As far as the 787 was concerned, however, it was still well within the performance envelope it was designed for, zipping along close to its established cruising speed of around 560 miles per hour.
How? It's a matter of airspeed versus groundspeed, of course.
Groundspeed, as it sounds like, is how fast a plane appears to be traveling from the vantage point of an observer on the solid, unmoving ground below. If you were the Flash and wanted to keep pace with the 787 above you yesterday, you'd have to be running along at 801 miles per hour to match it. Airspeed, on the other hand, is how fast a plane is traveling compared to the air around it—for example, how fast it might look to a balloon floating along in the same air. In the case of yesterday's speeding Dreamliner, that wind was a jet stream current flowing from west to east at faster-than-normal speeds; as The Washington Post pointed out, a weather balloon lofted from central Long Island's Upton, New York clocked the jet stream yesterday at a record 231 miles per hour. With wind that strong at the aircraft's back, even a 225-ton 787-9 can pick up a nice speed boost—in this case, enough to push it to speeds never before seen for its type, at least from the ground.
So from the perspective of the FAA's ground-based tracking systems, the Virgin Boeing would seem to be going supersonic over the Northeast, while the passengers and crew would have felt as though their plane was cruising along at a nice happy Mach 0.85 or so. Until, that is, they landed at London Heathrow's Terminal 3 at 8:22am local time Tuesday, 48 minutes ahead of schedule.
- RELATEDLearjet And Airbus Had Strange Encounter With Mysterious Craft Over ArizonaThe FAA recording between air traffic controllers and the aircraft involved in the incident is bizarre to say the least.READ NOW
- RELATEDThe Airbus A380, the World's Largest Passenger Plane, Is Being Killed OffThe mammoth two-level, four-engine airliner will end production in 2021.READ NOW
- RELATEDWatch the Boeing 787 Dreamliner Swoop and Soar Like a Fighter JetA very large fighter jet. That can hold up to 420 very airsick people.READ NOW
- RELATEDThe New Boeing 747 Experience"Good Day Atlanta" explores the Boeing 747 Experience.READ NOW
- RELATEDBoeing to Use 3-D Printed Titanium Parts to Cut 787 Dreamliner CostsBoeing hired Norsk Titanium AS to 3-D print structural titanium parts for its newest jumbo jet.READ NOW