August 30, 2010
By Thomas A. Horne
Gulfstream Aerospace’s new G650 reached Mach 0.995 in flutter tests, a feat that prompts the company to dub its top-of-the-line airplane the world’s fastest civil aircraft. The speed was attained as part of the G650’s certification flight test program.
Gulfstream experimental test pilots Tom Horne and Gary Freeman, along with flight test engineer Bill Osborne, pitched the airplane’s nose down 16 to 18 degrees below the horizon to hit the target speed. The maneuver was designed to test the airplane’s natural flutter resistance when the wings, tail, and control surfaces were subjected to vibrations from onboard flutter exciters. The vibration frequencies exerted on the airplane ranged from two hertz (cycles per second) to 58 hertz, or about as fast as a fluorescent light flickers.
The airplane performed as expected. Horne said, “The airplane is very predictable. It’s very easy to control and get precise control at those speeds. The airplane response has matched the expectations of our engineers, and we’ve been able to easily fly the test conditions and march through the test plan.”
The four airplanes participating in the G650 flight test program—which began on Nov. 25, 2009—have completed more than 170 flights and 575 flight-test hours.
AOPA Pilot Editor at Large Tom Horne has worked at AOPA since the early 1980s. He began flying in 1975 and has an airline transport pilot and flight instructor certificates. He’s flown everything from ultralights to Gulfstreams and ferried numerous piston airplanes across the Atlantic.
As the cold weather chills AOPA’s Headquarters in Frederick, many of us are inside generating new resources for flying clubs.
In my house, every Friday night is “Movie Night.” While the movies are rarely educational (I don’t think I learned anything from the Lego Movie), we look forward to the weekly opportunity to spend time together. Why not use the same concept for your Flying Club (with the addition of education, of course)?
AOPA Flying Club Manager Kelby Ferwerda posted the following on the AOPA Flying Club Facebook Page: “Recently I’ve talked with quite a few Flying Clubs about maintaining social activity through the cold winter months. Some clubs host Holliday Parties, others have Potluck Movie Nights. What does your club do to keep members involved during the chilly months?”
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