ATO #102 - March 31, 2000
QuestChats require pre-registration. Unless otherwise noted, registration is at: http://quest.arc.nasa.gov/aero/chats/ Tuesday, April 4, 2000 10 - 11 AM Pacific Regimes of Flight Aerospace Team Online Chat with Dale Satran Dale Staran is responsible for guiding a team involved in the high lift research program. The team develops new tools for industry to use in designing high lift systems on commercial transports. Read his bio at http://quest.nasa.gov/aero/team/satran.html Thursday, April 19, 2000, 9 - 10 AM Pacific Aerospace Team Online QuestChat with Chris Beins Chris Beins plays an intersting role! His job is to help engineers and scientists work with lawyers and business people to understand ideas, sofware and computer programs are protected and safe from hackers! Read his bio at http://quest.nasa.gov/aero/team/beins.html Tuesday, April 25, 2000 10 - 11 AM Pacific Regimes of Flight Aerospace Team Online Chat with Steve Smith As an aerospace research engineer, Steve Smith spends his time doing experimental research in wind tunnels and applying computer flow simulations to evaluate new ideas for airplanes. Read his bio at http://quest.nasa.gov/aero/team/smith.html
"Regimes of Flight" Consider joining the chats with Dale Satran, April 4 or Steve Smith, April 25. They can answer questions about the New Aircraft Designs!! A New Regime, by Susan Ashby is now online! This is the story of Chuck Yeager's flight that broke the Sound Barrier! It now has movies and interactive vocabulary as well and will soon have an audio version. For more information see http://quest.nasa.gov/aero/events/regimes/new.html - - - - - - - Design a New Aircraft CONTEST!!! Regimes of Flight Design a New Aircraft Contest, Grades 4-8 March 3 - April 14, 2000 Choose one regime of flight: low, medium, high, supersonic, or hypersonic. design an new aircraft for the regime you pick! For more information: go to http://quest.nasa.gov/aero/events/regimes/contest.html#design
[Editor's note: Dale Satran does research on planes like the B777 and a blended wing airplane. Read his bio at http://quest.nasa.gov/aero/team/satran.html ]
THE B777 HIGH LIFT TEST IN THE 12-FOOT PRESSURE WIND TUNNEL
by Dale Satran
February 1998 There were several research goals for this test. The B777 aircraft was already certified and in public use but there were some discrepancies between previous wind tunnel test data and the flight test results. The research goals were to establish a high Reynolds Number database for a full-span model in the 12-Foot Pressure Wind Tunnel, to evaluate stability and control characteristics, and to evaluate a new high lift design. The model mounting system is different in the 12-Foot from the mounting system used in other wind tunnels where the B777 had previously been tested. The 12-Foot mounting system created some wind tunnel entry. In other words, the data could not be compared directly with data from previous wind tunnel tests. The data from the test was useful to the B777 program but only incrementally. A future test was planned to account for the model mounting interference by testing the model upright and inverted. Unfortunately at this time, that test has been canceled due to budget cuts. The incremental data from the test provided Boeing with some new insights into the performance of the B777. A large matrix of different control deflections were documented for different tunnel conditions. Several minor configuration changes were evaluated for future incorporation into the B777 configuration. The advanced high lift design work was unfortunately eliminated due to budget cuts. As a part of this test, we built a semi-span model to be tested in the National Transonic Facility, NTF, which is a cryogenic wind tunnel. The NTF has the capability of testing the B777 model at flight Reynolds Numbers. When the data from that test is available, it will be compared to the full-span data from the 12-Foot and other wind tunnel tests. One of the results will be to determine what Reynolds Number is required to accurately predict the performance of an aircraft.