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ADTO # 69 - July 9, 1999

PART 1: Upcoming Chats
PART 2: Project News
PART 3: Instrumentation for the High Speed Civil Transport Wind Tunnel
PART 4: Subscribing & unsubscribing: how to do it!


Have you always wanted to chat but not had time to practice or test it

NASA QuestChat project manager, Oran Cox invites you to practice
chatting with him.

He's scheduled practice chats for Tuesday, July 13, 1999
at 10 AM PDT and Thursday, July 15, 1999 at 1 PM PDT. For more information
visit: http://quest.arc.nasa.gov/qchats/

Tuesday, July 20, 11:00 a.m. Pacific Daylight Time:
Jim Barnes, senior system safety engineer

Jim is responsible for  making sure the tests are conducted
safely, without damage to the test vehicles wind tunnels, or anyone in
the test environment. Jim's role ensures data from these tests will be
collected successfully. He has used his skills to offer suggestions
about safety of the Wright Flyer.

Read Jim's profile and prior to joining this chat.

Tuesday, July 27, 9:00 a.m. Pacific Daylight Time:
Phillip Luan, mechanical engineer

Balances used in wind tunnel tests tell engineers how the
force of the wind affects the model. Phillip is responsible for making
sure that balances used for these tests are extremely accurate. He also
helps determine how electrical signals received during the tests are
related to the accuracy of the balances.

Read Phillip's profile and field journals prior to joining this chat.



Summer Air Travel Contest

This a special summer contest for Aerospace Team Online. This contest is
open to all students between the grades of fourth through twelfth. The
grade categories are as follows:

      4th through 8th
      9th through 12th

For this contest, we ask students to help researchers here at NASA solve
the air travel traffic problems. For more information go to

- - - - - - -
Lecture Series to be Webcast

The 1999 NASA-ASEE-Stanford Summer Faculty Program seminars on "Current
Research in the Aerospace Sciences" will be webcast on the Learning
Technologies Channel. For more information at times visit the LTC Schedule
page. http://quest.arc.nasa.gov/ltc/schedule.html

Lectures focused on Aeronautics include:
July 13 - DR. JOHN ZUK, Research Scientist, Manager  - Advanced
Tiltrotor Transport Technology Office, NASA Ames Research Center,
"Advanced Tiltrotor Technology"

July 20 - DR. PAUL KUTLER, Deputy Director, Information Sciences and
Technology , NASA Ames Research Center, "An Overview of the Information
Science and Technology Directorate will be presented."

July 27 - DR. DAVID KORSMEYER, Senior Project Scientist, Computational
Sciences Division, NASA Ames Research Center, "NASA's Distributed
Aerospace Data Management"

[Editor's Note:Robert Jercinovich is an instrument technolgist in the
twelve foot pressure wind tunnel. Read his biography at
http://quest.arc.nasa.gov/aero/team/jercinovich.html ]


by Robert Jercinovich

July 9, 1999

We have been assembling the instrumentation for this test to measure lift
and drag during the test. We have also been installing the
instrumentation that will measure the air pressure on the wings. Which
instruments we need, and how they would fit inside the model, was all
planned out over the last couple of weeks.

The balance is the instrument which measures lift and drag, forces acting
on the model when the wind blows on it are measured by strain gages in
the balance. Simulating the forces that act on planes when they fly. The
balance was calibrated at Langley, then checked at Ames calibration lab
and then transferred to the tunnel data system. To calibrate the
balance you have to hold on to one end of the balance, hang some "known"
weight on the other end, and measure the output voltage.

The balance has been attached to the model and a new bayonet pitch block
were installed. The test manager and the computer programmer
were checkloading the balance. This took quite a while because we had
some problems with the way the balance calibration was transferred from
Langley to the 12 foot data system (SDS). In addition, we had some noise
(EMF) from the bi-pod motors ,which control the angle of attack of the
model, to reduce.  When we say noise we mean the electromagnetic
interference which affects the quality of the data recorded during the
wind tunnel test.

We've been hooking up all the stainless lines which run from tiny holes
on the surface of the model to polyurethane tubes which are then connected
to the PSI modules which have already been installed. This activity took
two technicians two days to complete because there are hundreds of them.

Two instrumentation technicians and 2 mechanics have been working to put
the model together. It traveled to Ames in pieces. Next week we are going
to be hooking up the tilt sensors, the rest of the psi sensors, and the
strain gauges in the wing. Then we will start trying to test things out in
the data system. However we don't have the complete computer program we
need yet to collect the data we want from the test.  It will be
unavailable until we move into the test section.



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