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When I showed up at the Able Corp. warehouse I found
many of the team members at work already. They worked most of the
morning getting the motor and chain drives ready. Would the propellers
spin freely or would the chain bind up in a mechanism whose design
was just too old? The Wright brothers were known for using sound engineering
principles and everybody there was betting that it would work fine.
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| Jack Cherne, the AIAA Project Chairman, watches the
electric motor intently as it runs for more than an hour. The "pistol"
in his hands is either an infrared sensor, used to measure the temperature
of the propeller shaft bearings, or a strobe, which is used to measure
the revolutions per minute (RPM) of the shafts. |
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Another view of the crew intently watching the temperature
level on the motor and shaft bearings. |
| Ed Marin is holding the Strobe pistol in this photo.
Notice that my camera's shutter speed was very fast. How do you tell?
In this photo the propeller is visible, although somewhat blurred.
Had I been able to use an even faster shutter speed, the propeller
would have appeared stopped. |
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That propeller is doing about 700 RPM or almost 12
passes every second. No wonder it's blurry. |
| With Walt Watson looking on, we're nearing the end
of the one-hour test. Everyone is still keeping an eye on the temperatures
and RPM, although they're a bit more relaxed now. This picture was
taken with a slower shutter speed, the propeller is nearly invisible. |
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Bob Sechrist and Ed Marin are tweaking the electric
motor controls a bit while Jack Cherne takes a temperature measurement
of the drive chain. |
| No, Jack isn't alone in this photo. It's just that
the Wright Flyer has so many pieces, it managed to block out just
about everyone standing near it. The dark lighting and their dark
blue coveralls don't help the lighting situation either. |
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I climbed on top of a ladder nearby to get a picture
from the top. The manufacturer that made the fabric covering the wings
on this replica was the original manufacturer for the Wright Flyer
and they used the same specifications that they used for the original
Wright Flyer. The chain drive is also made from original castings. |
The power test ran quite well. The motor ran smoothly and
the chain drive performed flawlessly once a couple of kinks were worked
out. The next test will need to be a similar run once it gets to Ames
and gets re-assembled. We'll also need to keep our eyes open to see how
the system works once we get the model mounted to the test sting that
will go into the tunnel. On the sting the model will have more freedom
to bend and flex than it did while sitting solidly on the floor.
