SCAT Electronic News 18 March 1999
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SCAT Electronic News 18 March 1999
Table of Contents
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NFFS Publications
Timing out of sight models can be done - or fast it it flying
timing a "lost model"
Correspondence
NFFS Publications
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Re: Back issues of the Symposium. NFFS has back issues of the Symposium and
they are available from the new Publications Director: Bob McLinden. His
address and the complete list of available publications are presented in the
recent issue of the NFFS Digest.You can also get the list from him at:
3903 W. Temple Place, Denver, CO 80236.
His email address is:
Symposia no longer available via this source will be made available on the
NFFS website as the time permits to scan them into an electronic format.
Bob Stalick, NFFS President
Timing out of sight models can be done
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Reading Bill Fee's piece on determining the time on models after they are
out of sight, and Roger's work on the subject, I thought that if we
could measure airspeed, we would know when it was not flying when
the speed went to zero. I remembered an article by Jim Horton in the
Zaic Handbooks. I found the article in the 1964-65 issue and it
appears on page 118.
Jim devised a system to move a recording pen on a disk attached to a
mechanical timer. There is a half-round disk attached to the arm to
provide drag causing the arm to move relative to airspeed.
The entire flight on a towline glider was recorded. It shows
launch speed (18mph), oscillatins about the glide speed over a
30 second period, steady flight speed (10 mph), a thermal encounter,
and DT when the speed settled quickly to 5 mph.
[Roger
The drawing is excellent, but the text is mostly small Lower case letters
are about 0.8 mm high. If it is worth showing on the web site, the
drawing should be enlarged. The entire drawing is 3.75 by 4.5 in.]
Bill Bogart
timing a "lost model"
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My Bauer Airtech retrieval system has an airborn range vastly in excess of
the timer's ability to see the model and my reciever reliably tells me when
the model has DT'd down because the range drops drastically, I can no longer
hear the signal untill I walk down wind, usually a very long way before I
pick up the signal again.
I routinely point the antenna into the empty sky and when the signal stops
I know the model is down, even if into a tree, that tree will still be far
enough away not to send a signal back as far as the timer/launch point. The
signal changes at various points in the glide circle, and is noticably
different after the model has DT'd but before it has landed. Would that be
a way of timing a "lost" model, or would we be losing the point of the whole
thing?
Jim Brooks
MAAC 1813
Correspondence
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Electronic news
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Roger,
Just an overdue note to thank you for the SCAT Electronic News. Its what
keeps me in touch with all the SCAT guys and doings. Frankly, I don't
know how you do it. Two or three times a week, even. Incredible! Either
you love to do it or it rules you.
Best, Craig Cusick
[Craig, I like doing it, I think it is important and it takes too
much time !. But it's not really what I write, its what all the readers
contribute that is important. ]
......................................
Roger Morrell
