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<DIV>Bill,</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV>Don</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=billglaze@triad.rr.com href="mailto:billglaze@triad.rr.com">Bill
Glaze</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, June 06, 2005 8:21 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Track v.s. Heading</DIV>
<DIV><BR></DIV>Don:<BR>Very lucid explanation. Anything I can do to help
try to correct it, I'll do. Just let me know. Bill
Glaze<BR><BR>Don Ramsey wrote:<BR>
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<DIV><FONT size=2>OK, here's my thoughts on heading and track. They
are very different terms. Track is the path of the model over the
ground. Heading is the direction the nose is pointed. With no
wind, heading and track are the same. The downgrades for some
turnaround maneuvers are absolutely incorrect when there is the statement,
"Model heading does not finish exactly opposite direction of entry."
</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Let's take an example:</FONT></DIV>
<DIV><FONT size=2>Say the course parallel to the flight line is north-south
(360 or 180 degrees). Assume the 180 degree heading is from left
to right. With no wind, if the model is flying parallel to the flight
line the heading and track will be 180 degrees from left to right. Now
assume an in blowing wind that requires a 15 degree correction to maintain a
path parallel to the flightline. Remember the track of the model must
be wind corrected to track parallel to the judges. The heading is now
165 degrees but the track is 180 degrees. The model is crabbed into
the wind 15 degrees with the wings level as required by our regs and the
nose is pointed away from the pilot. Now assume you do a half loop as
a turnaround. The opposite heading to 165 degrees is 345
degrees. And that heading points the model into the flightline not
away as would be required for wind correction. How many judges would
award a perfect score if the model was pointed into the flightline when an
opposite correction was required? These mis-stated downgrades in the
regulations have been ignored for years (at least I hope they have).
Substitute track for heading and the model is now required to exit the half
loop on an exact opposite track. In other words, parallel to the
flightline entering the maneuver and parallel to the flightline on
exit.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Don</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV><FONT size=2>PS: On all modern jetliners the NAV display has pointers
for both heading and track and they are seldom the same in the
air.</FONT></DIV>
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