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<DIV><FONT size=2>A 1/2 size model at half distance at the same angle...
will look exactly the same.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If the model is at half distance and same height... then the
angle has changed. If it is at a 60 deg angle when at 170 meters out, it
will be at 30 deg if its 85 meters out but the same altitude.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>There is a difference between distance and angle.
Parallax is ALL about the angles. distance is irrelevant.</FONT></DIV>
<BLOCKQUOTE
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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=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, April 10, 2007 12:03
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] APPARENT
GEOMETRY (PARALLAXED VIEW)</DIV>
<DIV><BR></DIV>
<DIV>Absolute height of maneuvers unchanged, the parallax of 60 inch model at
170 yards is not the same as a 60 inch model at 85 yards.</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From: "Fred Huber" <<A
href="mailto:fhhuber@clearwire.net">fhhuber@clearwire.net</A>> <BR>
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<DIV><FONT size=2>Its basic geometry... similar triangles.</FONT></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=tkeithblack@gmail.com href="mailto:tkeithblack@gmail.com">Keith
Black</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, April 10, 2007 2:31
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
APPARENT GEOMETRY (PARALLAXED VIEW)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Fred, are you suggesting that a 45 degree
angle at the end of the box would appear the same if the plane is five
feet in front of the flight line or 500 feet in front of the flight
line? I don't buy it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith</FONT></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=fhhuber@clearwire.net href="mailto:fhhuber@clearwire.net">Fred
Huber</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, April 09, 2007 11:41
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
APPARENT GEOMETRY (PARALLAXED VIEW)</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>Distance in/out has no effect on parallax. Its
the angle relative to the viewed line.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The judges and pilots will have the same parallax to
deal with if the pilot flys a 30 inch model at 85 yards
away as they will with a 60 inch model at 170 yards. You
might be hard pressed to tell plane which is which on film...
Thats why 1/4 and 1/2 scale models get used for making movies. The
camera can remove perspective clues that indicate distance and
scale.</FONT></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=tkeithblack@gmail.com
href="mailto:tkeithblack@gmail.com">Keith Black</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, April 09, 2007
11:24 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
APPARENT GEOMETRY (PARALLAXED VIEW)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I tend to agree with Ed. Furthermore,
what hard facts could possibly be stated about this in the rule book?
Would you want it to say that when observing end maneuvers the judge
should downgrade if the angle doesn't look steeper than 45 deg.? IMO
this is inappropriate for the rule book, though it's perfectly
acceptable to point out in a judges clinic or judging tips
document.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keep in mind also that the distance in
our out will also change the look of the end 45 deg. angle. This means
that this discussion also would need to be in the rule book. I
think the rule book should just state facts, educating the pilot and
judge on how to recognize geometry so they can enforce the rule book
is important but ancillary to the official rule book.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>My opinion.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith Black</FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=divesplat@yahoo.com href="mailto:divesplat@yahoo.com">Ed
Deaver</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing
List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, April 09, 2007
11:04 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
APPARENT GEOMETRY (PARALLAXED VIEW)</DIV>
<DIV><BR></DIV>
<DIV>Have been thinking about this discussion (currently going on
elsewhere also) and suddenly had the light bulb go on.</DIV>
<DIV> </DIV>
<DIV>At some clubs as we enter the driveway that leads to the field,
1/2 mile away or maybe a bit more, or the NATs site for example from
site 3 (grass field I think) to site 2, it is very easy to watch the
geometry of the plane being flown. At this distance, there is
almost zero vertical parallax due to the distance from the
pilot.</DIV>
<DIV> </DIV>
<DIV>Sooooo, what do we see at this distance. Loops sure do
look round to me when flown by good pilots, 45's look like 45's or
maybe 50's (my contention is a slight bit steeper always scores
better than a slight bit flatter) and even though the pilot is
standing "under" the manuever, the good pilots still keep the
geometry when looked at from a distance, Correct.</DIV>
<DIV> </DIV>
<DIV>At the end of the box, standing this distance away it is easier
to see the geometry again, with only a very little parallax and the
good pilots, IMO still keep the geometry very close to what it
should be. The 45's may be a slight bit steeper, but from a
distance the 1/2 cuban 8 flown well, will still have a round radius,
with very close to a 45 degree downline (again depending on what the
local teacher states), with the rolling element centered.</DIV>
<DIV> </DIV>
<DIV>My point is, too much is being made of this parallax issue and
think judges will reward the pilot that flies the correct geometry,
which again IMO, can be verified by watching a flight from a
distance.</DIV>
<DIV> </DIV>
<DIV>Just my $.02</DIV>
<DIV> </DIV>
<DIV>Ed<BR><BR><B><I>rcmaster199@aol.com</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<DIV>A question has been posted from an IMAC gentleman (who
is trying to write better IMAC rules) as to how Pattern
people fly and judge skewed appearance of maneuvers at box ends or
in center when tall maneuvers (Hourglass, Vert Sq 8, Rolling Ess,
etc) are involved. </DIV>
<DIV> </DIV>
<DIV>Some of us have searched the book and found no wording
written that describes what the pilots' responsibilities and the
judges' responsibilities are in the performance of the skewed
apparent geometry. There is a statement in the Judges Training
tape in regard to end maneuvers.... that these will appear
different even when accurately flown. The oness is essentially on
the judges to know how the True Geometry should appear when flown
at an angle to the eye, and must not downgrade for Apparent or
Parallaxed appearance difference.</DIV>
<DIV> </DIV>
<DIV>Spoke with Don about this earlier today and we decided to
present the question to the group and get some conversation going.
We should be explicit in the book regarding how such Apparent
Geometry should be treated....ie- what is the pilot's
responsibility and what is the judge's. Description improvements
could be written over the next couple rule cycles.</DIV>
<DIV> </DIV>
<DIV>The pilot's responsibility may appear easy.... they simply
need to fly precise geometry per the book. True enough,
BUT.....consider what is actually flown, especially by the top
guys, and what scores well. These are not necessarily as precise
as one might think. The better pilots tend to fly purposely flawed
maneuvers that give the impression of precision. </DIV>
<DIV> </DIV>
<DIV>MattK</DIV>
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