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Mustang Air to Air: The Sequel
  
 
JWilsonphoto
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p.3540 #1 · p.3540 #1 · Mustang Air to Air: The Sequel


Hey guys, can someone explain that Great Circle Route thing to me. I looked at the course for the A380 and it sure seems like it would be shorter to head straight across. I'm sure I'm missing something, what's the deal?


Feb 03, 2013 at 08:05 PM
ELinder
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p.3540 #2 · p.3540 #2 · Mustang Air to Air: The Sequel


It's the difference between drawing a straight line on a map verses actually flying over a globe. The great circle route is the shortest distance between 2 points on the surface of the sphere.

Erich



Feb 03, 2013 at 08:11 PM
astrobrian
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p.3540 #3 · p.3540 #3 · Mustang Air to Air: The Sequel


JWilsonphoto wrote:
Hey guys, can someone explain that Great Circle Route thing to me. I looked at the course for the A380 and it sure seems like it would be shorter to head straight across. I'm sure I'm missing something, what's the deal?

Was going to say maybe something to do with earths movements as the orbit of a spacecraft is a ton of S turns on a map








Feb 03, 2013 at 10:07 PM
astrobrian
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p.3540 #4 · p.3540 #4 · Mustang Air to Air: The Sequel


Got one of the Seals / Catfish / Piaggio planes today at GTU.







Feb 03, 2013 at 10:09 PM
cbrandt
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p.3540 #5 · p.3540 #5 · Mustang Air to Air: The Sequel


Amazin' photos just poppin' off the screen .. Congrats to everybody !!

Pretty lousy weather this weekend, but we had a Challanger and a Global Express come in to Easton last night .. I didn't get to see the Global as they put it in the MD Air hangar .. maybel I'll get lucky to shoot it tomorrow if it leaves around noon with this Novato, Ca unit

Challanger






Feb 03, 2013 at 10:56 PM
Lotuselite
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p.3540 #6 · p.3540 #6 · Mustang Air to Air: The Sequel


Re Great Circle routes,
This site will show you great circle routes between points.
http://gc.kls2.com/

Actually flying an exact great circle route is not always the norm due to winds, airway structures, eg North Atlantic, North Pacific tracks, variable overflight costs and so on.
What you really want is Minimum Time Track, (MTT) for cost purposes but even that is not always possible. It usually boils down to cost.



Feb 03, 2013 at 11:51 PM
dtw757
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p.3540 #7 · p.3540 #7 · Mustang Air to Air: The Sequel


JWilsonphoto wrote:
Hey guys, can someone explain that Great Circle Route thing to me. I looked at the course for the A380 and it sure seems like it would be shorter to head straight across. I'm sure I'm missing something, what's the deal?



If you drew a straight line on a flat chart or map, took the course ateach place where they crossed a line of longitude, you would come up with a series of constantly changing headings. That is what the flight aware "course" or route of flight reflects. Take the place where the aircraft crosses each 10 degrees of longitude on a flat chart, plot those points on a globe and you will see that it is actually a straight line. This aircraft shows a course initially headed north and eventually finishes south but in truth IS flying a straight line between the 2 points due to the curvature of the earth...or Great Circle. If you took that flat chart and drew a straight line and placed the points on a globe, the route would actually have a south to north track and also be longer in distance.

Mike



Feb 03, 2013 at 11:59 PM
Tim Adams
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p.3540 #8 · p.3540 #8 · Mustang Air to Air: The Sequel


Busy today. Petit Le Mans is up.






http://www.timadamsphotography.com/tim_adams_motorsports_and_avia227.htm

And the worst light of the year award for me, the 2012 Quad Cities Airshow.





http://www.timadamsphotography.com/tim_adams_motorsports_and_avia226.htm



Feb 04, 2013 at 01:30 AM
JWilsonphoto
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p.3540 #9 · p.3540 #9 · Mustang Air to Air: The Sequel


I hate even hearing the name of that event.


Feb 04, 2013 at 01:48 AM
stevezzzz
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p.3540 #10 · p.3540 #10 · Mustang Air to Air: The Sequel


dtw757 wrote:
If you drew a straight line on a flat chart or map, took the course ateach place where they crossed a line of longitude, you would come up with a series of constantly changing headings. That is what the flight aware "course" or route of flight reflects. Take the place where the aircraft crosses each 10 degrees of longitude on a flat chart, plot those points on a globe and you will see that it is actually a straight line. This aircraft shows a course initially headed north and eventually finishes south but in truth IS flying a straight line
...Show more

Aviation sectional charts employ a Lambert Conformal Conical Projection. According to the Wikipedia article, "Pilots favor these charts because a straight line drawn on a Lambert conformal conic projection approximates a great-circle route between endpoints as long as distances are not great." Which is what Mike is getting at, I'm guessing.

http://en.wikipedia.org/wiki/Lambert_conformal_conic_projection

But over shorter distances, a great circle route is negligibly shorter than a route flown at a constant heading. Over longer distances and especially for roughly east-west routes between points at at higher latitudes, I don't know of any flat map projection that allows you to draw a straight line to plot a great circle, at least not in the general case.

As for that plot of the ground track of an orbiting satellite: that's a whole 'nother discussion having to do with the fact that the Earth rotates underneath an object in orbit. If the satellite is placed into an orbit inclined w/r/t to the Equator, the ground track depicted on a Mercator projection looks like a sine wave.



Feb 04, 2013 at 01:57 AM
 

Search in Used Dept. 



cbrandt
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p.3540 #11 · p.3540 #11 · Mustang Air to Air: The Sequel


narasimhalu wrote:
AH-64 Apache - Houston Air Show

http://narasimhalu.smugmug.com/Machines/Incredible-Machines/i-bwDFtMw/1/X2/Apache%20Helicopter-X2.jpg



Very nice .. along with your access and automobile work too ........



Feb 04, 2013 at 02:37 AM
dtw757
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p.3540 #12 · p.3540 #12 · Mustang Air to Air: The Sequel


You understand correctly Steve re Lambert Conformal, key words "as long as the distances are not great".....when I'm plotting our route from SEA to Narita, (long routes) the "course" on the chart goes north up to the Pacific "tracks and follow the Aleutians , down the Kamchatka Peninsula and into Japanese airspace. Same principal going East to Europe. There isn't an aviation chart that we use that will show it as a straight line. We used to put ones up for the passengers in the old days before those moving map displays everyone has at their seat.

Mike



Feb 04, 2013 at 02:41 AM
Razor17
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p.3540 #13 · p.3540 #13 · Mustang Air to Air: The Sequel


astrobrian wrote:
Got one of the Seals / Catfish / Piaggio planes today at GTU.



Did you see Robert and his Mustang Buzzin Cussin today? He was headed to the airport to fly...


Edited on Feb 04, 2013 at 05:01 AM · View previous versions



Feb 04, 2013 at 04:25 AM
went
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p.3540 #14 · p.3540 #14 · Mustang Air to Air: The Sequel


Jetman,Yves Rossy, ex Swiss Airforce, ex Swiss Air 747 Captain, designer & test pilot of the 2.4m 26Kg carbon fibre wing, also carries 22litres of jet fuel, recently at North Shore Aero Club, flew the first day solo 2nd day in formation with 2 club plans & on the 3rd day in formation with 5 club planes. He lets go the Helio at 4,000 ft glides then fires the jets pulsing them at about every 200m cruising at 200kph. and has so much control just by twisting his body lightly to the left to go left and right to go right arches his back to gain elevation & bending his back to turn down. He has a break chute to scrub speed & then the main chute to control his landing. The pictures tell the story. He is 53 years young !!

Went



went 2012


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Edited on Feb 04, 2013 at 05:02 AM · View previous versions



Feb 04, 2013 at 04:46 AM
went
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p.3540 #15 · p.3540 #15 · Mustang Air to Air: The Sequel


continuation



went 2012


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went 2012


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Feb 04, 2013 at 04:49 AM
went
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p.3540 #16 · p.3540 #16 · Mustang Air to Air: The Sequel


continuation



went 2012


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went 2012


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went 2012


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went 2012


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went 2012


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Feb 04, 2013 at 04:52 AM
went
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p.3540 #17 · p.3540 #17 · Mustang Air to Air: The Sequel


Final continuation



went 2012


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went 2012


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went 2012


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Feb 04, 2013 at 04:55 AM
Glenn Watson
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p.3540 #18 · p.3540 #18 · Mustang Air to Air: The Sequel


Razor17 wrote:
Did you see Robert and his Mustang Buzzin Cussin today? He was headed to the airport to fly...



I did - was behind him in the Sukhoi in the run up area. Funny, we were at the fuel pumps getting gas when he taxied by to depart and we were back at the fuel pumps when he taxied back to his hangar!

Great day for flying - experienced my first accidental half snap-roll caused by botching a spin recovery. that will wake you up!

Glenn




Feb 04, 2013 at 05:24 AM
stevezzzz
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p.3540 #19 · p.3540 #19 · Mustang Air to Air: The Sequel


Glenn Watson wrote:
I did - was behind him in the Sukhoi in the run up area. Funny, we were at the fuel pumps getting gas when he taxied by to depart and we were back at the fuel pumps when he taxied back to his hangar!

Great day for flying - experienced my first accidental half snap-roll caused by botching a spin recovery. that will wake you up!

Glenn



Inadvertent snap rolls are definitely an eye opener, Glenn. Look at it this way: you got two recoveries for the price of one!

Went, I tip my hat to Yves Rossy, and thanks for sharing your photos.



Feb 04, 2013 at 05:34 AM
JWilsonphoto
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p.3540 #20 · p.3540 #20 · Mustang Air to Air: The Sequel


Great shots Went!


Feb 04, 2013 at 06:04 AM
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