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Guest JoeMathews

Twin Decent Forecast Arcs?

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Hi,I see on this picture there seem to be two decent forcast arcs on the Captain's ND. Is it just something to do with the picture (maybe a slow shutter speed because it's dark) or is it actually there? You can just see a bit of the FO's ND and I can't see the corner of a second arc. What do you think/know?http://www.airliners.net/open.file/1214064/L RegardsJoe Mathews

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Well, I am not an expert photographer, but, don't you think that if it had to do with the shutter speed, then a broad green band should had appeared on the ND screen reflecting the different and multiple positions of the green arc moving during the exposure time ?Jose Luis.

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>Well, I am not an expert photographer, but, don't you think>that if it had to do with the shutter speed, then a broad>green band should had appeared on the ND screen reflecting the>different and multiple positions of the green arc moving>during the exposure time ?I'm inclined to agree. Even if it was a quick movement, you would still see a faint band between. But why would you need two arcs? Ryan GamurotLucky to live Hawai'ihttp://www.virtualpilots.org/signatures/vpa296.png

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If you will look closely at the first officer's display on the right, you can barely make out a single arc and not the other one that shows up on the left display. It looks like a very long exposure was taken since there is a lot of movement blurries with the crew.I bet that these displays are LCD's and that this was an artifact that occurred when the display redrew during the exposure time. Just a guess.Kim

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We don't know how the computer draws the arcs onto the screen - it may have done a recalculation and the arc may have simply have been "moved" without a smooth transition? But that still wouldn't explain why there was two. I am rambling.

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Actually, not necessarily, depending on the length of the exposure. If the movement was relatively smooth and fast (which it usually is), but settled at those two spots for a period of time, that would explain why no "band" is visible.Daniel P.http://www.precisionmanuals.com/images/forum/supporter.jpgMember of SJU Photography. [A HREF=http://www.jetphotos.net/showphotos.php?userid=9004]Click Here[/A] to view my aircraft photos at JetPhotos.Net!The official psychotic AA painter. :)

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That MAY be the OFFPATH DESCENT circle being displayed. PMDG has not implemented it, but it exists in the 744, where the FMC will show you a clean descent circle, and one with spoilers extended.Paul

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If that's true, wouldn't you see it displayed on the first officer's ND screen as well? Just enough of his display is showing that you should be able to see the second arc there.Kim

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