DFW SAWTOOTH5 departure

jeez if that wasnt in texas id think that i had flown it :)
 
Check out the name of his destination...
 
Weaving in and out of really small storm cells, yeah that's it.
 
Kind of looks like taxing a tail dragger. Maybe he couldn't see over the cowl?
 
looks like a typical IR training flight to me.:D
 
If you look at the track log, the longitude rate of change was pretty consistent. The latitude long had strings of repeated values. I'm thinking that there was a position rounding error or reporting error in the system. How often and how perfect do you have to fly perfectly east/west north/south true (not magnetic) in a perfectly straight line?

--Carlos V.
 
TangoWhiskey said:
Hmmm. Could be, but flying at a constant cruise speed, wouldn't the longitudinal rate of change be pretty consistent? :rolleyes:
Click to expand...

I could be flying circles. Then the rate of change wouldn't be.

I mean with my original post that one dataset is smooth, one is repetitive. Which one is suspect?

Here's the track log:

02:16PM 33.07 -97.50 71 6000
02:17PM 33.07 -97.53 85 6000
02:18PM 33.07 -97.57 85 6000
02:19PM 33.05 -97.60 85 6000
02:20PM 33.05 -97.63 85 6000
02:21PM 33.05 -97.65 85 6000
02:22PM 33.05 -97.68 90 6000
02:23PM 33.03 -97.72 90 6000
02:24PM 33.03 -97.75 90 6000
02:25PM 33.03 -97.78 90 6000
02:26PM 33.02 -97.80 90 6000
02:27PM 33.02 -97.83 90 6000
02:28PM 33.02 -97.87 90 6000
02:29PM 33.02 -97.90 90 6000



Note the 3-4 pattern on the second column. It's a rounding error, IMO.

--Carlos V.
 
Last edited:
7500

Possum Kingdom was my first destination as a licensed pilot.

/7500
 
It looks like a resolution error. The reporting grid is 0.01" so lets see...

He's going 0.03 degrees longitude per minute.

1 nm/degree minute longitude at the equator, so .03 degrees is 1.8 degree minutes, which is 1.8 miles at the equator. But he's at 33 degrees latitude, so 1.8 nm * cos(33) is roughly 1.5 nm. 1.5nm/minute is 90 knots, so that is roughly matches his groundspeed.

We're seeing computer graphics "Jaggies". There's not enough resolution at 0.01 degrees to plot a straight line for nearly east/west or north/south tracks.

--Carlos "Yes, I'm a geek" V.
 
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