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Originally posted by spcengineer
Nick, physics is physics. If nm/hr (knots) varies in the horizontal, then long/hr should vary. If nm/hr is variable and long/hr is not, then that does not take a rocket scientist to know that there is a problem.
I'm beginning to suspect you are making this more complicated than it is.
Originally posted by spcengineer
Nick, physics is physics. If nm/hr (knots) varies in the horizontal, then long/hr should vary.
Originally posted by darkbluesky
Originally posted by spcengineer
Nick, physics is physics. If nm/hr (knots) varies in the horizontal, then long/hr should vary.
Not necessarily. If an aircraft is flying due west at 200 kts lets say, this equals a long/hr rate of about 3 degrees. This is just a rough guess.
Now if the aircraft turns to a heading of, say....315, and maintains an airspeed of 200 kts, the long/hr rate will decrease proportionately to the variance of the new course from the original course.
Head winds and tail winds will also create discrepancies between indicated airspeed and long/hr rate which is an expression of ground speed along any line of lattitude.
Originally posted by spcengineer
Guys you can't say I did not try. I can't teach you guys first year college physics and statistics in a forum. Pointed out looooooong ago, we are talking about velocity components. Speen and heading form a vector. Vectors have components. We are working with components here.
These are simple concepts, so I my guess is you guys are just playing games and wasting my time. Good luck with your "investigation".
Originally posted by spcengineer
Guys you can't say I did not try. I can't teach you guys first year college physics and statistics in a forum. Pointed out looooooong ago, we are talking about velocity components. Speen and heading form a vector. Vectors have components. We are working with components here.
These are simple concepts, so I my guess is you guys are just playing games and wasting my time. Good luck with your "investigation".
Guys you can't say I did not try. I can't teach you guys first year college physics and statistics in a forum. Pointed out looooooong ago, we are talking about velocity components. Speen and heading form a vector. Vectors have components. We are working with components here.
These are simple concepts, so I my guess is you guys are just playing games and wasting my time. Good luck with your "investigation".
The csv simply by the beginning and ending coordinates (latitude and longitude) being erroneous indicates a problem. My analysis simply compared physics data with instrument data to see if they matched. There were areas they did not, and in the case of the longitude data, significant deviations were noted.
Nick, physics is physics. If nm/hr (knots) varies in the horizontal, then long/hr should vary. If nm/hr is variable and long/hr is not, then that does not take a rocket scientist to know that there is a problem.
In the case of the NTSB data, it is clearly unreliable data for my purposes. Here is why.
1. The FDR csv file has the plane taking off from a field west of Dulles and crashing somewhere well west of the Pentagon (look at the coordinates stupid). The longitude data exhibits a non-normal distribution and appears “fitted”. So for what should be obvious reasons, there is a problem with that data.
38.86
-77.08
Originally posted by mirageofdeceit
I've had a look at the video again and can't see anything that jumps out regarding heading vs. the animation itself.
I used the gridlines within the video as a reference, even going to great lengths to see the aspect of the satellite imagery at the start of the video, but I can't see anything immediately wrong with it. The video appears to be internally consistent.
What did I miss?
[edit on 11-6-2007 by mirageofdeceit]
Originally posted by mirageofdeceit
The final co-ordinates I have are:
38.86
-77.08
That is as close as it gets. I'm surprised this data isn't higher resolution.
I've had a look at the video again and can't see anything that jumps out regarding heading vs. the animation itself. I used the gridlines within the video as a reference, even going to great lengths to see the aspect of the satellite imagery at the start of the video, but I can't see anything immediately wrong with it. The video appears to be internally consistent.
What did I miss?
Originally posted by Caustic Logic
Dial mag heading of 70 mag, visual heading that becomes 90 mag; 20 degrees off.
Originally posted by Caustic Logic
Pretty sure - my map is from Google maps, geo north - 70 mag/60 real maps out w/official path, and 80 real/90 mag is what the flight path shows.
I sure hope that' right 'cause I've hung my hat on it...
Originally posted by nick7261
I would saythat the visual flight path matches up to less than 90 degrees magnetic on the lower map, which has true north vertical. I didn't put a line on it where I thought the flight path was because I didn't want to influence where you think it is. Want to draw a line on the lower map so we can have a confirmed visual flight path for discussion purposes?
Originally posted by Caustic Logic
Here's the original graphic with the Google earth map I used. The path I just drew in by what the animation showed, so it may be off by like a few degrees. It's 80 real, and so about 90 mag, and oriented North as the lower picture above. Correct?
I just completed a slightly more indepth comparative study of the UA93 and AA77 data. It might help Nick in understanding the discussion of velocity components from earlier in the topic.