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Looking at the trajectories in the diagrams they have online, seems off to me.
I remember the plane coming in more directly at the side of the building than at an angle.
Riskus came very close to the plane and it passed the road at an angle almost perpendicular to the direction of travel of the car which he was driving.
All calculated values should be considered as approximate. Consult your aircraft manual for specific values for YOUR aircraft.
All columns in the first story had square cross sections and spirally reinforced cores with a concrete cover of 1 1/2 in.,The story height was 14 ft 1 in.
Originally Posted by WilliamSeger.
I know you guys have discussed the AA77 FDR data here, so I thought this would be the best place to ask: The NTSB animation shows a magnetic heading of 070 just before hitting the Pentagon. Corrected by -10.5 degrees, that would be a true heading of 59.5. On the Democratic Underground September 11 forum, I posted a graphic of that heading (the same one that my friend Roger Harris has already posted here) showing how that heading would be over the bridge where the lamp posts were knocked down. (The point of the post was that Pilotsfor911truth still has the video up even after knowing that it showed an incorrect compass orientation.) JohnDoeX showed up, and among other things claimed that the FDR data from AA77 shows the plane was on a true course of 061.5, presumably because of wind. That's not much of a difference - and that course would still be over the bridge! - but is there any way to tell from the FDR data what the true course was?
Hi William. To answer your last question - I'm not sure but I dont think so. You'd have to look at a wind correction chart for the true track. AFAIK, the FDR doesnt record track, only heading.
Navigation jargon can be quite confusing, but what I think JDX is possibly referring to is "track", not course. The FDR would certainly record the course selector position, but that has no bearing (pun not intended) on the direction of flight. These three terms are sometimes interchanged but they mean completely differenet things:
Heading - Direction the nose is pointing
Course - Desired track along the ground
Track - Actual path along the ground
2.5 degrees of wind drift does seem a bit much for 465 kts against 10-12 kts of wind.
ETA: 2.5 degrees is too much. By plugging in wind direction, speed, airspeed and heading into this calculator - I got 1.0 degrees of wind correction angle. I used 330 degrees and 10 kts for the wind and I'm basing that on this weather report for National Airport at 0951 on 9/11/01. I used 465 kts for grounspeed and 70 degrees for the heading.
Originally posted by ProudBird
reply to post by LaBTop
.....I am convinced that an airplane smashed head-on into the huge concrete second floor slab above the ground floor at the west wall of the Pentagon.
Whew. (Wiping brow).
At a near 90° angle.
Oh? Then this is complete rubbish? All of the people involved lied, and continue to lie? Little bit difficult to reconcile, wouldn't you think?:
THE PENTAGON BUILDING PERFORMANCE REPORT
(Graphics of note, pp 36, 37, 38 and 39)
5. BPS SITE INSPECTIONS
Members of the BPS team inspected the site on two occasions. Between September 14 and September 21, 2001, team leader Paul Mlakar had limited access to the site while rescue and recovery operations were still in progress. On this early inspection visit, he examined the exterior of the building and portions of the building interior.
Controlled access to the site was granted to the full team after rescue and recovery operations were complete. On October 4, 2001, the Pentagon team, together with John Durrant, the executive director of ASCE’s institutes, and W. Gene Corley, the BPS team leader at the World Trade Center, inspected the interior and exterior of the damaged area of the Pentagon for approximately FOUR hours.
The inspection of the BPS team focused on obvious physical damage, primarily in the region of the impact.This inspection was not comprehensive. It did not address fire damage to concrete as a material, and it did not result in full documentation of all physical damage or as-built construction.
By the time the full Pentagon BPS team visited the site, all debris from the aircraft and structural collapse had been removed (figure 5.1) and shoring was in place wherever there was severe structural damage. The design team charged with reconstructing the Pentagon was assessing the building and preparations were being made to demolish the areas for reconstruction. Consequently, the Pentagon BPS team never had direct access to the structural debris as it existed immediately after the aircraft impact and subsequent fire.
Google Video Link |
The teams attempted to inspect and photograph all columns with significant visible damage and most of the beams and floor bays with significant visible damage.To the extent possible, it was noted whether physical loads or the effects of fire caused the observed damage. The BPS team also noted the performance of windows and exterior wall reinforcements that had been installed to enhance blast resistance in Wedge 1 prior to the attack. However the BPS team inspections were not comprehensive, and they did not address fire-related material degradation.
Since all debris was removed prior to the detailed inspection, the team was unable to determine specifically the level and extent of impact damage in this region of the building.
6.1 IMPACT DAMAGE
The site data indicate that the aircraft fuselage impacted the building at column line 14 at an angle of approximately 42 degrees to the normal to the face of the building, at or slightly below the second-story slab. Eyewitness accounts and photographs taken by a security camera suggest that the aircraft was flying on nearly a level path essentially at grade level for several hundred feet immediately prior to impact.
Gashes in the facade above the second-floor slab between column lines 18 and 20 to the south of the collapse area suggest that the aircraft had rolled slightly to the left as it entered the building.
The right wing was below the second-floor slab at the fuselage but above the second-floor slab at the tip, and the left wing struck the building entirely below the second-floor slab, to the north of column line 14.
The width of the severe damage to the west facade of the Pentagon was approximately 120 ft (from column lines 8 to 20). The projected width, perpendicular to the path of the aircraft, was approximately 90 ft, which is substantially less than the 125 ft wingspan of the aircraft (figure 6.1).
An examination of the area encompassed by extending the line of travel of the aircraft to the face of the building shows that there are no discrete marks on the building corresponding to the positions of the outer third of the right wing. The size and position of the actual opening in the facade of the building (from column line 8 to column line 18) indicate that no portion of the outer two-thirds of the right wing and no portion of the outer one-third of the left wing actually entered the building.
It is possible that less of the right wing than the left wing entered the building because the right wing struck the facade crossing the level of the second-floor slab.The strength of the second-floor slab in its own plane would have severed the right wing approximately at the location of the right engine. The left wing did not encounter a slab, so it penetrated more easily.
In any event, the evidence suggests that the tips of both wings did not make direct contact with the facade of the building and that portions of the wings might have been separated from the fuselage before the aircraft struck the building. This is consistent with eyewitness statements that the right wing struck a large generator before the aircraft struck the building and that the left engine struck a ground-level, external vent structure. It is possible that these impacts, which occurred not more than 100 ft before the nose of the aircraft struck the building, may have damaged the wings and caused debris to strike the Pentagon facade and the heliport control building.
The wing fuel tanks are located primarily within the inner half of the wings.The center of gravity of these tanks is approximately one-third of the wing length from the fuselage. Considering this tank position and the physical evidence of the length of each wing that could not have entered the building, it appears likely that not more than half of the fuel in the right wing could have entered the building. While the full volume of the left wing tank was within the portion of the wing that might have entered the building, some of the fuel from all tanks rebounded upon impact and contributed to the fireball. Only a portion of the fuel from the left and right wing tanks and the center fuselage tank actually entered the building.
The height of the damage to the facade of the building was much less than the height of the aircraft’s tail. At approximately 45 ft, the tail height was nearly as tall as the first four floors of the building. Obvious visible damage extended only over the lowest two floors, to approximately 25 ft above grade.
Damage to the first-floor columns is summarized in figures 6.2 and 6.3. In formulating opinions about columns in the collapse area, the BPS team interpreted photographs taken after impact and before collapse.
More likely, the fuselage was destroyed much earlier in its movement through the building. Therefore, the aircraft frame most certainly was destroyed before it had traveled a distance that approximately equaled the length of the aircraft.
The debris that traveled the farthest, traveled approximately twice the length of the aircraft, after entering the building. To come to rest at a point 310 ft (figure 6.6) from the area of impact at a speed of 780 ft/s, that debris experienced an average deceleration of approximately 30 g.
All columns in the first story had square cross sections and spirally reinforced cores with a concrete cover of 1 1/2 in.,The story height was 14 ft 1 in.
Originally posted by LaBTop
Show me your calculations to refute mine, not your avoidance of the subject by hoping the reader will believe your online credibility.
I showed you my calculations for my turn radius, do us a favor and show me were I made a miscalculation in my above post.
You can't, because it's perfectly right calculated.
With an error margin of 7 meters on a radius of 3200 meter....... Can you do better ?
Originally posted by Reheat
Originally posted by LaBTop
Any contra-arguments?edit on 8/6/12 by LaBTop because: (no reason given)
Yea, your turn radius is about % 40 too large.
Originally posted by Reheat
reply to post by exponent
Yes, that is very close to my own calculations. In fact, considering the resolution yours and mine are within a few meters of each other. However, you're dealing with a hard head that won't listen...
I'm finished until he determines where his measurements are wrong. Let him post his walls of text and see how much good it does for anything other than his ego...edit on 8-6-2012 by Reheat because: (no reason given)edit on 8-6-2012 by Reheat because: (no reason given)
Originally posted by LaBTop
Exponent, I admit your method is better and more exact than what I used.
Can you print your arc line also?
I would like to use your method on your hires aerial photo, since I think the plane's last recorded position as the NTSB reported it, is where we should start the chord. Not where you started it, on the lip of Edward Paik.
You know what I aim at, cover as many of the interviewed CIT witnesses positions as possibly can, with a turn radius arc that results in an acceptable bank angle when fed in that turn calculator..
A bank angle that is about what those 4 ANC workers showed in their CIT videos.
New decoding of FDR file.
The new decoding of the Flight Data Recorder (FDR), done by Warren Stutt, shows that there were 4 more seconds of data at the end of the file, previously not decoded. He thus confirms the work of John Farmer, who used radar records to show that several seconds of data had to be missing from the version of the FDR file initially available. More recently (2009) John has provided details of the process he went through to establish the time of impact from radar data in his “ Time Normalization ” paper.
Warren managed to decode the last section of the FDR file and we now see that the data describes a plane descending smoothly, pulling up safely and hitting the Pentagon near the ground, as so many eyewitnesses have reported. The impact time from the FDR agrees with the radar data to within 3 seconds.
Here is a convenient summary of some findings pertaining to the flight and its last moments. It includes the entire testimony of Penny Elgas who watched the impact and reported that a piece of the plane fell into her car, probably though the open sunroof.
The track set out in the FDR file corresponds closely with the track derived from the radar data. Radar cannot give accurate information near the ground and the FDR file previously had data missing from the end, hence there was a narrow window of opportunity for controversy.
...........................MAP...................................
Flight path as shown by the FDR and the damage trail
Above is an image of the area from the Navy Annex to the Pentagon. The yellow line is the track established by the trail of damage through the light poles and inside the Pentagon, the angle of which is confirmed by the FDR file and the radar tracks from four separate facilities. This is set out in a peer reviewd paper at the Journal of 9/11 Studies, AA77 on 9/11: New FDR Analysis.
The green line is the line of sight of Albert Hemphill from his vantage point high in the Navy Annex to the impact point on the Pentagon. You can see that the line passes over the Citgo service station. Hemphill repeatedly asserted in interviews and in statements that the plane passed over his right shoulder and dived straight over the bridge (the overpass of VA27 across Columbia Pike) hitting a light pole, and impacting the Pentagon. “It didn’t pull up, it didn’t turn right, it didn’t turn left. It went right into the Pentagon”. If it didn’t turn, it went straight. That is a pretty indisputable concept, yet some dispute it. Clearly his view of the plane at impact passed over Citgo but the plane did not.
Clearly there is no case to be made that the FDR file can show from which gate the plane departed.