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Originally posted by Rockpuck
The DU explosives would explain how a aluminum hull of an aircraft punctrured all those reinforced concrete walls.... I always personally believed a tectical nuclear weapon or a DU weapon was used in the lower levels of the WTC as well, which would explain why so many develop odd cancers and such.
Originally posted by Rockpuck
The DU explosives would explain how a aluminum hull of an aircraft punctrured all those reinforced concrete walls....
Originally posted by Griff
Agreed SNAFU. I still would like to know more details of your friends story. I'm not disputing it at all, I just am curious. Thanks.
Originally posted by snafu7700
Originally posted by Griff
Agreed SNAFU. I still would like to know more details of your friends story. I'm not disputing it at all, I just am curious. Thanks.
at the time, he worked in the section that was hit...just pure dumb luck that he was late for work that day. i dont know his exact location at the time, but he swears that he saw a b757 with AA markings slam into the pentagon. like i said, i cant provide anything even remotely resembling proof to back up his story, but he is someone i trust implicitly.
Originally posted by jprophet420
in all seriousness now, did he know a boeing 757 from any other civilian aircraft at the time it happened?
Originally posted by HowardRoark
If it was a Global Hawk, how come the Rolls Royce engineer stated that this:
Was not a part manufactured in the factory where Global Hawk engines are made?
How come?
Originally posted by Zaphod58
The fan blades tend to shatter into tiny pieces when they're hit by anything. Ever seen an engine that hits a BIRD? A 5 pound bird has the potential to completely destroy a jet engine. For that matter I've seen fan blades cracked and bent from a ROCK going down the engine. The blades would be in such tiny pieces after going through the wall that there would be no way to identify them. You have to remember the pressure that is put on a fan blade. Yes they're titanium, but you're talking about severe pressure on them as they spin.
Based on the sizes of the person standing next to the debris and other objects in the photographs that we can use for comparison, we estimate that the disk is approximately 25 to 30 inches (63.5 to 76.2 cm) across. Obviously, this piece is far smaller than the maximum engine diameter of 6 feet (1.8 m) or more leading many to draw the conclusion that the item is not from a 757 engine. That conjecture causes conspiracy theorists to believe that a much smaller vehicle must have struck the Pentagon instead.
However, we have already seen that rotating components within a turbofan engine can vary widely in size. In order to determine whether this component could have possibly come from a 757, we need to take a closer look at the engine installed aboard the aircraft registered N644AA. Boeing offered two different engine options to customers of the 757-200. Airlines could choose between the Pratt & Whitney PW2000 family or the Rolls-Royce RB211 series. The particular engine model chosen by American Airlines for its 757 fleet was the RB211-535E4B triple-shaft turbofan manufactured in the United Kingdom
Using these images and other diagrams of the RB211-535 engine, we can obtain approximate dimensions of the engine's rotary disks for comparison to the item found in the Pentagon rubble. Our best estimate is that the engine's twelve compressor disk hubs are about 36% the width of the fan. The five turbine disk hubs appear to be slightly smaller at approximately 34% the fan diamter. According to Brassey's World Aircraft & Systems Directory and Jane's, the fan diameter of the RB211-535E4B engine is 74.5 inches (189.2 cm). It then follows that the compressor disk hubs are approximately 27 inches (69 cm) across while the turbine disk hubs are about 25 inches (63.5 cm) in diameter. Both of these dimensions fit within the range of values estimated for the engine component pictured in the wreckage at the Pentagon.
We can take this analysis a step further by also exploring some of the alternate theories that have been put forward by those believing this object comes from a different aircraft. Two of the most common claims we have seen suggest that the plane used in the attack was a Douglas A-3 Skywarrior or a Northrop Grumman RQ-4 Global Hawk. The A-3 is an airborne jamming aircraft originally ordered by the US Navy during the 1950s. The type is now retired from front-line service though a handful are still used for testing purposes by the defense contractor Raytheon. The Global Hawk is an unmanned aerial vehicle used by the Air Force for reconnaissance missions. Neither of these planes bears more than a superficial resemblance to the 757, but we will accept the possibility that they could be mistaken for a commercial airliner given the confusion on September 11.
For the sake of this investigation, the only issue we shall consider is the engines that power both planes. The A-3 was equipped with two Pratt & Whitney J57 turbojets like that pictured below. The J57 dates to the early 1950s and is rather antiquated by today's standards.
Using photos and cut-away drawings of these three engines, we can estimate the diameters of the compressor and turbine rotors just as we did for the RB211. The results of these comparisons are summarized in the following table.
Engine Overall Diameter Compressor Hub Diameter
(estimated) Turbine Hub Diameter
(estimated)
PW J57 40.5 in (102.9 cm) 16 in (40.6 cm) 18 in (45.7 cm)
PW JT8D 49.2 in (125 cm) 21.5 in (54.6 cm) 22.5 in (57.1 cm)
RR AE3007H 43.5 in (110.5 cm) 14 in (35.6 cm) 15 in (38.1 cm)
This analysis indicates that all three of these engines are too small to match the engine component photographed at the Pentagon. Some sites also suggest the part might be from the aircraft's auxiliary power unit (APU). An APU is essentially a small jet engine mounted in the tail of an aircraft that provides additional power, particularly during an emergency. However, APUs tend to be much smaller than jet engines, and the component pictured at the Pentagon is too large to match any found in an APU. It has also been suggested that the attack was conducted by a cruise missile like the Tomahawk or Storm Shadow, but these and other weapons are powered by engines no more than 15 inches (38 m) across. These powerplants are obviously far too small to account for the Pentagon wreckage.
Originally posted by Agit8dChop
Because
A. If your working on top secret military jet technology, chances are your not going to release a statement claiming down technology to be yours.