Truth: the F-20 nose core secrets exposed
of the 2001 test flight photos of the F-20 fighter
F -20 nose mysterious device has triggered a lot of friends and a lot of imagination. There are technical experts have its real situation.
early map can be seen very clearly, this thing is a pressure sensor.
head a four-head of the bar hexagonal, upper and lower two groups, symmetrical distribution. Each hexagon long port cover is equipped with three sensors, photo point of view is the three white dots. In fact, the white point in the inlet on the drum kit is this thing, just do not know the sensor is on the drum kit will follow to the production models.
, some people may not quite understand this thing about the way science.
this thing called …… and forget and let us call it a distributed pressure sensor. Anyway, is to replace the pitot things.
demonstrator experiment at the same time equipped with pitot, compensation pitot and distributed pressure sensor . Verify flight to the pressure sensor data and the pitot match, which distributed pressure sensor data and the corresponding relationship between the flow field characteristics. In formal models to cancel the destruction of the the stealth traditional airspeed tube to reduce the complexity of the body surface protrusions.
B-2 to stealth in the end, so use this devices. Groups of four sensors, head up and down all three groups. F-22 do not know what considerations, but still relatively traditional gun-shaped pitot. It is now generally agreed that the F-22 stealth performance is better than B-2, why the B-2, but also so radical technology? Even because of the damp of the sensor lead to the crashed one. Of course, the reason is related to the important secrets of the United States, such as real-RCS B-2 and F-22 class. Perhaps the B-2 stealth performance is actually higher than the F-22.
this thing, in turn, analysis, analysis canopy bulkhead, come to J-20 stealth performance better conclusion. After all, this is designed to avoid the pitot short board for stealth. So the J-20 stealth performance may be far better than 1:00 of early indicators of a few may even be better than the F-22.
the way to analyze the J-20 EODAS it, because some people think this flap is EODAS.
distributed photoelectric sensor of the J-20 has six windows, respectively, the canopy in front, between a radome, cockpit cover behind the small drum kit, head side, left and right a protruding belly magazine behind, before and after each one. Thus forming a complete spherical field of view covered. In addition to the belly, and the remaining four are quadrilateral, the belly is temporarily not see. Of course, in order to stealth, the glass is coated, so dark it. The window location of the F-22 and J-20 is very close to, but the F-22 the following before and after the vision of the drum package is at the head end of the front landing gear compartment. But it is easy to find the window of J-20 F-22 is much larger. Hope the size of the increase is to improve the performance.
the F-22 part of the forward-looking sensor mounted to the cockpit cover inside. In order to facilitate comparison, this Figure F-22 image.
I also remember the F-35 propaganda claims to be the fighter of the first the equipment EODAS system. And there is obviously a huge optical window. F-22 do not export, there is the possibility of strategic Fudge. But I think it more likely that the F-22 is the incomplete EODAS, such as the lack of acquisition of certain wavelengths of capacity or system integration deficiencies class. A knowledgeable person may be from the window size analysis and the reasons for it. Otherwise hard to imagine even three generations of machines have photoelectric sensors of the F-22 did not.
incidentally, posted a drawing, showing the F-22′s rear vision.
AN/AAR-56 infrared missile warning devices, the F-22 is equipped with six.
AN/AAR-56 infrared missile warning device is equipped with the F-22 6.
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1 IFDL (Intra-Flight, the Data Link) data link antenna
electronic equipment cabin
3 Side MLDs (AN/AAR-56 missile approach warning window)
4 distributed pressure sensors
5 mine Article
6 L-type pitot
7 the Upper MLDs (AN/AAR-56 missile approaching warning window)
No wonder 22 window is so small. However, since the requirements are a full range of coverage, similar to the installation location and one can understand.
F-20 with 22 head next to the static pressure hole pairs with the pitot used to measure the atmospheric static pressure, dynamic pressure + static pressure=total pressure=parameter, it is estimated that many people recognize this formula! Used to calculate the flow rate, flow rate side can be understood as the relative speed of the aircraft.
this corner reflectors.