death.by.chocolate
New Member
- Joined
- Aug 1, 2009
- Messages
- 300
- Likes
- 98
The canards of J20 are almost at the same plane of main wings, so the wave of overlying reflection is very small.
In fact stealth is not a mysterious tech, I believe to detect a stealth craft is not a matter for China/U.S./Russia, maybe even India and French could detect stealth.
Wrong, for two reasons first the canard is dihedral in lay person speak it is angled upwards.Close coupled canards are typically positioned above the wing an example of this arrangement is Rafale. This is the only way for a close coupled canard to generate lift for the wing. But since the wings of the J-20 is high mounted placing the canard above the wing wasn't an option for Chengdu. Chengdu designers had no choice so to achieve the right canard wing interaction they designed a dihedral canard that impacts the aircrafts supersonic performance(drag) and increases front aspect RCS.The canards of J20 are almost at the same plane of main wings, so the wave of overlying reflection is very small.
Second, the canard is used for pitch control even in straight level flight it is continuously actuated by the flight computer. The actuation itself creates 'Doppler scintillation' increasing the aircrafts RCS.
And please don't get me started on Chinese 'stealth detector'. The system you described works on a refinement of the triangulation technique called wide area multilateration using time-difference-of-arrival (TDOA). Wide area multilateration systems like the Chinese copy of VERA can detect and track cooperating aircrafts. Unless you expect the Raptor to 'cooperate' in Chinese airspace its completely ineffective against US LO aircrafts.In the below pictures is the stealth detector of China, it calculates the fluctuations of air background waves, then draw the track of stealth craft. Several years ago most cellphone stations in China already equipped the detector, that means enemy's stealth craft can be detected in Chinese territory, unless enemy destroy numberless cellphone stations, it sounds like a superiority of home ground.
We (US) do have the ability to detect LO radar observable aircraft using our AESA radar in combination with next generation sensors we've had it for sometime and I fully expect the system to be operationally deployed to coincide with induction of the J-20 or T-50.