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Shenyang J-31 quad-tail design is stealthy in seven different ways
1. The canted vertical stabilizer deflects X-band radar waves (coming in from the side) toward the ground and away from the emitting enemy aircraft. This increases side-aspect stealth.
The J-31 canted vertical stabilizer deflects incoming side X-band radar waves downward and away from the emitting aircraft.
2. The large canted vertical stabilizer hides a significant portion of the rear fuselage from enemy radar (coming in from the side).
3. The horizontal stabilizer secondarily deflects radar waves, which bounced off the canted vertical stabilizer, into the sky and away from both enemy ground sensors and the emitting enemy aircraft.
The J-31 vertical and horizontal stabilizers work together to deflect incoming side X-band radar waves skyward.
4. The horizontal stabilizers extend beyond the engine nozzles to provide greater radar and infrared stealth by blocking a direct line-of-sight view from the side.
Do you see the fifth-generation J-31 rear horizontal stabilizers (e.g. plane on the right) extending beyond the engine nozzles to increase radar and infrared stealth from the side aspect/view? Compare the J-31 to the fourth-generation J-11. Do you see how the J-11 horizontal stabilizers do not extend beyond the engine nozzles and the J-11 is therefore less stealthy?
5. The horizontal stabilizers obey planform alignment to reduce the number of reflected angles off the wing edges.
There are approximately seven planform angles on the J-31. Planform alignment is easy to check. You just look for parallel wing edges to reflect radar. To be absolutely sure, you should examine multiple photographs for planform alignment. Planform angles are shown in red pair, orange, green, blue, purple, pink, and brown.
6. The horizontal stabilizers are located behind the main wing. This increases frontal stealth, because the horizontal stabilizer/control surface does not increase the surface area seen by an enemy radar from the front.
The J-31 main wings block the rear horizontal stabilizers from the frontal view of an enemy aircraft.
7. The canted and horizontal stabilizers (e.g. quad-tail design) are coated with RAM (radar absorbent material) to dramatically reduce the J-31 X-band radar return by 99.684% per incoming X-band radar-wave reflection off a J-31 surface. Bouncing off the vertical canted stabilizer counts as one reflection. A secondary bounce off the horizontal stabilizer counts as another reflection.
Also, the Chinese engines are ready:
WS-10A engine for J-10B Vigorous Dragon fighter in mass production
WS-10A engine (with gearbox at the bottom) is designed to power the J-10B Vigorous Dragon fighter. This version of the WS-10A turbofan engine is said to have 13.2 ton maximum thrust. There are several wrapped engines near the floor.
1. The canted vertical stabilizer deflects X-band radar waves (coming in from the side) toward the ground and away from the emitting enemy aircraft. This increases side-aspect stealth.
The J-31 canted vertical stabilizer deflects incoming side X-band radar waves downward and away from the emitting aircraft.
2. The large canted vertical stabilizer hides a significant portion of the rear fuselage from enemy radar (coming in from the side).
3. The horizontal stabilizer secondarily deflects radar waves, which bounced off the canted vertical stabilizer, into the sky and away from both enemy ground sensors and the emitting enemy aircraft.
The J-31 vertical and horizontal stabilizers work together to deflect incoming side X-band radar waves skyward.
4. The horizontal stabilizers extend beyond the engine nozzles to provide greater radar and infrared stealth by blocking a direct line-of-sight view from the side.
Do you see the fifth-generation J-31 rear horizontal stabilizers (e.g. plane on the right) extending beyond the engine nozzles to increase radar and infrared stealth from the side aspect/view? Compare the J-31 to the fourth-generation J-11. Do you see how the J-11 horizontal stabilizers do not extend beyond the engine nozzles and the J-11 is therefore less stealthy?
5. The horizontal stabilizers obey planform alignment to reduce the number of reflected angles off the wing edges.
There are approximately seven planform angles on the J-31. Planform alignment is easy to check. You just look for parallel wing edges to reflect radar. To be absolutely sure, you should examine multiple photographs for planform alignment. Planform angles are shown in red pair, orange, green, blue, purple, pink, and brown.
6. The horizontal stabilizers are located behind the main wing. This increases frontal stealth, because the horizontal stabilizer/control surface does not increase the surface area seen by an enemy radar from the front.
The J-31 main wings block the rear horizontal stabilizers from the frontal view of an enemy aircraft.
7. The canted and horizontal stabilizers (e.g. quad-tail design) are coated with RAM (radar absorbent material) to dramatically reduce the J-31 X-band radar return by 99.684% per incoming X-band radar-wave reflection off a J-31 surface. Bouncing off the vertical canted stabilizer counts as one reflection. A secondary bounce off the horizontal stabilizer counts as another reflection.
Also, the Chinese engines are ready:
WS-10A engine for J-10B Vigorous Dragon fighter in mass production
