“Stealth is not a cloak of invulnerability.” That truism, documented by U.S. Air Force testing, establishes the chilling comparison between China’s new J-35 and America’s F-15EX Eagle II. Both aircraft embody distinct design philosophies, but both are designed to dominate in their respective domains of air-to-air combat.
The J-35, formally commissioned with People’s Liberation Army Air Force service this month, is a fifth-generation low-observable stealth fighter derived from the FC-31 Gyrfalcon demonstrator. Its airframe is constructed to be low-observable: blended wing-body configuration, canted vertical fins, diverterless supersonic inlets, and radar-absorbing materials all work together to shrink its radar cross-section. Internal bays conceal up to six air-to-air missiles most notably the PL-15E, a compressed-carriage AESA-guided solid-fueled missile said to have a claimed range of 124 miles and two-way datalink. Folding fins also allow the PL-15E to fold fully into the bay without compromising stealth while arming the jet for beyond-visual-range (BVR) fighting.
This first-to-radar approach is aimed at what Chinese doctrine holds in high regard: “first look, first shot.” By compacting itself as much as possible and cross-referencing its AESA radar information with that from its electro-optical targeting sensor and infrared search and track (IRST), the J-35 could potentially get off a shot before an adversary even realizes it’s there. Theoretically, that would mean the F-15EX would be targeted before its own radar sweep has even had a chance to register contact.
The F-15EX, conversely, has no shame about being radar-visible. It preserves the wide cross-section of its 1970s lineage but equips the platform with current avionics and electronic warfare. Its AN/APG-82 AESA radar offers long-range, high-resolution tracking, and its IRST21 pod adds passive heat-signature detection crucial against stealth opponents. The Eagle Passive/Active Warning Survivability System (EPAWSS) integrates threat geolocation, jamming, and deception to give the F-15EX the ability to kill an enemy’s kill chain. In recent tests conducted by the U.S. Department of Operational Test and Evaluation, the EPAWSS demonstrated the ability to detect, track, and develop firing solutions against simulated fifth-generation targets with passive radar alone.
Missile capacity is where the Eagle II shines. With conformal fuel tanks and hardpoints, it can carry 22 air-to-air missiles three times the F-35’s internal load and many more than the J-35’s stealth-sparing configuration. This “magazine depth” means that if the fight deteriorates to within-visual-range (WVR) combat, the F-15EX can sustain repeated engagements without needing to refuel. Its twin General Electric F110-GE-129 engines, each producing approximately 29,500 pounds of thrust, propel it past Mach 2.4 and to over 60,000 feet of altitude, enabling high-energy maneuvering that few if any fighter aircraft can match.
The J-35’s propulsion, likely twin WS-21s at about 21,000 pounds of thrust each, supports supersonic dash and agile maneuvering but cannot rival the Eagle II’s raw thrust-to-weight ratio. Chinese engine technology is improving GE Aerospace executives concede Beijing is “catching up” yet U.S. turbofans still offer an order-of-magnitude advantage in reliability, with lifespans measured in thousands rather than hundreds of hours between overhauls.
In BVR combat, the J-35’s stealth and PL-15E armament could allow it to launch first, but the F-15EX’s IRST and electronic warfare may detect the J-35’s emissions or thermal signature early enough to evade or counterattack. Should the engagement close, the Eagle II’s superior kinematics and larger WVR missile loadout typically AIM-9X Sidewinders shift the advantage. The J-35’s helmet-mounted sighting and agility could contest this, but its smaller payload and lower thrust impose limits.
Soon, both sides fight with assistance. AWACS, electronic warfare jammer escorts, and networked data links swing the balance. The J-35 depends on avoiding detection; the F-15EX makes it through with sensors, jamming, and sheer muscle to blunt that first strike. Stealth and power are not certainties in the constantly shifting chess-like game of air combat they are gambits in a larger game of technology.
