Boeing F-15EX Eagle II: Mach 2.5, 29,500 lb Payload & 4th Gen Plus Fighter Specs
1. Overview
The Boeing F-15EX Eagle II is the latest and most advanced variant of the legendary F-15 Eagle family, developed for the United States Air Force as a cost-effective complement to the F-22 and F-35. Combining the proven F-15 airframe with modern avionics, sensors, and weapons, the Eagle II is designed to carry massive payloads at supersonic speeds while serving as a "missile truck" and electronic warfare platform. First flown in 2021, the F-15EX entered service in 2024 and is planned to replace aging F-15C/D models.
The F-15EX was developed under the Air Force's requirement for a bridge between legacy 4th-generation fighters and the 5th-generation F-35. While the F-35 excels at stealth and sensor fusion, the F-15EX offers unmatched payload capacity and lower operating costs. The aircraft is based on the F-15QA (Qatari Advanced) and incorporates the latest technologies from the F-15SA and F-15SG, including fly-by-wire controls, AESA radar, and advanced electronic warfare systems.
The aircraft's name "Eagle II" honors the legacy of the original F-15 Eagle, which has never been shot down in air-to-air combat. The F-15EX is not a stealth fighter, but its combination of speed, payload, and advanced sensors makes it a formidable platform for air superiority, strike warfare, and air defense. With an initial procurement of 144 aircraft (and potential for more), the Eagle II will serve alongside the F-35 through the 2040s and beyond.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Top Speed | Mach 2.5 (1,650 mph / 2,655 km/h) at altitude |
| Combat Radius | 790+ nautical miles (909+ mi / 1,463+ km) with external tanks |
| Range | 2,400+ nautical miles (2,760+ mi / 4,445+ km) ferry |
| Service Ceiling | 60,000 ft (18,288 m) |
| G-Limits | +9.0g |
| Engine | 2 × General Electric F110-GE-129 turbofans |
| Thrust (each) | 29,500 lbf (131 kN) with afterburner |
| Length | 63 ft 9 in (19.4 m) |
| Wingspan | 42 ft 10 in (13.1 m) |
| Height | 18 ft 6 in (5.6 m) |
| Empty Weight | 34,600 lb (15,700 kg) |
| Max Takeoff Weight | 81,000 lb (36,740 kg) |
| Internal Fuel | 13,500 lb (6,125 kg) |
| Conformal Fuel Tanks | 9,000 lb (4,082 kg) additional |
| Weapons Payload | 29,500 lb (13,380 kg) on 15 hardpoints |
| Air-to-Air Missiles | 12 × AIM-120 AMRAAM or 8 × AIM-120 + 4 × AIM-9X |
| Air-to-Ground Weapons | GBU-31/38 JDAM, GBU-54 Laser JDAM, AGM-158 JASSM, AGM-88 HARM |
| Gun | 1 × 20mm M61A2 Vulcan cannon (480 rounds) |
| Radar | Raytheon AN/APG-82(V)1 AESA |
| Electronic Warfare | BAE Systems AN/ALQ-250 Eagle Passive/Active Warning Survivability System (EPAWSS) |
| Cockpit | Glass cockpit with wide-area display (11x19 inch) |
| Crew | 1 (F-15EX) or 2 (F-15EX training variant) |
| First Flight | February 2, 2021 |
| Introduction | 2024 (USAF) |
| Status | Active, in production |
3. Velocity Engineering
The F-15EX's aerodynamic design is based on the proven F-15 airframe, which has accumulated millions of flight hours over 50 years of service. The wing features a moderate sweep (45 degrees) and advanced airfoils that provide exceptional lift and maneuverability across the flight envelope. The airframe is constructed primarily of aluminum alloys, with titanium in high-temperature areas such as the engine bays and leading edges. The conformal fuel tanks, mounted along the fuselage sides, add fuel without increasing drag as much as external tanks.
Power comes from two General Electric F110-GE-129 turbofans, each producing 29,500 pounds of thrust with afterburner. These engines provide a thrust-to-weight ratio exceeding 1.2 at combat weight, enabling the Eagle II to accelerate rapidly and sustain 9g turns even with a heavy weapons load. The engines are fed by variable-geometry inlets that automatically adjust to maintain optimal airflow at all speeds and altitudes, ensuring maximum performance across the flight envelope.
The flight control system is a full-authority digital fly-by-wire system, a significant upgrade from the original F-15's mechanical controls. The system provides carefree handling throughout the envelope, automatically limiting control inputs to prevent overstress while allowing the pilot to focus on the mission. The fly-by-wire system also enables the F-15EX to carry a wider range of weapons and external stores without compromising handling.
The Eagle II's maximum speed of Mach 2.5 is among the highest of any operational fighter. At this speed, the airframe experiences significant heating, requiring special materials and thermal protection. The aircraft can supercruise at Mach 1.2 without afterburners when lightly loaded, though the F-15EX is typically too heavy for sustained supersonic flight without afterburners. The combination of speed and payload makes the Eagle II a formidable interceptor and strike platform.
4. Systems & Technology
AN/APG-82(V)1 AESA Radar: The F-15EX features the most advanced fighter radar in production, capable of detecting and tracking multiple targets at ranges exceeding 100 miles. The AESA (Active Electronically Scanned Array) radar provides simultaneous air-to-air and air-to-ground modes, with high-resolution synthetic aperture radar mapping for target identification. The radar can also perform electronic attack functions, jamming enemy radar while continuing to search for targets.
EPAWSS Electronic Warfare Suite: The Eagle Passive/Active Warning Survivability System (EPAWSS) is a state-of-the-art electronic warfare suite that detects, identifies, and counters enemy radar threats. The system provides all-aspect radar warning, passive target geolocation, and electronic attack capabilities. EPAWSS can cue the radar to stare at threats with minimal emissions, enabling "silent targeting" against enemy air defenses.
Cockpit and Avionics: The F-15EX features a glass cockpit with a large 11x19 inch touchscreen display, similar to the F-35's panoramic display. The cockpit includes a wide-angle head-up display, helmet-mounted cueing system (JHMCS), and hands-on throttle and stick (HOTAS) controls. The avionics suite includes GPS/INS navigation, digital moving maps, and integrated data links (Link 16). The open architecture mission systems allow rapid software updates and capability insertion.
Weapons Integration: The F-15EX's 15 hardpoints (five under each wing, three under fuselage, plus two on conformal tanks) carry the widest range of weapons in the USAF inventory. The aircraft can carry 12 AIM-120 AMRAAMs for air superiority missions, or a mix of air-to-ground weapons for strike operations. The Eagle II is the only fighter capable of carrying the 5,000 lb GBU-28 bunker buster and the AGM-158 JASSM cruise missile.
Digital Backbone: The F-15EX incorporates a modern digital backbone with high-speed data buses and an open architecture mission computer. This allows the aircraft to serve as a "quarterback" for unmanned aircraft, controlling Collaborative Combat Aircraft (CCAs) in future operations. The digital architecture also enables rapid software updates, ensuring the Eagle II can counter emerging threats throughout its service life.
5. Operational Role
The F-15EX Eagle II performs critical missions for the US Air Force:
Air Superiority: With 12 AIM-120 AMRAAMs, the F-15EX can engage multiple targets at beyond-visual-range, serving as a "missile truck" that complements the F-22 and F-35. The Eagle II's radar and electronic warfare suite allow it to detect and track threats at long range, passing targeting data to stealth fighters via data link. In visual-range combat, the F-15EX retains the Eagle's legendary maneuverability.
Strategic Strike: The F-15EX can carry heavy air-to-ground weapons, including JASSM cruise missiles and GBU-28 bunker busters. With its long range and high speed, the Eagle II can strike targets deep in enemy territory, using its electronic warfare suite to suppress enemy air defenses. The aircraft's payload capacity allows it to carry more weapons than a B-17 bomber.
Air Defense: The F-15EX is ideal for homeland defense missions, where its speed enables rapid response to threats. The aircraft can intercept bombers, cruise missiles, and other threats at long range, using its AESA radar to track multiple targets simultaneously. The Eagle II's endurance allows it to patrol for extended periods, reducing the number of aircraft required for continuous coverage.
Electronic Attack: With the EPAWSS electronic warfare suite, the F-15EX can conduct electronic attack missions, jamming enemy radar and communications while other aircraft engage targets. The aircraft's high speed and payload allow it to carry specialized electronic warfare pods for enhanced capability.
The USAF plans to acquire 144 F-15EXs, replacing aging F-15C/D models in Air National Guard and active duty units. The aircraft will be based at Eglin AFB, Florida; Portland ANGB, Oregon; and other locations. The F-15EX has already demonstrated its capabilities in exercises, proving that the Eagle II can hold its own against 5th-generation fighters.
6. Performance Analysis
F-15EX vs F-35A Lightning II: The F-35 offers stealth, sensor fusion, and networking that the F-15EX cannot match. The F-15EX carries heavier payloads (29,500 lb vs 18,000 lb) and has higher top speed (Mach 2.5 vs 1.6). The F-15EX's operating cost is lower ($20,000/hour vs $25,000/hour), and it can carry weapons externally that the F-35 must carry internally. The two aircraft are complementary: F-35s penetrate defended airspace; F-15EXs deliver heavy firepower in permissive environments and serve as missile trucks for beyond-visual-range engagements.
F-15EX vs F-15E Strike Eagle: The F-15EX represents a 30% performance improvement over the F-15E. The EX has more powerful engines (29,500 lb vs 29,000 lb), better radar (APG-82 vs APG-70/82), and an advanced electronic warfare suite that the F-15E lacks. The EX's fly-by-wire controls improve handling and reduce pilot workload. The EX's open architecture mission systems enable rapid upgrades that the F-15E's 1980s-vintage avionics cannot support. The F-15E will remain in service through the 2030s, but the EX is the future of the Eagle family.
F-15EX vs Su-57: Russia's Su-57 is a 5th-generation fighter with stealth features, but its stealth is less mature than the F-35's. The F-15EX's APG-82 radar can detect the Su-57 at ranges exceeding 100 miles, while the Su-57's radar is believed to have shorter range. The F-15EX's electronic warfare suite can jam the Su-57's sensors, and its speed and payload give it advantages in beyond-visual-range combat. In close-in combat, the Su-57's thrust vectoring gives it an edge, but the F-15EX's 9g capability and proven dogfighting skills make it a formidable opponent.
7. The Eagle's New Era
The Boeing F-15EX Eagle II represents a new era for the legendary Eagle family. For 50 years, the F-15 has dominated the skies, with over 100 air-to-air victories and no losses in air combat. The Eagle II builds on this legacy, combining the proven airframe with the most advanced sensors, weapons, and electronic warfare systems ever fitted to a fighter. The result is an aircraft that can hold its own against any threat, anywhere in the world.
The F-15EX's role in the future force is clear: it will serve as a missile truck, electronic warfare platform, and heavy strike fighter, complementing the stealthy F-22 and F-35. While the F-35 excels at penetrating defended airspace, the F-15EX carries the heavy weapons that make the difference in major combat operations. The Eagle II's 12 AMRAAMs can engage multiple targets at once, overwhelming enemy defenses and clearing the sky for follow-on forces.
The F-15EX's affordability is another key advantage. At $90 million per copy, the Eagle II costs about half as much as the F-35 and much less than the F-22. This allows the Air Force to buy more aircraft, maintaining force structure in an era of budget constraints. The F-15EX's low operating costs and high reliability ensure that it will be available when needed, generating sortie rates that stealth fighters cannot match.
For the pilots who fly it, the F-15EX is the ultimate Eagle. It has the speed, power, and payload of the original, combined with the sensors and systems of the 21st century. It is a fighter that can do it all—air superiority, strike, air defense, electronic attack—and do it better than any other 4th-generation aircraft. The Eagle II is not just a continuation of the legacy; it's a new beginning, proving that the Eagle can still soar higher, faster, and farther than anything else in the sky.
Sources & Further Reading
- Boeing F-15EX Product Card
- General Electric F110 Engine Data
- Raytheon AN/APG-82 AESA Radar
- BAE Systems EPAWSS Electronic Warfare Suite
- USAF F-15EX Fact Sheet
📌 RELATED ARTICLES FROM SPEEDO SCIENCE
→ Boeing F-15E Strike Eagle: Dual-Role Fighter
→ Lockheed Martin F-35 Lightning II: 5th Gen Fighter
→ Lockheed Martin F-22 Raptor: Air Superiority
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