




| Name | SM 39 Razor Fighter |
| Designation | SM 39 |
| Manufacturer / Developer | Stavatti Aerospace Ltd |
| Country / Lead partner | United States |
| Type / Role | Multirole air dominance and strike fighter |
| Status | Concept |
| Program Start | Publicly presented early 2020s |
| Estimated unit cost | est. 80 to 90 million USD |
| Public Source / Reference | Stavatti Aerospace official concept release |
| Operational Concept | High speed interception, air superiority, deep strike |
| Effective Range / Engagement Envelope | Long range, exact figures not disclosed |
| Speed / Response Time | Mach 2.5 cruise, up to Mach 4 claimed |
| Endurance / Sustained Operation | Above 70,000 ft estimated |
| Precision / Accuracy | Extended with large internal fuel volume |
| Mobility / Basing | Conventional land based airfields |
| Power Source | Aviation jet fuel |
| Power Output | est. 50,000 plus lbf thrust per engine |
| Propulsion Type | Twin variable cycle turbofan |
| Fuel / Energy Storage | Internal fuel bays |
| Primary Effect | Kinetic |
| Payload Mass / Warhead | Up to 25,000 lb total stores claimed |
| Guidance / Targeting | Radar, EO IR, GPS INS supported |
| Multi-mode Capability | Air to air, air to ground |
| Sensors | AESA radar, EO IR sensors |
| Autonomy Level | Human in the loop or au |
| AI Features | Sensor fusion, mission management |
| Communications & Datalinks | Secure tactical datalinks |
| Signature Reduction | Stealth shaping and internal carriage |
| Defensive Systems | Electronic warfare suite expected |
| Resilience | Redundant flight and mission systems |
| Integration | Networked C2 compatible |
| Suitable Platforms | Air force fighter squadrons |
| Interoperability Standards | US and allied tactical datalinks |
| Upgrade Path | Modular avionics and software driven updates |
| Export Control | ITAR controlled if developed |
| Legal/Ethical Flags | Autonomous combat employment |
| Policy Implications | High speed intercept and escalation risks |
| Notable Tests / Milestones | None publicly reported |
| Expected IOC (if given) | Not announced |
| Partners / Contractors | Not disclosed |
| Remarks | Concept design with unverified performance claims |
The SM-39 Razor Fighter is a bold next generation air dominance and multirole combat aircraft concept from Stavatti Aerospace. It aims to combine extreme speed, advanced stealth shaping, modern avionics and flexible mission roles into a single platform that could perform air superiority, long range strike and interception.
With a highly unusual triple fuselage layout, the Razor concept pushes aerodynamic design into new territory. It blends innovations like variable geometry air intakes, thrust vectoring nozzles and deep internal weapons bays with a structure built for sustained high speed flight.
Stavatti Aerospace Ltd, a U.S.-based aerospace design firm, developed the SM-39 Razor as an independent proposal for future combat air systems. The company describes it as a bridge between existing fighters and advanced future aircraft with optional autonomous operation.
Stavatti projects the SM-39 Razor could reach cruise speeds above Mach 2.5 and top near Mach 4 in dedicated flight regimes. Its engine concept uses next generation variable cycle afterburning turbofans for both high speed and efficient cruise. Estimated operational ceilings reach above 70,000 feet with a broad speed envelope from slow landing speeds to hypersonic cruise.
Based on public information, a typical per-unit flyaway cost is estimated near 85 million USD. The Razor is described as under development but does not yet have confirmed flight hardware or formal acquisition backing from U.S. military services.
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