Facts summary and sources
Lockheed Martin SR-72 Son of Blackbird: speed field: Mach 6.0 (Design target / estimate; not a demonstrated record). First flight: Not publicly confirmed.
This is a secondary compilation. A source-check date applies only to the listed claim, not to the whole page or its translation. A page update is not a source check.
Sources and check records
- USNI News: historical Lockheed Martin SR-72 interview — The 2013 report describes a Mach 6 design concept. It does not establish a demonstrated speed or a confirmed first flight. [Historical design target] · Source checked for this claim: 2026-09-28
✈️ Full Specifications
| Designation | SR-72 |
| Manufacturer | Lockheed Martin Skunk Works |
| Country | 🇺🇸 United States |
| First flight | Not publicly confirmed |
| Speed target / estimate (Mach) | 6 |
| Speed evidence basis | Design target / estimate; not a demonstrated record |
| Engine | TBCC (Turbine-Based Combined Cycle) + Scramjet |
Overview
The SR-72, often called the “Son of Blackbird,” is a proposed hypersonic aircraft concept associated with Lockheed Martin’s Skunk Works. Its widely reported Mach 6 goal is a design target, not a publicly verified flight result. It envisages reconnaissance and possible strike roles beyond those of the SR-71.
Design & Development
The proposed turbine-based combined-cycle system would combine turbine propulsion at lower speeds with a ramjet/scramjet flow path at higher speeds. In a 2013 interview, Lockheed Martin’s hypersonics programme manager discussed the challenge of connecting these operating regimes. This describes an engineering concept, not a demonstrated SR-72 propulsion envelope.
Expected Capabilities
- Proposed speed: Mach 6; design target.
- Proposed missions: intelligence, surveillance, reconnaissance and possible strike.
- Airframe dimensions, flight ceiling and operational performance: not treated here as verified flight results.
A fixed km/h equivalent requires a specified air temperature. High speed alone does not establish invulnerability or worldwide reach within a fixed travel time.
Status
No publicly confirmed SR-72 first-flight date has been established from the sources cited on this page. Earlier schedules and reports of possible demonstrator activity are not evidence of an operational aircraft. First flight, service entry and demonstrated maximum speed should therefore remain unconfirmed.
Frequently Asked Questions
How fast is the SR-72 intended to fly?
The public concept is associated with a Mach 6 design goal. No SR-72 flight-speed record is established here.
Has the SR-72 flown?
This page does not have a primary-source flight confirmation. Rumours and earlier target dates should not be displayed as completed milestones.
How would it reach hypersonic speed?
The proposed combined-cycle approach joins turbine propulsion and a ramjet/scramjet flow path; its precise flight performance remains unverified publicly.
References & Sources
- USNI News — original interview with Lockheed Martin hypersonics programme manager, November 5, 2013 (historical concept; not current flight confirmation).
- NASA Glenn — speed of sound and temperature.