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Engine · Air

Symphony

Turbofan propulsion system under development for the Overture airliner.

by Boom Supersonic · Unveiled Dec 13, 2022

DevelopmentEngineAirMilestoneDec 2, 2025
boomsupersonic.com/symphony
Cutaway concept rendering of the Boom Symphony engine showing internal components.

Photo: Courtesy of Boom Supersonic · Editorial use (company media kit) · Company concept rendering, not a photograph of operational hardware. Resized and converted to WebP; metadata removed; original framing and branding retained.

Milestones20222025
  1. UnveiledSymphony propulsion system announced, confirmed
  2. MilestoneConceptual Design Review completed, confirmed
  3. MilestoneCombustor rig testing announced, confirmed
  4. MilestoneStandardAero assembly partnership expanded, confirmed
  5. MilestoneFuel-nozzle ignition test update published, confirmed

Timeline5

  1. UnveiledConfirmed

    Symphony propulsion system announced

    SourcesBoom Supersonic

  2. MilestoneConfirmed

    Conceptual Design Review completed

    Boom retrospectively dated completion of Symphony’s Conceptual Design Review to October 2023. The review preceded component rig testing.

    SourcesBoom Supersonic

  3. MilestoneConfirmed

    Combustor rig testing announced

    Boom reported testing a resin model of a one-eighth sector of the combustor at full linear scale to assess airflow and pressure. The announcement does not establish a full-engine test or the precise test start date.

    SourcesBoom Supersonic

  4. MilestoneConfirmed

    StandardAero assembly partnership expanded

    Boom announced an expansion of its StandardAero partnership to include future Symphony assembly and testing in San Antonio. This records the agreement announcement, not serial production.

    SourcesBoom Supersonic

  5. MilestoneConfirmed

    Fuel-nozzle ignition test update published

    Boom published an update describing component ignition tests. The actual test dates were not established; this milestone dates the announcement, not a full engine first run.

    SourcesBoom Supersonic

Solid entries are confirmed, outlined reported, dashed estimated or still to come; dotted italic entries are speculative. Dates show only the precision the sources give.

Used in1

  • Concept rendering of Boom Overture on the ground, viewed from the front right.

    Overture

    DevelopmentAircraft

    Selected developmental propulsion system; not a claim that an airworthy Overture has flown.

    Link Confirmed

Sources4

  1. 1.
    CompanySymphony Ignition Test: What We Learned

    Boom Supersonic · Dec 2, 2025 · Supports: System milestone

    “a single fuel nozzle through a series of rigorous ignition tests”
  2. 2.
    CompanyBoom Supersonic Accelerates Overture Aircraft and Engine Development

    Boom Supersonic · Jul 23, 2024 · Supports: System milestone

    “expanded its existing MRO partnership with StandardAero to include the production of Symphony”
  3. 3.
    CompanySymphony Enters Rig Testing

    Boom Supersonic · Jun 27, 2024 · Supports: System milestone

    “successfully completed the engine’s Conceptual Design Review”
  4. 4.
    CompanyBoom Supersonic announces Symphony

    Boom Supersonic · Dec 13, 2022 · Supports: System, System milestone

    “today announced Symphony, a new propulsion system designed and optimized for its Overture supersonic airliner”

Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.