Boom selects Colorado site for Symphony engine testing

DENVER, April 25, 2025 — Boom Supersonic has announced that it has selected a site at the Colorado Air and Space Port in Watkins, Colorado, to conduct engine tests for its Symphony propulsion system. The site was previously used for hypersonic engine development. Symphony, the bespoke engine for Overture, is a medium bypass turbofan optimized for supersonic flight. Boom is investing $3-5 million into the site this year to prepare it for supersonic engine testing, slated to start later this year.

“Symphony is rapidly advancing from concept to reality. By leveraging an existing site, Boom will have the first independently owned supersonic engine test facility for less than it would have cost to rent a government facility,” said Blake Scholl, founder and CEO of Boom Supersonic. “By vertically integrating propulsion, we are able to accelerate development, reduce costs, and custom-tailor an engine for Overture—unlocking capabilities like Boomless Cruise.”

The Symphony engine test facility in Adams County, 35 miles from Boom’s headquarters, will support this year’s test of Symphony’s prototype core. Measuring 12 feet long and 4 feet in diameter, the core is the high-pressure spool of the engine, consisting of the compressor, combustor and turbine – the most critical components of the supersonic jet engine.

“This is an exciting moment not just for Adams County, but for the future of aerospace innovation in Colorado,” said Lynn Baca, chair of the Adams County Board of Commissioners. “Boom’s investment in our community puts us at the forefront of the aerospace industry and reflects our shared commitment to advancing next-generation transportation technologies.”

The Colorado Air and Space Port facility includes a control room and advanced instrumentation. Data collected from Symphony core tests will allow Boom to refine engineering and manufacturing design for Symphony. Boom expects to expand the site in 2026 to facilitate full-scale testing of the Symphony turbofan prototype.

“We are very excited to welcome Boom Supersonic to the Colorado Air and Space Port and to support the development of its revolutionary Symphony engine,” said Jeff Kloska, director of the Colorado Air and Space Port (CASP). “We look forward to a great partnership with Boom and to advancing our aviation and aerospace ecosystem at CASP.”

The Symphony engine continues to progress rapidly. In March, Symphony passed a key technical review, enabling the manufacturing launch. Multiple parts have already entered the manufacturing phase, and engine assembly will start later this year.

Once the program moves into production, Boom will use StandardAero‘s expert team and advanced facilities in San Antonio, Texas, to begin assembling Symphony engines.

In February, Boom’s XB-1 demonstrator broke the sound barrier six times without creating a sonic boom that was heard on the ground, opening the door to supersonic flight over land onboard Overture with Boomless Cruise. Overture has 130 orders and pre-orders from United Airlines, American Airlines, and Japan Airlines, representing the first five years of production at its Overture Superfactory in Greensboro, North Carolina.