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Boom Unveils Symphony Supersonic Engine
- fernly 4y agoCompany press release: https://mailchi.mp/boomsupersonic.com/supersonic-takes-shape-576667 https://mailchi.mp/boomsupersonic.com/supersonic-takes-shape... Company description of "Symphony" engine: https://boomsupersonic.com/symphony https://boomsupersonic.com/symphony Claims 10% lower operating cost, use of 100% sustainable fuel