Venus Aerospace has not publicly released detailed specific impulse (ISP) data for their Rotating Detonation Rocket Engine (RDRE) or the VDR2 (a rocket-based combined cycle engine integrating RDRE with ramjet modes) across Mach speeds. However, based on their claims of 10-15% efficiency gains over conventional rocket engines, partnerships with NASA and DARPA, and general RDRE ...

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Link :
https://www.nextbigfuture.com/2025/07/venus-aerospace-isp-estimates-from-0-to-mach-10.html