Otto Aerospace Phantom 3500 clears preliminary design review
Milestone advances the clean sheet composite business jet program into detailed design, engineering release and production planning.
Source | Otto Aerospace
Otto Aerospace (Fort Worth, Texas, U.S.) has successfully completed preliminary design review (PDR) for its Phantom 3500, a major technical milestone that advances the clean sheet business jet program from conceptual design into detailed design and production planning. The review was conducted during the last week of February 2026 at Otto Aerospace’s future home in Jacksonville, Florida.
PDR provided a comprehensive assessment of the Phantom 3500’s configuration, architecture, performance and overall design maturity across systems and structures. It also enabled Otto to freeze the aircraft’s aerodynamic design and major interfaces, giving engineering and supplier teams the definition needed to support the next phase of work.
“This is an important step for our team,” says Otto Aerospace president and CEO Scott Drennan. “Engineers often feel like PDR is a test, but I look at it as a celebration of their work. And, yes, they passed the test with flying colors. The Phantom 3500 has crossed the threshold from a promising concept to an aircraft we are preparing to build and fly. You can see it in the digital model, in the hardware we have built and in the maturity of the program. The work now is execution.”
Otto now advances the program into detailed design and engineering release, setting the stage for hardware fabrication and assembly as the company prepares for first flight of Flight Test Vehicle 1 in 2027. The flight test program will support Otto’s broader effort to demonstrate the producibility and performance of its applied laminar-flow technology, which is engineered to radically reduce the energy required for flight and form the foundation for a new category of highly efficient and sustainable aviation.
As the program moves from PDR toward critical design review (CDR) and aircraft build, Otto will remain focused on the work required to turn the Phantom 3500 into a certified production aircraft, including disciplined weight management, supplier execution, certification planning and protection of the aircraft’s core performance targets.
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