Otto Aerospace clears key design milestone for business jet planned at Jacksonville facility (Courtesy of the Jacksonville Business Journal) — A next-generation business jet planned for production in Jacksonville has cleared a key technical milestone, giving Otto Aerospace the design foundation it needs to move from concept toward build.
Otto Aerospace said it has completed the preliminary design review for its Phantom 3500, the clean-sheet business jet the Fort Worth, Texas-based company plans to manufacture at a $430 million facility at Cecil Airport.
The review, conducted at Otto’s future home in Jacksonville, advances the program from conceptual design into detailed design and production planning. For Jacksonville, the milestone is another step toward turning one of the city’s most closely watched economic development projects into an operating aircraft manufacturing hub.
“This is an important step for our team,” said 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 amazing 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. We are focused on building this aircraft on time, while proving that our laminar-flow aircraft can do exactly what we said it would do.”
The Phantom 3500 is Otto’s planned next-generation transonic, fuel-efficient jet, built around the company’s laminar-flow technology. Otto has described the aircraft as the foundation for a new category of highly efficient, affordable and sustainable aviation.
The preliminary design review assessed the aircraft’s configuration, architecture, performance and overall design maturity across systems and structures, according to the company. The process also allowed Otto to freeze the jet’s aerodynamic design and major interfaces, giving engineering and supplier teams the definition needed for the next phase of development.
Otto now moves into detailed design and engineering release, setting the stage for hardware fabrication and assembly as the company prepares for the 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 the company says is engineered to radically reduce the energy required for flight.
“Completing PDR reflects more than a year of disciplined work by the Otto team, our suppliers and our development partners,” said Otto Aerospace Chief Technology Officer Kyle Heironimus. “Aircraft development depends on thousands of decisions made with speed, quality, safety and certification rigor in mind. I’m proud of how this team worked together to reach this milestone and put the Phantom 3500 in position for the next phase of execution.”
The milestone comes shortly after Otto announced a planned leadership transition that elevated Drennan from president and chief operating officer to CEO. Drennan, an aviation and aerospace veteran, previously served as vice president of innovation and advanced concepts at Bell Textron and was a founding member of Supernal, Hyundai’s aerospace division.
He took over from Paul Touw, who had served as CEO since 2022.
During his time as COO, Drennan led Otto through several milestones, including the Phantom 3500’s preliminary design review and independent test flights of Otto’s advanced laminar flow drone, produced in partnership with the Defense Advanced Research Projects Agency.
The company’s Jacksonville facility is expected to be the manufacturing hub for the Phantom 3500. Otto is on the cusp of beginning construction on the Westside project, which is backed by a $35 million city incentives package.
As the program moves toward critical design review and aircraft build, Otto said its focus will shift to disciplined weight management, supplier execution, certification planning and protecting the aircraft’s core performance targets.
“The aviation world has dreamed of practical laminar-flow flight for years,” Drennan said. “With PDR complete, we are one major step closer to delivering it.”
Photo courtesy of Otto Aerospace