Perhaps one of the most unique and interesting concept jets to hit the NBAA conference floors is the Otto Phantom 3500. What makes it unique is its laminar flow design, transonic speeds, and proposed 50% less operating costs. It’s convincing enough for Flexjet to order 300 of them. We caught up Otto’s J. Scott Drennan at NBAA-BACE 2025 for a walkaround and explanation.
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Very cool looking concept, it will be interesting to see how it actually performs once designed. Seems early for an order of 300 though
Always great to hear new concepts under development, whether or not this is a commercial success will depend on a lot of variables, but either way there will be technological advancements that come from this that will advance aviation development in the future. Best wishes to OTTO Aerospace.
This is a really cool looking jet but the reality is that maintaining laminar flow over large aircraft surfaces at speeds in excess of 200 mph is extremely difficult even without windows in the aircraft. The Phantom 3500 is designed to cruise at mach 0.75 with a swept wing and that means a very high Reynolds number and significant crossflow over the wing both of which are huge impediments to maintaining laminar flow. The the science and engineering on this topic has been well established for years and without active boundary layer control systems it is not practical. Even with them it is cost prohibitive. Also note that the Otto Celera 500 fell far short of its performance goals and never came close to being certified.
Understanding the physics of flight and translating them into reality are two sides to this coin. Beechcraft/Rutan’s starship design is a case in point. Extraordinary claims require extraordinary proof. Let’s sit back and watch what really emerges.
Otto Aviation know more about aerodynamics and aircraft performance than me and I wish them all the best. Nonetheless, please allow me to be provocational and suggest that we dwell on Lilium for a while.