The Celera 500L aircraft may fly soon
A few things off the top of my head that look odd:- Who is going to want to take the time to climb to 65,000 feet in this? People going transatlantic? They'll probably still take a Gulfstream.- Does it still get reasonable range economy at lower altitudes and true airspeeds?- Nobody will be able to see the runway over the nose on landing.- That door doesn't look like it'll hold up to pressurization.- The landing gear looks very light.- The engine is going to have very tight thermal and mechanical constraints based on its position in the rear of the fuselage.- I'm assuming it's a turbine engine in here? Trying to turbocharge something enough to get to 65,000 feet is going to be awful and very maintenance intensive.- Update: Nope, at least one V-12 with multiple turbochargers. If there is more than one engine the complex gearbox to drive the propeller will be difficult to get approved. See the Learfan aircraft [0].- The propeller is out on a long shaft, may cause issues.- The propeller is a pusher configuration, which isn't inherently bad, but causes efficiency losses from turbulent air coming off the fuselage.- Pusher configurations - especially pusher turboprops like the Piaggio Avanti are noisy.- Update: It's a piston engine. May not be as noisy because it appears that the exhaust is farther upstream than usual. However, cooling everything will be difficult.- High altitude flight introduces the possibility of coffin corners in the envelope and very little room between overspeed and stall.- That big engine (for high altitude flight) will reduce room in the cabin considerably.- Everybody and their mother will probably have a tail strike.Source: pilot and an aerospace engineering degree.[0]: https://en.wikipedia.org/wiki/LearAvia_Lear_Fan