Feasible Subsonic VTOL

This is most probably the biggest update to my LNG VTOL design. Now on I don’t need to mention that it uses LNG as fuel. All my aerospace vehicles consume liquid methane and LOX. Only the orbit assembled space crafts have special fuels depending on the mission.

The final design update is related to the horizontal thrust engine. In order to attain ultra-high bypass (22:1) air to improve the efficiency, I needed to add ducts to fuselage. Unlike the ducts of turbofan engines, they would be curved around the fuselage and most importantly would be almost hollow inside. The slit ejector unified engines would mix perfectly with the augmented air inside the duct. There would be several ejection points to maximize the fuel mixture efficiency. Inside the duct there would be Helmholtz resonators to reduce the noise and convert sound into heat. Turbulence inducing cavities to improve air mixture inside the duct without inducing too much drag. The heat inside the duct and the engine would be used to pressurize the liquid propellant, negating the need for turbopumps.

The outside of the duct is just a heat-resistant wall. Therefore, it can be directly attached to the fuselage without needing heavy support. Additionally, this design allows much longer ducts than turbofans that allows much better hot and cold gas mixture. More importantly, fuel rich exhaust gas can be completely burned out by the ambient oxygen by an afterburner effect. This reduces the LOX requirement for the journey.

The long duct would be placed between the frontal and the rear wing sets. This would feed non turbulent air to the duct and the rear wings would be protected from the warm exhaust gasses.

One final adjustment to the design is the addition of carbon fiber fabric around the Actuated Skirt Doors. There would be a slight gap between the fabric and the belly of the plane. This setup would act as a Dynamic Plenum Formation, Thrust Augmentation & Air Entrainment, Integrated Ground-Effect "Skirt" and Aerodynamic Envelope Restoration (Cruise) for the aircraft. This would reduce the immense fuel consumption of VTOL by up to 30% with less than the weight of landing gears on a traditional plane.