Multiplane Ramjet

I would like to propose an alternative supersonic passenger plane design that have multiple wings. There was only one supersonic passenger plane, Concorde. It had delta wings. Even though it has disadvantages, I am in favor of multiplane designs that have multiple wings.

Supersonic shock waves generate a lot of stress on the structures of the plane. Delta wing has a stronger wing design, that's why its preferred on supersonic planes. I propose three thin wings that are supported with small ram jets. Multiple wings have much higher lifting capability than delta wings and are strong. Distributed smaller engines generate thrust more evenly and have less stress on the structure of the plane.

Ram jets generate very low thrust at low speeds. In order to overcome this, I propose injection of liquid oxygen besides the fuel in the combustion zone. This would generate much higher thrust. Liquid oxygen injection would continue until the plane reach minimum efficient speed for the particular ram jet. The plane can be accelerated on the ground by the use of a catapult like in aircraft carriers. Coupled with liquid oxygen boost and large wing surface area, the plane would take off from a very short runway.

Multi wing design would allow the plane to fly at a higher altitude compared to Concorde. This would reduce the air drag even for a thin three wing design and may allow the plane to fly faster than Concorde.

The wings of the plane would be thin and wouldn’t allow fuel tanks inside. The fuel and the liquid oxygen would be stored in tanks at the back of the plane. This would reduce the usable space of the plane. Another alternative could be to store some of the fuel on tanks attached between the multi wings like extra fuel tanks of fighter jets. The plane can use RP1 as fuel like the rockets. Liquid oxygen would only be used on take off and partially on landing. Therefore, even a small amount of LOX is enough.