Efficiency of Jet Propulsion
Jet propulsion efficiency of a ship can be maximized under certain conditions. When the ship's inlet origins are at a right angle to the direction of motion of the ship, the efficiency can be determined using the following factors:

1. Nozzle Design:
The design of the nozzle plays a crucial role in determining the efficiency of jet propulsion. A well-designed nozzle will help in maximizing the thrust generated by the propulsion system.

2. Inlet Area:
The inlet area of the propulsion system should be designed in such a way that it allows maximum air intake for combustion. This will ensure that the propulsion system operates at its optimum efficiency.

3. Alignment of Inlet Origins:
When the inlet origins are at a right angle to the direction of motion of the ship, it allows for a more direct flow of air into the propulsion system. This alignment reduces any potential obstructions and helps in maximizing the efficiency of jet propulsion.

4. Thrust to Weight Ratio:
The thrust to weight ratio of the propulsion system should be optimized to ensure that the ship can achieve maximum speed with minimal fuel consumption. This will help in maximizing the efficiency of the jet propulsion system.
In conclusion, by considering factors such as nozzle design, inlet area, alignment of inlet origins, and thrust to weight ratio, the efficiency of jet propulsion of a ship with inlet origins at right angles to the direction of motion can be maximized.