How does it change from FPP to CPP system?

The ship-simulator program we are using at this moment is by default a propeller of Fixed Pitch system (FPP) a new development is necessary to make an option for Controllable Pitch Propeller (CPP) as our client is requesting a passenger ferry vessel with two CPP can be able to be simulated in our simulator program and at the end to determine the safety of the vessel maneuvering on the area (small island).

CPP are to enhance maneuvering capabilities of the vessel especially on stopping and steering which is very important for a passenger ferry vessel maneuvers on an island. The problem to be solved here is how to modify the default program which is FPP to become CPP? At first I was concern on the efficiency of the propeller, as we change the pitch of the propeller, the torque and thrust coefficients with respect to the water flow around the propeller are also changing, which are quite a calculations and programming things to do. How can I get the optimum efficiency of the propeller every time we change the pitch?
Luckily, it was not as difficult as I think it would be. After a long discussion with a former and a very experienced pilot, a nice solutions is agreed. According to the experienced pilot I don’t have to determine the thrust and torque coefficients every time the pitch is change. Our software is already good enough to present a maneuvering characteristics for a passenger ship, what I need to change or modify is just the ‘time delay engine’ on our system. In this way it is sufficient enough to call the propeller system we use is now Controllable Pitch propeller.
Lesson of the day: Sometimes everything is not as difficult as it seems. Sometimes what it seems to be difficult things in theoretical point of view, actually can be easily solved by another approach by an experienced people, who can looks problem from the ‘other side’.