Please Recommend Software Programs for Design and Flight Simulation

Hi Community

I’m looking for software to design and conduct flight simulations for a nano UAV, helicopter type (black Hornet). I have looked at open-source software programs, such as FlightGear, ODM, and UAVPROF, commonly used for mission planning or simulation. I’m looking for a software program that can be used to determine performance parameters such as flight duration, stability, COG, etc. Hence, be able to iterate or optimise the design.

I’m looking forward to your inputs.

Best,