I am currently trying to make a model helicopter. I have calculated lift generated by the blades and upward acceleration of the helicopter. However, I amn't very sure if my helicopter will fly or not. Is there a simulator in which you can test your own helicopter model? (It would be very nice of you if you could suggest a simulator that is compatible with a Mac).
RC Desk Pilot is a simple, free, open source RC simulator that has an aircraft editor where you can create your own models, or modify an existing model.
If you really want to get into this, X-Plane is a popular open source simulator for full-size aircraft. It's super detailed. Just looking though the overview of the plane design tool is quite daunting!
A quick search does not show anything on the Mac except maybe some games.
Instead of a program built for a Mac how about an emulator instead? Wine provides a compatibility layer to run Windows software on MacOS.
A second option would be to install VirtualBox and then install a copy of Windows as a VM. This may be less performant since it only uses part of the processor / memory.