alwynhartman
This is the link to the online book Basic Helicopter Aerodynamics ~ by J. Sheldon.
Basic Helicopter Aerodynamics
The book gives the equations etc. for Momentum Theory and the more advanced Blade Element Theory.
This material will have to be entered into a spreadsheet or database for repetitive calculations. If you have and use Microsoft's Access Database, I can send you some forms and coding but they will need modification for use as a stand-alone program.
Hope that this is of some help.
Dave