C-Ms are collaboration of very simple and practical scientific principle and mechanical concept that led to the invention of the following powerful machines: C-M1 and C-M87 – the hydroelectric power generating machine through water recycling concept, C-M2 – the flying machine and C-M3 – the engine replacement machine.  Both C-M2 and C-M3 are compact versions of C-Ms. C-Ms are different from the principles and concepts of known Perpetual Motion Machines and Conventional Prime Movers namely: fossil-fuel-based engines, nuclear, and nature’s prime movers, which all have drawbacks.