horlick97- There has been a substantial amount of effort put into performance simulations over the past 7-8 years in support of what is now the JMR program. Simulations were performed of every rotorcraft configuration you can imagine. Some of the simulation work was performed by companies participating in the program on their own proprietary designs, while other simulation work was performed by independent groups like NASA based on generic designs they created.
Here is a
2007 performance simulation study conducted by a group from NASA & AMRDEC, which includes a 250kt, 150klb GTOW coaxial rotor concept and a 300kt, 139klb GTOW compound tandem rotor concept. The individuals responsible for the work (like Wayne Johnson) are well respected in the industry, so the results of this study do have some credibility.