A Technical Note on Mechanical Architecture and Kinematic Constraints in a Roto-Dynamic Variable Compression Ratio (RVCR) Engine Concept

Rotary internal combustion architectures have historically promised mechanical simplicity but have struggled with sealing, combustion phasing, and durability under high compression ratios. This note examines the mechanical architecture and kinematic structure of a roto-dynamic variable compression ratio (RVCR) engine concept, in which compression, combustion, and expansion are governed through controlled kinematic sequencing and valving for gas exchange, rather than continuous chamber deformation. The intent is not to present performance claims, but to articulate the mechanical logic, kinematic constraints, and governing load paths of the system. Assumptions are stated explicitly, and conditions under which the architecture would face limitations are identified.