Moonies and Cymbals are important members of class V flextensional transducers. These devices, in general, consist of a piezoceramic disk poled in the thickness direction and sandwiched between two metal endcaps. Although the metal cap for a Moonie and Cymbal differ in shape, these metal caps contain a shallow cavity under their inner surface. When used as a projector, these metal caps act as mechanical transformers for converting and amplifying small radial displacement of the poled disk into large axial displacement normal to the surface of the caps. When acting as a sensor, the cavities allow a portion of the incident axial direction stress to be converted in to large radial and tangential stresses of opposite sign, thereby causing the d33 and d31 contributions of the piezoceramic to add together in the effective dh of the device. As the active element in these devices is ferroelectric as well as ferroelastic, it is proposed that the sensitivity of these devices can be improved and fine tuned by properly engineering the stress distribution in these devices. The driving force for this research is the idea of taking advantage of stress induced effects introduced in Rainbow actuators. E-mail : mnpm7@umr.edu