Chiral liquid crystal phases have been attracting great interest in the past years because of their unique optical properties, such as: selective light reflection, optical dichroizm, ferro- and antiferroelectric behavior. One of the most popular ways of obtaining such materials is an addition of chiral dopants with high helical twisting power to the achiral liquid crystal mixtures. The aim of this paper is to investigate the dependence of helical twisting power on the spacer length and fluorosubstitution in recently prepared chiral three-ring esters with perfluorinated alkanoyloxy unit in a terminal chain.