The following links might be of interest….
Wind tunnel and CFD investigation of unconventional rigs Abstract. This paper presents research activities carried out by the authors to investigate aerodynamic behaviour of several unconventional saiplans in comparison to the sloop traditional solution. In particular an “A- shaped” mast, placed in the stern area of the yacht has been considered in single-jib and double-jib configurations. Wind Tunnel tests and performance prediction analyses have been performed in order to compare different configurations.
Here is a little project I have been working on, converting a Nirvana RC sailboat to be aft masted.