Auxiliary Power/Tanks (orig. equip.)
Based on a successful IOR 1/2 ton design, a number of different versions of the RUSH 31 were available besides the basic model with various performance enhancements: The GTE, REGATTA which had a lead keel, and the ROYAL. (The RUSH ROYAL STD was a selection for the 'Tour de France à la voile' 1982-1983.) In the US a boat based on this hull design was built under licence as the CAL 9.2.