1989 First Tow bar for Tandem Flights In 1989, with a serious of injuries and deaths being linked to the double harness, manufacturers introduced a modified tow bar based on McCullohs 1971 and 1974 design. The new tow bar system allowed operators to connect multiple parasailors wearing a harness passenger support side-by-side similar to the Gondola. The tow bar aka "Tandem Bar" became popular with operators who wanted to fly multiple parasailors without investing into a larger parasail vessel and paying royalties associated with the patented Gondola. previous next