|Model Specification: 1/5 scale, 220 mm splitter, double-element, 450 mm chord, 90C-V wing, no rear wheel covers.
45 mm FRH, 65 RRH, 1.55 m^2 frontal area. 25 m/s test speed. This is the standard car configuration per a specification determined on August 3, 1990.
Lift-to-drag ratio: 4.54:1
The model specification changed to this after optimization:
125 mm splitter, double-element, 450 mm chord, 90C-V wing, wing position Type B (95 mm rearwards, 50 mm lower), rear wheel covers fitted, 90 mm body trailing edge extension.
45 mm FRH, 65 RRH, 1.55 m^2 frontal area,
The optimized configuration produced these results. I'm uncertain if the 91C-V ever raced as configured:
Lift-to-drag ratio: 5.07:1