1991 Toyota 91C-V Group C

 
Reference: wind tunnel data sheet, August 20-25, 1990, Dome wind tunnel
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.

Downforce:
2621 lbs. @ 150 mph, with 577 lbs. of drag
3774 lbs. @ 180 mph, with 831 lbs. of drag
4659 lbs. @ 200 mph, with 1026 lbs. of drag

Lift-to-drag ratio: 4.54:1


This test was intended to produce improvements to the 91C-V.  The primary areas of development were: outboard nose shape, nose top shape over the radiator, upper surface shape betwen the front and rear wheels, extension of the bodywork trailing edge between the rear wheels, side splitter area and shape between the front and rear wheels, rear wheel covers, rear wing position.

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:

Downforce:
3013 lbs. @ 150 mph, with 595 lbs. of drag
4338 lbs. @ 180 mph, with 856 lbs. of drag
5356 lbs. @ 200 mph, with 1057 lbs. of drag

Lift-to-drag ratio: 5.07:1


ęCopyright 2017, Michael J. Fuller