Project SC300 Road Racer: Part 35 – The Wang Gang is Splitting Up
by Erik Jacobs
It’s been a little while since I last penned (typed?) a Project SC300 update. But I have not been entirely idle. Life began to normalize, and a plan was formed to get to the track more often. A long time ago, we installed our Nine Lives Racing wing. And not that long after, Rob Lindsey from Morlind Engineering came by to take more scans of the car.
Because the front of the car is where a splitter goes. Following pretty much the same process as with the wing, the speckled dot photos are converted into a 3D model and then some basic CFD analysis is performed. Well, in the specific case of Project SC300, really no CFD analysis was done because the rules for NASA’s ST class are quite open. The NASA rulebook states:
“Aerodynamic devices and/or modifications may not protrude more than six (6”) inches from the vertical plane from the ground to the widest part of the right and left sides of the vehicle’s body. Front wing/spoiler/foil/splitter may not protrude more than 12 inches in front of the outermost edge of the front bodywork/fascia, and may not be higher than the lowest part of the vehicle’s hood.”
TWELVE INCHES? OK, well, we have something to work with.
The KBD bumper is flexible and wasn’t attached to the car, but the previous kit was gnarly fiberglass and held its shape. Rob took some measurements off it. The previous splitter was just a piece of ABS plastic that I hacked into shape and then pop-riveted into the bumper. It was pretty ghetto and was primarily there to act more as an undertray in an attempt to direct airflow through the radiator, as opposed to generating any appreciable downforce.
The measurements will be used to figure out the width of the splitter (related to the 6-inch outside-the-body limit), as well as its overall depth (related to the 12-inch limit), and where the end of the bumper is. Because of the way the rules are written, the splitter could have been designed as a giant one-piece combination splitter and undertray that went well behind the front axle. But a flat bottom isn’t necessarily the best aerodynamic solution, and we don’t have a full car scan for CFD, and that’s expensive. So, here we go.