FSAE Design Event Scoring (Some Insight into the Process) The first thing to understand is that the design events are scored according to the criteria. So is judging! This car would be worthless to try and drive competitively as it would have a ‘dead’ The FSAE car is a racecar purpose built for a prepared track, so performance and handling will be prioritized over smoothness and suspension travel. Recently I realized that changing the wheel offsets (or using spacers) to adjust the track width affects the scrub radius (a.k.a. Each graph represents an effect that will be experienced during various driving events, such as roll, heave, or turning. This paper also gives us information about various load transfers under breaking, acceleration & impacts. The scrub radius primarily affects the steering and Figure 8 - Diagram illustrating KPI and scrub radius 2 While caster, KPI, scrub radius, and mechanical trail are usually fixed once the suspension is designed, toe can be adjusted to add or remove straight line stabilizing effects. have to be kept in mind while designing and the best compromise for these values has to be found. performance during judging and scoring. Even solid axles have a scrub radius, it's just not really taken into account because it is moot. Looks like it'll have the power of the PM150 but it'll be smaller and lighter than the PM100. The larger the distance, the more effort is required to turn the wheel, as the tire has to “scrub” slightly to turn around the kingpin … (300 lb) car with very narrow, high pressure tires, at zero scrub radius, with zero KPI, and zero caster, lots of steering ratio, and the steering input force will be very small indeed, maybe as small as 1.3-2.7 Nm (1-2 ft.lb.). Rajendra Mane College SAE Team, … Major Component – Wheel Upright. The only useful thing it does is help the driver to detect pull under braking, which may indicate he's on a split mu. o Have peak loads been determined and designed for? Formula SAE is a student design competition organized by the SAE International. Scrub radius helps this feel by providing feedback from the contact patch. Although many metrics and details are reviewed ... king pin inclination scrub radius, bump steer, and other geometry/kinematics? Rajendra Mane College SAE Team, MH08 Racing [2] give formulas for load transfer, breaking force & torque. °Scrub Radius: With the scrub radius decreased from 33 to 20, a condition known as squirm will occur. This paper also gives us information about various load transfers under breaking, acceleration & impacts. FSAE Design Event Scoring (Some Insight into the Process) The design and developmental process of a FSAE car is a complex process. The design is weighed ... Scrub radius Toe angle . This is typical of FWD cars. which shows information about Caster, Camber, Scrub Radius & kingpin inclination. Scrub radius It is the distance between centre point of contact patch and point where the steering axis cut the ground, the fundamental reason to take scrub radius is to feel the ride on steering wheel, but it has a problem regarding the large scrub radius will tends to increase the wear of tyre, hence ... SAI and scrub radius. This creates a small tire/road friction resistance that in turn translates into feedback from the road. Furthermore, the kinematics of the suspension, such as roll centre height, track gain, camber gain, caster gain, Ackermann change with steering angle, roll steer and bump steer, also need to be verified. Scrub Radius. With a small amount of scrub radius, the tire is turned about the kingpin axis, slightly offset from the tire’s centerline. Budget Materials Cost = $322 Aluminum, Steel, Chromoly Tubing Parts Cost = $550 Bearings, Rod Ends, Spherical Joints, hardware Miscellaneous Costs = $100 Manufacturing Cost = ~$0.00 All fabricating was done by team in FSAE shop and student shop at no charge Total Cost = $972 Project Management The design of each component in the suspension assembly have been completed and optimized. The concept of FSAE is that each collegiate chapter assumes the role of a fictitious company who is set on building a prototype formula style race car. But ... inclination scrub radius, ump steer, and other geometry/kinematics? INTRODUCTION: Formula Student India-International Level Event, also known as FS-IND is a design competition which follows the standards of the prestigious Formula SAE/Formula … This clearance issues are probably why FSAE cars typically run high scrub radius' in the first place (although it does nice things for jacking). 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