Prototype Baja SAE UC 2015, Vehicle # 71. Reynaldo Tortolero, Edmig Moreno, Carlos Barragan, Jesús Moreno, Ricardo Sanchez, Eduardo Cebrian, Aaron Rodríguez, Wilmer Rodríguez, Luis Blanco, Alejandro García Universidad de Carabobo Daniel Cavero, Eva Monagas Faculty Advisors Copyright © 2007 SAE International ABSTRACT University of Carabobo, presents its fourth prototype in BAJA SAE OREGON 2015 competition, designed to fulfill the following objectives: a) To manufacture an economical vehicle, b) To optimize manufacturing processes, c) To improve power-weight ratio making a lighter vehicle, for obtaining a better performance. The prototype design contains six study areas: chassis-safety and ergonomics, suspension, transmission, brakes, steering and control systems (telemetry). The CAD / CAM software and studies to prototypes that participated in the previous competitions was used. INTRODUCTION For the prototype Baja SAE UC # 71 development, University of Carabobo Baja team focused on analyzing the previous vehicle designed performance and corrected the problems observed in BAJA SAE UTEP 2014 competition, which are: a) low average acceleration, b) skid plate damage during endurance, c) faulty suspension components, d) the judges observations regarding the optimization of the transmission system. The project objectives are focused to solve on the indicated problems, the materials and miscellaneous standardization, decreasing the vehicle components number, weight reduction, adjusting the vehicle dimensions and improvements to facilitate the vehicle adjustment to the pilot physical conditions ensuring his comfort throughout the development of each test. Each one of these requirements were applied to the 6 areas of study, also implementing a new electronic acquire data system to vehicle performance. FRAME Frame design goals:  To improve the chassis geometry and strength in different scenarios by impact analysis per action suspension system, rollover, frontal and side impacts.  To reduce weight by varying diameter and thickness of the corresponding tubing of side members and reinforcements. Design: The leading members were changed, changing welding points to bends in the tubes, providing greater stiffness to each member of the structure. The diameters and thicknesses of the side members and reinforcements are reduced, without affecting stress distribution and its structural rigidity, achieving a weight reduction of 35% over the previous prototype. Folds implemented in SIM member’s cockpit, which extend from the RRH to the FBM, to maintain comfort and reduce the pilot cabin longitudinal dimension. At the front is given a tilt angle of 12 ° to the horizontal to improve the operation of the steering and suspension of the previous prototype. FEA analysis were made to evaluate the core member’s performance and distribute thicknesses of the side members and reinforcements, assessing conditions to which the vehicle structure will be subject by the action of the impacts of the suspension, frontal impacts, impacts side, rollover, etc. Material selection is based on the following analysis: a) frontal impact with a load of 5000 N (see Figure 1), b) side impact with a load of 5000 N (see Figure 2), c) rollover, considering the fall of the vehicle with a mass of 250 kg (including pilot mass) to a deceleration of 2g, with load applied on one of the FBM, d) torsion with 5000 N impact loads applied to anchorage points of the dampers front and rear (see Figure 3). Material selection: Based on the FEA analysis results and the standard minimum specifications, the materials prototype chassis # 71 are AISI 4130 standard for all major, minor and reinforcement members, as this material has flexural rigidity and a bending peak better than AISI 1018 steel, considering the comparison between the bending strength between both materials through inertia ratio with the distance from the tube center to the outermost fiber and the strength of the material [1]. The core members have a diameter of 1.25 "x 0,065" thick, minor members and some reinforcements are 1 "x0.065" and 1 "x0.049", other reinforcements are 0.875 "x0,035". Manufacturing: To manufacture the chassis, the GTAW welding method was implemented, using a filler ER 70-S