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Super Kart REL 17Luis Melecio, Rodolfo Torres, Eduardo Olvera

Santa Rosa Junior College

Abstract For our project, we decided to design and build a Go-Kart. There are many different types of Go-karts, some electric and some gasoline powered. Each team member will have their own responsibility and contribution to the team. Responsibilities will consist of planning, designing, budgeting, physical construction, and presentation. We decided to use a relatively simple frame, making the overall built simpler and less expensive. We are using our combined knowledge of Math, Physics, and Engineering in order to apply them to our project. Applications of our knowledge include, power to weight ratio, gear ratios, top speed calculations, and overall design of the kart. Some challenges we encountered were dimensions of the frame, keeping cost low, and making sure all the parts fit with each other. Extensive time will be used on designing to insure parts will fit. Dimensioning will be done on Autodesk inventor to change variables until we agree on desired dimensions. We will attempt to keep cost down by budgeting inexpensive parts without sacrificing too much quality. Our final make project will result in a gas powered go kart that can successfully support and transport one driver. For the frame we decided to use 1 ¼” by 1 ¼” by ⅛” square tubing. The engine used was a Predator 6.5 HP 212cc OHV Horizontal Shaft Gas Engine with a theoretical top speed of 37.5 mph.

Introduction

Materials & Methods Results continued

Conclusion

Acknowledgements

According to our calculations, we were relatively close to our theoretical top speed. We managed to achieve a top speed of 28.5 mph compared to our theoretical top speed of 37.5 mph. After the go kart was finished, we learned how to cut metal, simple welding, and learned how to troubleshoot problems when necessary. Although building the go kart was not easy, we learned a lot that will aid us in our pathway towards our engineering careers.

• Designing, researching, and assembling of full frame and parts included:

- Rough sketch- Budget- Research- 3D model using Autodesk Inventor- Welding- Cutting- Assembly• Some adjustments had to be made as we

troubleshoted some calculations₋ Frame was wider than expected- Adjustments were made to accommodate

dimensions of real parts

Materials• 1 Steering wheel • 1 Steering shaft and hub kit• 1 Right and left spindle axle and bracket • Tie rod kit • 4 wheel bearings• 1 Throttle and brake cable • 1 Throttle and brake pedal • 1 6.5 HP 212cc Predator Engine• 1 Torque converter 0.75” clutch • 4 wheels and tires • 1 Axle bearing kit • 1 44” rear axle • 1 10 feet #40 roller chain • 1 brake disk • 1 brake caliper

Autodesk Inventor Frame design

• Frame was designed for simplicity and low costs

• Frame composed of rectangular shapes for a simple but strong structure

Frame

• Square Steel Tubing 1¼” x 1¼” x ⅛” by 4.0’ foot long.

• Tubing was cut into specific lengths and placed according to 3D design and welded together.

Engine and torque converter • The 212 cc predator engine generates 6.5 horsepower at 3,600 rpm.• We chose to apply a torque converter because it allows us to put power to the ground better. Achieving

faster acceleration while sacrificing a small amount of top speed. Our go kart has no transmission so the converter mimics a CVT (continuously variable transmission) which allows for a smoother acceleration.

The cornerstone of the build was the frame. Bearings were welded onto the frame in order to hold the live axle in place. The live axle bared the brake disk, sprocket, and wheels. Additional welding was needed to mount the steering axle, pedals, and spindles. The ground plate was sawed at the middle and drilled holes at every corner of the plate along the orientation of the three main support bars ensured strength and stability. The motor was bolted onto a smaller wood plate. The seat was then mounted on and steering wheel was adjusted according to the driving position.

•How It Works:

•1. The Engine is started by a manual means of recoil pull.

•2. The Engine has a horizontal shaft that is connected to the torque converter.

•3. The Torque converter allows smooth shifting action and automatic variation according to throttle input.

•4. A chain connects the clutch on the torque converter to the big sprocket causing it to rotate.

•5. The sprocket in turn causes the live axle to spin.

•6. The spinning live axle also turns the wheels thus putting power to the ground.

Results

• Baltazar Nunez for helping us with the welding, cutting of metal, drilling, and for letting us use his equipment.

• Darci Rosales- Project coordinator • SRCJ/MESA- funding

Larger sprocket allows for faster acceleration

Finished model on Autodesk Inventor