Aerodynamics

Table of Contents:

Thumbnails and Sketch

Personal Car

Race Day

Research:

Construction:

The Sketch was extruded out in a mid-plane to form on each side of the sketch.

A guided spline was used with a loft to create a tear-drop shaped extrusion.

An extrusion was used to form the rear fenders on each side of the car.

An extrusion was used to create the front wheel standoff on each side of the car.

There was an extruded cut used to cut a hole in the back of the car to hold the cartridge.

This is the completed construction of the cartridge.

This is the wheel assembly with the front tire and front rim formed together.

This is the big wheel assembly with the back tire and back tire rim formed together.

This is the completed construction of the washer.

This is the complted construction of the axle piece.

Charts/Data:

All thin wheels chart

Large wheels in the back chart

All thin wheels data

Large wheels in the back data

Flow Simulation:

Image of the flow sim on all thin wheels car assembly

GIF of the flow sim on all thin wheels car assembly

Image of the flow sim on big back wheels car assembly

GIF of the flow sim on big back wheels car assembly

GIF of the flow sim of the all thin wheel car assembly with the cartridge.

Drawing:

Drawing of the car assembly

Personal Aerodynamic Car:

Thumbnails and Sketches:

The Initial sketch designs of the school bus.

SolidWorks Initial Designs:

The base of the car was extruded using midplane, allowing both sides of the sketch to be made.

There were fillets added to the front of the bus to make the front look like a bus.

The front grill esd extruded out, allowing for a cut to be made making the holes for the grill.

The guideline holes were made at the bottom of the bus in order for it to stay on the track using fishing line.

The windows were extruded out giving the bus a design.

This is the completed assembly of the bus with all of the components such as the wheels, axles, and washers.

This is a GIF of the completed bus assembly.

This is a GIF of the flow simulation for the bus assembly.

Initial Data:

This is the basic data regarding the Drag and Lift of the bus.

This is the chart showing the drag data of the bus.

This is the chart showing the lift data of the bus.

Modified Bus Sketches/Designs:

These are the initial sketches of the modifications for the bus.

There was a chamfer added to the top of the bus. This creates a slant to allow better air flow at the top of the bus.

There was a loft created on top of the car, allowing the air to flow across smoothly.

The grill was replaced by a hole in the front of the car. This will allow the car to flow through the front and up towards the top.

There was a ramp made at the from to allow the air to go up towards the front causing less drag.

This is the completed assembly of the modified bus.

This is a GIF of the modified bus in the flow simulation.

A sliced GIF of the bus in Prusa slicer, showing how the bus will be printed.

Modified Bus Data:

This is the data for the modified bus simulation after using the flow simulation. Compared to the original bus design, there was a decrease of 19p for lift and an increase of 30p drag.

The is the chart showing the progression of drag for the modified bus.

The is the chart showing the progression of lift for the modified bus.

Final Printed Car

These are the images of the fully assembled 3D print of the bus.

1st Race:

This is the picture of the bus about to race on a 60 foot track.

These are the times for the race, the bus time on the left finished in 6.472 seconds.

Gif of the cars during the race.

Gif of the cars crossing over the finish line.

2nd Race

Image of both of the cars for the send race day.

This is after the race with the times of each car, the bus did not cross the finish line.

3rd Race

This is the image of the cars for the 3rd race day.

This shows the times of each car with the bus getting a 7. 371 seconds.

This is a GIF of the start showing the cars taking off.

Math

This is the math showing the percent of decrease in drag when comparing the original bus model to the modified bus model.

This shows the top velocity of the bus for each race, with it reaching 17.21mph for the first race and 15.32mph for the 3rd race.

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