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CO2 Dragster Design Process

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by

Vincent Hreszczuk

on 24 October 2014

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Transcript of CO2 Dragster Design Process

Introduction
In year 9 Engineering we started a new project looking specifically at CO2 cars and had to complete many stages in the making of these. We had to consider many principles including: Aerodynamics, Speed and Velocity, Weight, Strength, Newtons Laws of Motion, Gravity, Drag and Friction. These will be explored later in the presentation. Due to these key principles we had to come up with different design ideas- in doing this we had to design the fastest car as possible. This car had to be designed out of foam as a prototype and the final design out of Balsa wood. This project has gone for 7 weeks.
Specification Sheet
Design Brief
Solution
Making the Dragster
I took the idea that I liked best, improved it and drew a template onto the wood block.
Description of our CO2 Dragster:
Our mission: We will read over the criteria, research aerodynamics and CO2 dragster designs, brainstorm ideas (draw rough sketches) and draw out our best design. In pencil draw out the design on the block of foam and then wood begin using machinery to cut the shape.
CO2 Dragster Design Process
By: Vincent Hreszczuk
Research/ Idea Development
I researched the internet for various designs and drafted many rough designs on paper. I used those designs and
chose the one design that
we thought worked
best.
Type of CO2 Dragsters
Rail Cars
General Description
- Has a narrow "rail" that makes up most of the car.
- Has exterior wheels
Positive Aspects:
Negative Aspects:
- A typical design used by most students since it is simple and easy to build.
- The rail of the body of this car cuts off a lot of mass which increases the speed.
- If the rail part is made too thin there is
a possibility that it might break.
- The shape of a typical rail car often has negative effects on the aerodynamics. It also increases drag on the vehicle.
Shell Cars
General Description
- Hollow on the inside, thus the influencing the name "shell" car. The outside "shell" part is extremely thin.
- Its wheels are internal rather than external.
Positive Aspects:
Negative Aspects:
Positive Aspects:
Negative Aspects:
- Extremely light
- Has a very aerodynamic "bullet" design that greatly reduces drag.
- The "bullet" design tends to be the same through all shell cars allowing for little creativity in the designing process.
-Cutting out the car is extremely difficult since the shell is very thin.
- Design technologies like 3D-printers and CAD are required in making the car.
Show Cars
General Description
- Have amazing designs that reflects on individuals creativity
- Designs may be very detailed and paints are very flashy
- The car designs are atheistically pleasing.
- Allows creator to have full creative control with no restrictions.
- Some designs may be very aerodynamic.
- The car may also not be aerodynamic and be very heavy due to excessive amount of added parts.
- The dragster may not be able to register into competitions since it does not meet the parameters.
- Show cars may include special materials to add to the creativeness.
Aerodynamics
What are aerodynamics?
Aerodynamics is the study that deals with the motion of air and how it effects objects moving through the air.
The 1# factor to consider in designing is the fact that the lighter the dragster the faster it goes. Therefore we have to design our car to be as light as possible.
Drag
Drag is a force that opposes the object's motion through air. Drag is generated when an object is put in contact with a fluid such as air.
Since drag opposes the vehicle's motion how do I reduce the effects of drag?
Frontal Pressure Turbulence
is the pressure caused by air flowing around the front of the car.
is an unsteady movement of air. Turbulence occurs is where there is detachment of air
Factors of Drag
This can cause the car to have a shaky ride, which is bad in performance and speed.
If the air does not flow smoothly around the front this will cause more drag.
Examine the pressure and how it works against the direction the car is moving in, hence slowing it down.
Question: How to reduce drag?
The air flow becomes distorted as it moves around the object.
Answer:
Make the dragster streamline so the air moves more smoothly around it, which allows for speed and a smooth ride.
Mass
Friction
Understanding Principles
Friction on the Dragster
Friction occurs between:
The wheels and floor
The axles and side of the car
The hooks and the fishing line
Friction can cause the car to move slower as surfaces are rubbed against each other generating unnecessary heat rather than speed.
Question: How to reduce friction?
Answer:
Drawing Prototypes
Ensure enough room for the wheels to rotate smoothly.
Properly align the hooks.
*Fair amount of friction is needed on the wheels and ground to make for good traction.
Wheels and ground
Hooks
Axles and car surface
Design I chose
Step 2:
Step 3:
Step 4:
I used the bandsaw to cut out the exterior shape of the dragster and sanded its edges so they were fileted/ smooth .
Step 5:
Using the drill press I drilled holes in areas that were to be hollow.
Step 1:
(Realization)
I painted the base coat, then added details and finishing touches. Waited for the base to dry before adding on more paint.
Base Paint: White
Other Paints: Green and Orange
With the belt/disc sander and a filer, I sanded the inside and the outside of our car, in order to get rid of excess wood and reduce the mass.
Orthographic & Isometric Drawings
How will I achieve the fastest time possible?
What are the factors that will make the car slower, how would we reduce/ prevent these factors?
What are the factors that will make the car faster, how do we enhance these factors?
I Had To Think About
Description:
Details:
My CO2 car best conforms to the "rail car" design most typical of student-made dragsters. However, I used some aspects of shell and show cars to make the design more aerodynamic and aesthetically pleasing. The basic shape of the dragster has a thin "rail" connecting the front and back wheels. To reduce mass, I made some parts of the car thinner; inducing the shell aspect.
Materials:
Function:
Features:
Creativity:
12 inch wooden block with the CO2 hole already drilled in.
Plastic wheels and metal axles.
Paints and paint brushes
The function of a CO2 dragster is to race. The purpose of my dragster is to be the fastest and most aesthetically pleasing car in the race.
Thin, hollow rail.
Approximate mass is 37grams
The logo for my car is "Sahara Racing"
Making this car took a lot of careful cutting and sanding.
The design has aspects from 3 different types of dragsters.
Then using the drill press, I made holes where the axles are located.
I made sure to use relief cuts so there won't be intensive stress on the band that might cause it to break.
I adjusted the stopper so the drill would go all the way through. I used various sized drills depending on how hollow we wanted an area to be.
Evaluation:
Self- Evaluation
Criteria:
MY Dragster:
Design Brief:
I achieved the mission, following the design brief and meeting all of the specified criteria. The dragster was cut, drilled, sanded and was completed as scheduled.
The End
Done in Exam
Criteria Analyze
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