1. 8th Grade Technology

2. I Can… Describe the problem solving process
Present my ideas and communicate through drawing.
2 dimensional drawings
3 dimensional drawings
Orthographic drawings
Line types
Sketches
Thumbnail
Rough
Final
Design my CO2 dragster with certain engineering aspects in mind.
Understand how aerodynamics effects my designs.
Aero-efficiency

3. Problem Solving Process
Identify and define the problem
Set goals and Identify criteria
Generate alternatives Consider Limitations
Select Optimal solution
Implement the solution
Evaluate and modify
To design a new product, the designer and engineer follow the same basic steps.
Some steps may be used more often than others. It depends on which steps or design tools will best solve the problem.

4. Types of Drawings
Two Dimensional
Sketches
Three Dimensional

5. Sketches

6. Two Dimensional Length and breadth but no depth. Flat
The ability to view objects from different sides is a part of an area of geometry
called Spatial Visualization. The skill of visualizing objects spatially is
important to many fields of study, including dentistry, architecture,
construction, the arts, auto design as well as many other designing and
technology fields.

7. Three Dimensional
Appearing to have length, breadth, and depth.
Solid

8. TOP VIEW Front VIEW SIDE VIEW
When you peel the shape apart and draw certain views you begin to draw orthographically.
Have students come to the board to draw views.

9. Orthographic Drawing in which the projection lines are parallel.
The aim of an engineering drawing is to convey all the necessary information of how to make the part to the manufacturing department. For most parts, the information cannot be conveyed in a single view. Rather than using several sheets of paper with different views of the part, several views can be combined on a single drawing using one of the two available projection systems, first angle, and third angle projection.

10. Show students a block and compare sides.
Discuss dimensions.
Discuss different types of lines

11. Line Types
Visible Line
Hidden Line
Center Line

12. Product Engineering and Design Too Heavy Too Light VS. Fall apart
Stay together
Engineering involves predicting the future behavior of a material, or system. Engineers base predictions on known facts, mathematics, and science principles.
Product Engineering – means figuring out ahead of time whether a product will be strong enough and work as it should. There are many things to consider, and every detail has to be planned carefully.
Maximized Design
Thrown together

13. Mockups Paste-up Shows general size and shape Rough Idea
Appearance mock-up
Cardboard, clay, plastic, wood ect.
Looks like product
No working parts
The CO2 dragster is a mock-up of the real designs. No working engines or pulleys.
Try to design your car so that it could evolve into a real car.
Hard Mock-up
Most parts work
Major parts are not included

14. Prototypes http://www.conceptcarz.com/ Working Model Testing
Design changes

15. Aerodynamics Thrust Gravity Drag
The scientific study of how air interacts with moving objects.
Thrust
Once the prototypes are made testing can take place. Some of the testing done on cars relates to how well air moves around it. Forces such as gravity, thrust and drag are important in design.
Gravity
Drag

16. Drag Coefficient The aero-efficiency of any shape can be calculated.
The lower the CD value the more aerodynamic the moving object.

17. Students should look for the lowest Drag Coefficient in their design.

18. References
Huth, Mark W. Construction Technology. Glencoe/McGraw-Hill. IL: Peoria, 1997.
Fales, Sheets, Mervich, and Dinan. Manufacturing a Basic Text. Glencoe/McGraw-Hill. IL: Peoria, 1986.
Fales, Kuetemeyer, and Brusic. Technology Today and Tomorrow. Glencoe Publishing Company. California: Mission Hills, 1988.