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October 20, 2014
 School AdmnStaff DirectoryAmbro7th Grade Applied STEM     
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7th Grade Applied STEM; Periods 5 & 6

CO2 Car Section One Notes

CO2 Powered Race Car

 

Section One:  The Design Process

 

A.  Thumbnail Sketches- small simple sketches that help you get ideas for your design

1.     Eight (8) designs, profiles of cars, must fit onto a sheet of notebook paper

2.    Multi-View drawing- can better define the shape

a.     Side view- profile of the car

b.     Top view- how the car looks from the top, looking down on it

c.     Front view- how the front end of the car looks

d.     Rear view- how the back end of the car looks

3.    Only general details are required, does not need to be a masterpiece, keep them simple

4.    Choose only your best thumbnail for your multi-view and Final drawings

B. Final Drawings- final working drawings, blue prints. To be completed on the paper Mr. Ambro provides

1.     Full sized drawings based on the standard sized, wedge shaped, race car blank

a.     12 inches over all length

b.     1 ½  inches wide

c.     2 5/8 inches high at rear end

d.     ¾ inch high at front end

 

2.    Drawings must be full scale, life sized, showing all details in exact dimensions.

a.     Location of the axels is to be ¼ inch from the bottom of the block and in from each end according to your plans

b.     Location of the CO2 cartridge hole is to be centered ¾ inch in from each side and 1 inch up from the bottom of the block.

c.     Show true wheel size and placement (ghost them in)

1)    Rear Wheels are     1 9/16”  Outside Diameter

2)   Front Wheels are    1 7/16”  Outside Diameter

d.     Show placement of screw eyes in the bottom of the car, down the center line of the car, before the front wheel and behind the rear wheel.

e.     Show any and all other details such as scoops, cockpit, windows, fenders, etc.

 

 

 

 

Rocket Design Criteria Notes

Rocket Design Criteria

 

     The following Design Criteria are based on the most efficient design giving the best performance and distance to the rocket.

 

I.             Rocket-Not a true Rocket, not self propelled

A.      Propulsion – what makes the rocket go

1.   Fired from a compressed air launcher

2.   Uses 60 psi (pounds per square inch) air pressure

3.   No guidance system, it is a projectile

B.       Physics –the science of motion

1.   Things that effect the flight of the rocket

a.      friction with the air – Drag

b.      Gravity-  what goes up must come down  (except 17000mph)

2.   Causes the flight –Newton’s 3rd  Law of motion  (For every action there is an equal and opposite reaction

 

II.           Parts and Components- the various pieces that are assembled to make up the rocket

A.      Core Launch Tube- the piece that fits onto the launcher and holds all the air pressure

1.   made out of construction paper, masking tape, cardboard, glue stick and yellow aliphatic glue

2.   18” long maximum (length of construction paper)

B.       Fuselage-the “body” of the rocket

1.   must fit over the CLT

2.   can be anything (almost)  NO METAL

3.   does not need to cover the entire CLT

C.       Nosecone –the pointy end

1.   help to penetrate the air- aerodynamic

2.   I will give Urethane Foam

3.   Students cover is with water putty for hardness and strength

4.   If you want something else student supplies: balsa wood, preformed plastic

D.      Fins- stabilizing elements to control flight

1.   Sheet styrene, supplied by instructor

2.   Large enough to interact with the air, small enough not to steer rocket

3.   Can be bent to cause rocket to spin

III.        Design Factors – limits and optimums

A.      Size –overall size and diameters

1.   Weight comes with size, too big, too heavy, too small not enough acceleration

2.   Too large a diameter and too much drag, too small and it won’t fit on launcher

B.       Weight- coupled with drag on launcher it may 

  Not launch

1.   Too much and thrust will not overcome it

2.   Too little no inertia, the feather effect

 

C.       Balance-where the center of balance is placed

1.   Too far forward and it will nose over

2.   Too far back and the back will out accelerate the front, tumble,

IV.          Materials

A.      Core Launch Tube

1.   Construction paper

2.   Masking tape

3.   Glue stick

4.   Cardboard

5.   Yellow aliphatic glue, woodworker’s glue

B.       Fuselage

1.   Anything but metal and glass

2.   Does not need to be a cylinder

C.       Nosecone

1.   Urethane Foam

2.   Water putty- hard protective surface

3.   Balsa Wood- hard to find, expensive

4.   Preformed plastic piece

D.      Fins

1.   Sheet Styrene – easy to cut and form

 

2.   Any material but no “sharp- blade like” materials.

 

 

 As of 1/28/2014

Homework is to get a parent of guardian's signature on the Class Rules. This is worth 10 points on day one of return (1/29) and loss of a point for everyday not returned

 

 

 
SECTION TWO: Construction of the RACE CAR
 
A.   Detail layout- transfer all measurements from final drawings to the body blank- place drawings in folder to be photo copied
1.      Layout locations of the axel holes
2.     Layout location of the CO2 cartridge hole
3.     Layout the locations of the Screw Eyes
B.   Drill all holes- before any cutting or shaping begins
1.      Axel holes- use small drill press
a.      Install the 5/32” drill bit into the chuck, tighten   with chuck key
b.      Clamp body blank to table in proper location
c.      Drill all the way through the car blank
d.     Don’t chip out the bottom side of the block when breaking through the bottom of the hole
2.     CO2 cartridge hole- use large drill press and drilling jig
a.     Use the ¾” drill bit- leave it installed in the chuck
b.     Place the car blank into the drilling jig
c.     Clamp the drilling jig onto drill table with C-clamps
d.     Drill CO2 cartridge hole 1 ½” deep
e.     Breakdown set-up and remove car blank from jig
 
C.   Shape body blank to desired design
1.      Mount the copied drawings to the body blank with glue stick
2.     Use the band saw to cut profile shape
3.     Re-adjust band saw guides and cut top shape
4.     Use belt sander to sand to rough finished shape
5.     Use Detailing tools ( chisels, files, gouges, Dremel tool) for any finish details (cockpit, windows, scoops, etc.)
6.     Hand sand to finished shape and smoothness
a.     Use all abrasives in proper order
b.     60 grit
c.     100 grit
d.     150 grit
e.     220 grit
f.     Have Mr. Ambro check between each grit
D.   Apply desired finish to finished car body
1.      All spray painting MUST be done in spray booth
a.      ONLY BASIC COLORS will be available
b.      Special colors must be provided by students
c.      Use only painting spuds for spray painting
2.     Detail and other brush paints will be provided by the student, along with brushes and thinner for cleaning
a.      Brush painting is to be done at the work benches
b.      All brush painting MUST be done on news paper
3.     Stickers and decals can be applied after the car is completely dry (supplied by students)
E.   Install axels and wheels
1.      Get your choice of wheels (2 front, 2 rear), axels, washers and eye screws from Mr. Ambro
2.     Measure axels for proper length and have Mr. Ambro cut to proper length (if necessary)
3.     Insert axel in to wheel hub
4.     Slip on washer
5.     Slide assembly through proper hole in car body
6.     Slip on opposite side washer over axel
7.     Mount opposite side wheel to axel
8.     Repeat 3 – 7 for other axel and wheels
F.   Install eye screws in bottom of car
1.      Modify eye screws to accept the monofilament line
2.    Make hole for eye screw with scratch awl in proper location ( down center line, before and after axels)
3.    Screw eye screw into the hole in bottom of car
4.    Make sure that eye screw is at right angle to center line
5.    Test car on monofilament stand.
 

Due date for cars and Race Day for those not racing on Thursday 1/24 will be on Thursday 1/24 and racing will take place during class time.

1/8/13  Begining work on CO2 Car Project.  Complete Section ONE - Design Work by Tuesday 5/22  COMPLETE Final Drawing by Wednesday 5/23  Plan of Procedure and Final Drawing whould be completed by Thursday 5/24  .  Start work on actual car on Friday 5/25

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