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Consensus Consulting Consensus Consulting Corporation Corporation

The Catapult Project The Catapult Project

Objectives Objectives

• Engineer and construct a device that will:

Engineer and construct a device that will:

• Launch a 50 gram golf ball a distance of three meters

Launch a 50 gram golf ball a distance of three meters

• Be no more than 1.5 cubic feet in size

Be no more than 1.5 cubic feet in size

• No Mechanical Devices for launching the projectile

No Mechanical Devices for launching the projectile

• Be consistently accurate enough to repeatedly strike a

Be consistently accurate enough to repeatedly strike a target with a bulls eye 3 inches in diameter, 20.5 target with a bulls eye 3 inches in diameter, 20.5 inches off the ground inches off the ground

Personal Objectives Personal Objectives

• Cost Efficient

Cost Efficient

• Safety

Safety

• Small Size

Small Size

• Accurate and Adjustable

Accurate and Adjustable

• Originality

Originality

• Aesthetics

Aesthetics

Planning and Brainstorming Planning and Brainstorming

• Trebuchet

Trebuchet

• Pros

Pros

• Very simple

Very simple

• Powered by only

Powered by only gravity gravity

• Sling design allows

Sling design allows for more accuracy for more accuracy

• Cons

Cons

• Design not efficient

Design not efficient under size under size restrictions restrictions

• Lack of trigger

Lack of trigger mechanism mechanism

Planning and Brainstorming Planning and Brainstorming

Planning and Brainstorming Planning and Brainstorming

• Catapult

Catapult

• Pros

Pros

• Consistent power source

Consistent power source

• Better trigger

Better trigger mechanism mechanism

• Easier to build

Easier to build

• Simple design

Simple design

• Cons

Cons

• Requires more weight

Requires more weight for stability for stability

• Spring may lose tension

Spring may lose tension

Planning and Brainstorming Planning and Brainstorming

First Prototypes and Testing First Prototypes and Testing

• Trebuchet

Trebuchet (Discontinued) (Discontinued)

• Design flaws

Design flaws

• Fulcrum could not be of

Fulcrum could not be of sufficient length to produce sufficient length to produce enough force enough force

• Counterweight could not be

Counterweight could not be large enough to fit within large enough to fit within the size constraints the size constraints

• Design perks

Design perks

• Sling for added power and

Sling for added power and accuracy accuracy

• Learning experience

Learning experience

First Prototypes and Testing First Prototypes and Testing

• Catapult

Catapult

• Design flaws

Design flaws

• Spring could not fully

Spring could not fully compress compress

• Projectile not secure

Projectile not secure

• Arm obstructed projectile

Arm obstructed projectile

• Improperly placed trigger

Improperly placed trigger

• Inaccurate aim

Inaccurate aim

• Design perks

Design perks

• Adjustable Trigger

Adjustable Trigger

• Powerful spring

Powerful spring

• Small Size

Small Size

• Learning experience

Learning experience

First Revisions First Revisions

• Combined Best

Combined Best Previous Designs Previous Designs

• Spring and Sling

Spring and Sling

• Using the spring loaded

Using the spring loaded catapult as a base, we catapult as a base, we added a sling similar to added a sling similar to the trebuchet’s the trebuchet’s

• Designed a different

Designed a different arm to better arm to better accommodate the sling accommodate the sling

First Revisions First Revisions

• Spring and Sling

Spring and Sling

• Sling release point

Sling release point

• Other Additions

Other Additions

• Duct tape to bottom

Duct tape to bottom

First Prototype and Testing First Prototype and Testing

Personal Testing Personal Testing

• Pouch stabilized

Pouch stabilized

• Notch 1

Notch 1 – – Hit top of door frame Hit top of door frame

• Notch 2

Notch 2 – – Hit ceiling Hit ceiling

• Notch 3

Notch 3 – – Hit ceiling higher Hit ceiling higher

• Conclusions:

Conclusions:

• Greater the power with the pin in the same position, the ball

Greater the power with the pin in the same position, the ball will be thrown higher will be thrown higher

• With pouch stabilized, accuracy is more consistent

With pouch stabilized, accuracy is more consistent

• The further the pin is angled at 90 degrees, the more the ball

The further the pin is angled at 90 degrees, the more the ball will shoot higher. The smaller the angle of the pin, the more will shoot higher. The smaller the angle of the pin, the more the ball will be thrown down. the ball will be thrown down.

Testing Testing

Testing In Class Prototype Testing In Class Prototype

Prototype testing 11/7/02 Prototype testing 11/7/02

Shot Shot position to Bulls Eye position to Bulls Eye Pin level Pin level

1. 1.

80 pts 80 pts High to the left High to the left 3 3

2. 2.

90 pts 90 pts Slightly to the left Slightly to the left 1 1

3. 3.

100 pts 100 pts Bulls eye Bulls eye 1 1

4. 4.

100 pts 100 pts Bulls eye Bulls eye 1 1

• Shot #1 = Default

Shot #1 = Default

• Total 290 pts

Total 290 pts

• Current ranking 1

Current ranking 1st

st out of 8

• ut of 8

Final Revisions Final Revisions

• Stabilized Pouch

Stabilized Pouch

• Greater accuracy

Greater accuracy

• Aiming Mechanism

Aiming Mechanism and Trigger and Trigger Combination Combination

• Aesthetics

Aesthetics

• Stained

Stained

Results and Conclusions Results and Conclusions

• Materials Used

Materials Used

• 1 Eyehook

1 Eyehook

• 1 Paneling Nail

1 Paneling Nail

• ½ Car Fender Clip

½ Car Fender Clip

• 2 Inch Coter Shaft

2 Inch Coter Shaft

• 1 Coter Pin

1 Coter Pin

• 4 L

4 L-

• brackets

brackets

• 1 Door Hinge

1 Door Hinge

• 1 Metal Plate

1 Metal Plate

• 29 Screws (Variable

29 Screws (Variable Sizes)

• 11 Staples

11 Staples

• 1 Air Pump Spring

1 Air Pump Spring

• 10 inches of String

10 inches of String

• 1.5 Ft³ Camo Fabric

1.5 Ft³ Camo Fabric

• 3 Inch Metal Shaft

3 Inch Metal Shaft

• Approximately 2

Approximately 2 Board Feet of Pine Board Feet of Pine

• Total Cost

Total Cost

• Estimated $13.87

Estimated $13.87 Sizes)