Consensus Consulting Consensus Consulting Corporation Corporation - PowerPoint PPT Presentation

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 – – Hit ceiling Hit ceiling Notch 2 � � Notch 3 – – Hit ceiling higher Hit ceiling higher Notch 3 � � 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 position to Bulls Eye Pin level Shot position to Bulls Eye Pin level 80 pts 80 pts High to the left High to the left 3 3 1. 1. 90 pts Slightly to the left 1 90 pts Slightly to the left 1 2. 2. 100 pts Bulls eye 1 100 pts Bulls eye 1 3. 3. 100 pts Bulls eye 1 100 pts Bulls eye 1 4. 4. • Shot #1 = Default • Shot #1 = Default • Total 290 pts • Total 290 pts st out of 8 • Current ranking 1 st out of 8 • Current ranking 1

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 • 11 Staples 11 Staples • � • 1 Air Pump Spring 1 Air Pump Spring • • 1 Eyehook 1 Eyehook • • 10 inches of String 10 inches of String • • 1 Paneling Nail 1 Paneling Nail • • 1.5 Ft³ Camo Fabric 1.5 Ft³ Camo Fabric • • ½ Car Fender Clip ½ Car Fender Clip • • 3 Inch Metal Shaft 3 Inch Metal Shaft • • 2 Inch Coter Shaft 2 Inch Coter Shaft • • Approximately 2 Approximately 2 • • 1 Coter Pin 1 Coter Pin • Board Feet of Pine Board Feet of Pine • 4 L 4 L- -brackets brackets • • 1 Door Hinge 1 Door Hinge • � Total Cost Total Cost • 1 Metal Plate 1 Metal Plate • � • Estimated $13.87 Estimated $13.87 • • 29 Screws (Variable 29 Screws (Variable • Sizes) Sizes)