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T R E B U C H E T. A Semester-Long Engineering Project By: ANDREW ALTON. Why did I do this?. Pent up rage Destroying People/Things Weapons at school Nothing better to do on Mondays and Wednesdays anymore. RESEARCH. Data-Variables.

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t r e b u c h e t

T R E B U C H E T

A Semester-Long

Engineering Project

By: ANDREW ALTON

why did i do this
Why did I do this?
  • Pent up rage
  • Destroying People/Things
  • Weapons at school
  • Nothing better to do

on Mondays and Wednesdays

anymore

research
RESEARCH

Data-Variables

  • Only few internet sites w/ worthwhile info
  • “How-To” Websites:

www.trebuchet.com

“A Treb” computer

variables  data

Cool Simulation

the b u i l d
The BUILD
  • Every Monday and Wednesday

around 6-9 PM

  • Tools from home
  • THE HOME DEPOT
  • Mr. Dohm reimburses me for the $200

I spent on materials

the start
The Start
  • Used old trebuchet(s) from last semester
  • Used about 40% old materials, 60% new materials
  • Basic plan: Make the old trebuchet into one that works very well and launches a projectile
components of a trebuchet
Components of a Trebuchet
  • Long, very strong “Arm”
  • Axles must not bend
  • Should have wheels
  • Counterweight: heavy & compact
  • Sling launches projectile farther
  • Trigger safety first!
the arm
The ARM

Holes must be bored perfectly level, so arm is plumb.

Triple 2X4 construction

axles
Axles

Axle Grease

Cotter Pins Hold Arm from moving horizontally

More cotter pins so axle doesn’t come off supports

Screwing it together is easier

the counterweight
The Counterweight
  • First tried concrete
  • Then looked all around for weights
  • HOME-DEPOT paving bricks:

Cheap & real HEAVY

  • 30 bricks X 5 lbs. ea.

=150 lbs.!!

s l i n g
S l i n G
  • No pre-made slings; made it myself
  • Sewing strap-stronger
  • One end of sling string is attached to trebuchet, the other is attached to a metal ring- slips off
trigger
Trigger

Launch trebuchet from a safe distance

Heavy duty construction meant a safe launch

About 100 lbs. of force

Slip metal ring attached to the arm over the trigger rod.

Stick a screwdriver shaft through eyebolts

Pull screwdriver out with an attached string

final product
Final Product
  • Arm is strong and efficient
  • Outriggers keep trebuchet from wobbling
  • Swiveling wheels allow easier transportation
  • Center channel guides projectile
testing
Testing
  • First couple tests- trebuchet fell completely apart
  • Next tests with bricks- bricks fell out of counterweight box
  • Added blue tarp on counterweight box to keep bricks in
  • Tried different projectiles: Water Balloons, Concrete Ball, Steel Shot-Put, Then a Large Rock.
my future trebuchet
MY FUTURE TREBUCHET
  • Counterweight:

2 X 55 gal. Drums w/ Water = 990 lbs.

  • Perfect for launching Underclassmen, preferably Froshes!
  • Beware!…..
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