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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?. 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

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  1. T R E B U C H E T A Semester-Long Engineering Project By: ANDREW ALTON

  2. Why did I do this? • Pent up rage • Destroying People/Things • Weapons at school • Nothing better to do on Mondays and Wednesdays anymore

  3. RESEARCH Data-Variables • Only few internet sites w/ worthwhile info • “How-To” Websites: www.trebuchet.com “A Treb” computer variables  data Cool Simulation

  4. 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

  5. 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

  6. 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!

  7. The ARM Holes must be bored perfectly level, so arm is plumb. Triple 2X4 construction

  8. 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

  9. 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.!!

  10. 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

  11. 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

  12. Final Product • Arm is strong and efficient • Outriggers keep trebuchet from wobbling • Swiveling wheels allow easier transportation • Center channel guides projectile

  13. 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.

  14. Movie Of Trebuchet Trial

  15. Second Movie of Testing

  16. MY FUTURE TREBUCHET • Counterweight: 2 X 55 gal. Drums w/ Water = 990 lbs. • Perfect for launching Underclassmen, preferably Froshes! • Beware!…..

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