T R E B U C H E T
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Transcript of T R E B U C H E T
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T R E B U C H E T
A Semester-Long Engineering Project
By: ANDREW ALTON
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Why did I do this?
Pent up rageDestroying People/ThingsWeapons at schoolNothing better to do
on Mondays and Wednesdays anymore
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RESEARCH
Only few internet sites w/ worthwhile info“How-To” Websites:
www.trebuchet.com “A Treb” computer variables data
Data-Variables
Cool Simulation
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The BUILDEvery Monday and Wednesday
around 6-9 PMTools from home THE HOME DEPOTMr. Dohm reimburses me for the $200
I spent on materials
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The Start
Used old trebuchet(s) from last semesterUsed about 40% old materials, 60% new materialsBasic plan: Make the old trebuchet into one that works very well and launches a projectile
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Components of a Trebuchet
Long, very strong “Arm”Axles must not bendShould have wheelsCounterweight: heavy & compactSling launches projectile fartherTrigger safety first!
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The ARM
Triple 2X4 Triple 2X4 constructionconstruction
Holes must be bored perfectly level, so arm is plumb.
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Axles Cotter Pins Hold Arm from moving horizontally
More cotter pins so axle doesn’t come off supports
Screwing it together is easier
Axle Grease
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The Counterweight
First tried concreteThen looked all around for weightsHOME-DEPOT paving bricks:
Cheap & real HEAVY30 bricks X 5 lbs. ea.
=150 lbs.!!
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S l i n G
No pre-made slings; made it myselfSewing strap-strongerOne end of sling string is attached to trebuchet, the other is attached to a metal ring- slips off
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TriggerLaunch trebuchet from a safe distanceHeavy duty construction meant a safe launchAbout 100 lbs. of force
1. Slip metal ring attached to the arm over the trigger rod.
2. Stick a screwdriver shaft through eyebolts
3. Pull screwdriver out with an attached string
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Final ProductArm is strong and efficient
Outriggers keep trebuchet from wobbling
Swiveling wheels allow easier transportation
Center channel guides projectile
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Testing
First couple tests- trebuchet fell completely apartNext tests with bricks- bricks fell out of counterweight boxAdded blue tarp on counterweight box to keep bricks in Tried different projectiles: Water Balloons, Concrete Ball, Steel Shot-Put, Then a Large Rock.
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Movie Of Trebuchet Trial
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Second Movie of Testing
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MY FUTURE TREBUCHET
Counterweight:2 X 55 gal. Drums w/
Water = 990 lbs.Perfect for launching Underclassmen, preferably Froshes!Beware!…..