Create a trebuchet that is able to launch a 1ft boulder

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SUMMARY

The discussion centers on constructing a trebuchet capable of launching a 1ft boulder weighing approximately 120-140 lbs over a distance of 100 yards. The initial design utilized three 80 lbs bags of cement as counterweights, which was later deemed insufficient. The user revised the plan to incorporate two or more 55-gallon water drums, totaling around 416 kg of counterweight. However, further calculations indicated that this setup may still lack the necessary force to achieve the desired launch distance, prompting inquiries about alternative methods to increase force without solely relying on counterweight adjustments.

PREREQUISITES
  • Understanding of trebuchet mechanics and design principles
  • Basic knowledge of physics, particularly projectile motion
  • Familiarity with weight distribution and counterweight calculations
  • Experience with materials suitable for constructing large-scale trebuchets
NEXT STEPS
  • Research advanced trebuchet design techniques, focusing on optimal counterweight configurations
  • Explore the physics of projectile motion to calculate required force for specific distances
  • Investigate alternative counterweight materials and their impact on trebuchet performance
  • Learn about sling design and its effect on projectile launch efficiency
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and educators interested in mechanical engineering, physics applications, and large-scale project construction, particularly those focused on trebuchet design and optimization.

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I am attempting to create a trebuchet that is able to launch a 1ft boulder (approximately) 100 yds using a trebuchet mechanism.

My current idea is basically to use three 80 lbs bags of cement as the counterwieght and use a sling system at the end of the arm as the launching component.

On to the reason of my post: Do any of you have suggestions that might make this attempt easier? Mind you, this isn't a homwork project. It is slightly related to a tiny trebuchet we are making, but this is, first and foremost, a personal project. Thank you for any and all help provided.
 
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I realized I was a little too vauge in my original post so I wish to clarify some things. First off, I realized that the cement most likely would not provide the kinetic energy necessary to launch the 1 ft boulder which I estimate to be about 120-140lbs (54kg-64kg). My new plan is to fill two (or more) 55 gallon water drums which will give me about 416 kg of weight. So, after doing some rudimentary calculations to the best of my ability, I found (or think I found) that this is not going to provide enough force for me to reach my intended goal. Can anyone confirm/refute my results? If they are confirmed (that is to say, I need more force) what can I do to increase my force besides increase the counter weight? If I do need to increase the counter weight, how much would be necessary?
 

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