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How Can You Optimize Range for a Trebuchet?

04/03/2010 9:30 PM

Hello, I am a high school student who has been given an assignment to build a trebuchet using the principles that we have learned in class already (gravity, gravitational and kinetic energy, projectiles and such).

How would you figure out the length of the arm to optimize the range?

From research and general physics knowledge, I am aware that the projectile must be shot at a 45 degree angle and that the counterweight vs projectile ratio for mass should be significantly big (10 to 1ish).

I know how it should work but I don't really know how to plan for it. Is there a way to mathematically determine the optimum arm length, sling length, and such? How might you make sure that the projectile is released at a 45 degree angle?

We have already built a trebuchet based on a plan we saw on the internet, but it ended up being way too small.

A bigger trebuchet would yield great range, right? Since you can add a greater counterweight and also increase the height of the counterweight further? Does the height of the counterweight affect range at all?

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#1

Re: How Can You Optimize Range for a Trebuchet?

04/04/2010 1:22 AM

In a project like this I suspect some rules. What are they?

Minimize losses and optimize the effect of the weight..

An idea might be not to have the weight traveling sideways,

You may have seen a solution during experiments done in the past.

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#2
In reply to #1

Re: How Can You Optimize Range for a Trebuchet?

04/04/2010 11:29 AM

There really wasn't ver many rules, except the fact that no part of the trebuchet may exceed a metre in length. The counterweight cannot be more than 40 pounds. The design and everything else other than the dimensions are pretty much up to us to decide.

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#3

Re: How Can You Optimize Range for a Trebuchet?

04/04/2010 12:41 PM

My advice

Take your handbooks and go to

the playground , see saw etc and calculate what you find in terms of your formula.

Go to the circus and look at the act of the acrobats using the see saw jump board.

Draw your concept and apply your formula, acceleration , speeds, leverage etc.

Best of luck and please post your design and the results so we can congratulate or educate you later.

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#4

Re: How Can You Optimize Range for a Trebuchet?

04/04/2010 10:49 PM

If you read the CR4 rules, you are supposed to search CR4 before posting your question, and I know you didn't do that.

Chris

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#5

Re: How Can You Optimize Range for a Trebuchet?

04/05/2010 9:34 AM

Since you registered

sign up for the daily digest

the answer will become clear

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#6

Re: How Can You Optimize Range for a Trebuchet?

04/06/2010 4:12 AM

Phun is a great free way to check out your designs.

Click on download:-

And choose your Operating system.

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#7

Re: How Can You Optimize Range for a Trebuchet?

04/07/2010 7:49 AM

I advise going to first principles. That is what this assignment is all about.

What kind of simple machine is a trebuchet?

How can one maximize the advantage of this type of simple machine?

What is the most important determinant of the forces in this simple machine?

If you can clearly answer these three questions, you will know what you have to do to maximize its "production."

Ladies and gentlemen, Please let our newest colleague think about these himself. Strawbow, I will check back tonight to follow up with you.

milo

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#8

Re: How Can You Optimize Range for a Trebuchet?

04/09/2010 12:23 PM

Just go and play with the CR4 Trebuchet challenge....

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Users who posted comments:

Anonymous Poster (1); chrisg288 (1); Garthh (1); Hendrik (2); Milo (1); Randall (1); Rick@cae (1)

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