# Golf Ball Trebuchet

This is a trebuchet we made for our Concept Physics class. Our trebuchet threw a golf ball a distance of over 29 yards! We were the only all girls group in our class and we built the best trebuchet. We did a little bit of research and set out to construct our own and here is what we created!

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## Step 1: Materials

7 - 4 ft long 2x4"s
2 - 2 ft long 2x4"s
4 - 3 ft long 2x4"s with the ends cut at 45 degree angles
4 - swivel chair wheels
1 - 2 1/2' re-bar
an eye hook
4 ft of string
a sack

## Step 2: Building The Frame

1) Make a rectangle out of two of the 4 ft long 2x4's and the two 2 ft long 2x4's.

2) Take two more 4 ft long 2x4's and center them so that they lie flat in the center of the 2 ft long 2x4's. This will create the platform that the golf ball will slide along before being released.

3) Attach the swivel chair wheels to the bottom of the four corners of the frame. The wheels not only help with transportation but also allow more force behind the throw of the trebuchet.
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meelon186 days ago

Do you have any pictures showing the sack/sling set-up?

Kiteman4 years ago
you have an acceleration of 292 fts-2, but the other project published about the same trebuchet has an acceleration of 300ms-2.

I think you'd better check each other's data.
1 year ago
Well, after 2 years, 9 months, and 28 days your comment has its 34th reply.
I'm impressed.
1 year ago
Oh...kay... (edges quietly away)
4 years ago
I'm pretty sure that the last page says 292 m/s^2, not ft/s^2.
Do you have any idea what you're talking about, or do you just go around bashing on everyone's instructables to make yourself feel better?

Come on, dude, we're in high school. Nothing is perfect.
4 years ago
I guess I don't know what I'm talking about.

After all, I've only written 100 Instructables, and I'm only a Science teacher.  Yeh, what would I know about publishing an Instructable on a Science project?

That was constructive criticism.  Your teacher warned you that you would get criticism (I think the phrase he used was "If you do a poor job putting this together, the Instructables community will tear it apart!").  If you want bashing, I'll be happy to oblige, but maybe you'd prefer some questions that I would ask if one of my 12-year-old students handed this to me as a piece of work?
• Shall we start with the strange mix of Imperial and SI units?
• Or the claim of research done without sources being referenced?
• Or the 133:1 ratio, where did that come from?
• Or how you know that wheels increase the range?  Did you try it without?
"We're in high school" is not an excuse for not doing your level best.

Oh, and congratulations on finding the edit button.
3 years ago
It's very amusing to see a self proclaimed mature and intelligent individual paying out high school students.

Grow up and get some maturity.
3 years ago
Excuse me?  Age has nothing to do with this.

Unless you have led a very sheltered life, you should be aware of how important constructive criticism is to the learning process.

These students made mistakes which, if my own pupils had made them, would have been laughed out of the classroom by their fellow pupils.  The authors' own teacher gave them a specific warning about the expectations of this site.

Suck it in, get over yourself, and post something that isn't a waste of bandwidth.
3 years ago
You call your comment constructive criticism? More like sarcastic insults.

but hey whatever floats your boat
3 years ago
Can I help it if I have higher standards than you?

(Water, usually).
3 years ago
I am a teacher also and am surprised how rude your comments are to this student. I suppose in some countries you can treat children like garbage and call it tough but we always called it bullying. When a student confuses SI and English you don't yell at them or belittle. That is not an instructional technique. It is also a violation of the "be nice" policy. I have never read an Instructable with rudness like this and am wondering how such a person could work with any other human beings, much less children. Perhaps we could direct you to an instructable on forming and keeping human relationships.
3 years ago
I am suprised that somebody who claims to be a teacher does not investigate a story fully.

All I did was suggest that students check their data.

As for rudeness, did you bother reading your own post out loud before hitting "post"? Try it sometime.

3 years ago
Your follow up comments are rude. You don't take criticism well and respond with attacks instead of consideration of the critique. Perhaps that might be an instructable someday.
3 years ago
Clearly we are suffering a breakdown in communication here - possibly the lack of vocal tone, and a temporal dislocation of several months - but your reaction is far greater than the situation warrants.

All members here are on a level playing field - if you can't cope with a touch of sarcasm, you're not going to get far in life.

3 years ago
(removed by author or community request)
2 years ago
man that was intense
2 years ago
hahaha. bodies everywhere
2 years ago
blood stained floor
2 years ago
smell of burned flesh
2 years ago
ash floating in the air
2 years ago
screaming people running around
2 years ago
a low mist erupts from the ground
2 years ago
broken swords and spears lying around
2 years ago
the cries of a woman off in the distance
2 years ago
lol I don't know more
2 years ago
lol me 2
2 years ago
Then trollolols can be heard in the distance...
2 years ago
hahah
3 years ago
O.O Water? could you please explain? I don't get it.
3 years ago
Water. It floats boats.

3 years ago
Displacement floats boats.
3 years ago
i don't know how... but you just did.
3 years ago
>sigh<

3 years ago
Its okay Kiteman, I've read quite a few of your Instructables, and I realize that you actually do know what you're talking about. I've had teachers much like you, its always fun to have teachers with sarcasm who actually care about details.
2 years ago
@Kiteman
You are right. Criticism is needed to succeed. Obviously too much is bad. As my STEM teacher says; "Put on your yes face." :D
2 years ago
High school teachers (science or otherwise) are mild and tender compared to project managers, supervisors, commanding officers, CEOs, investors, voters, parachutes...etc. Looking back from farther down the road- developing detail oriented work habits now is easier than breaking the habits of carelessness later.

Just the opinion of a manager, commanding officer, supervisor, entrepreneur, adrenalin junkie, parent...etc.

The instructables community is an incredible resource of skill and knowledge that freely share with each other without expecting anything in return- wish I had had such support when I was in high school. If my teachers had had such a resource...
3 years ago
Then get it perfect. Scientists (and Science Teachers) like that. On the other hand, failure builds the character of a REAL Scientist. Perseverance, despite negative criticism, makes the REAL Scientist INVENT. IGNORANCE of constructive criticism makes a Scientist an OUTCAST. After all, Scientists work together. Join us. Your friendly Polymath...
Lorddrake2 years ago
In step 2 you state that ..

"The wheels not only help with transportation but also allow more force behind the throw of the trebuchet."

what is the basis for the assumption that the wheels add to the force?

the only way I see that being possible is if you are rolling the trebuchet downhill at the time of launch, and even then the added momentum would be negligible unless it is an insanely steep hill.

2 years ago
It let's it have a little more momentum
2 years ago
Agree!
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