How to build a trebuchet ? ? ? ? ? ? ?

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Try here for a start: http://members.iinet.net.au/%7Ermine/gctrebs.html
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Bruno Beam wrote:

Here's my little one:
http://www.geocities.com/Paris/Rue/5407/treb.html
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Michael McIntyre ---- Silvan < snipped-for-privacy@users.sourceforge.net>
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http://www.ripcord.ws /
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On Sun, 12 Dec 2004 12:36:58 -0500, Silvan

that's what y'all call little????
these are sub-atomic, then! https://home.comcast.net/~mac.davis/trebs.htm
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mac davis wrote:

As trebs go they aren't very big. See the world champion pumpkin hurler for example <http://www.yankeesiege.com --hurls pumpkins over a quarter mile. Hurls Buicks lesser distances.
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mac davis wrote:

Yup. The real ones can throw Volkswagens. :)

Also less crappy looking than mine, but mine wins for having the most unique counterweight I've seen someone use on one of these things.
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On Tue, 14 Dec 2004 02:38:12 -0500, Silvan

http://www.trebuchet.com
Buy one of their Desktop models, then simply scale up the size, remembering that strenth varies as the square of linear dimension but weight by the cube.
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On Tue, 14 Dec 2004 14:26:57 GMT, "U-CDK_CHARLES\\Charles" <"Charles

and note that the counterweight should be about 16 times as heavy as the projectile..
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mac davis wrote:

I guess my arm is too thick, or too short, or something then. It runs on roller bearings, so friction has practically nothing to do with it. A baseball weighs, what, about 5 oz. I think. My counterweight is about 65 pounds. So I've got about 208 times the projectile for weight. It ought to throw the thing further than a piddly 100' it seems like.
Too much energy directed into up, and not enough forward maybe. Could be. I did have a little whoopsie. I guess the statute of limitiations is up. We were throwing rotten apples at the gigantic concrete wall near my house. Splat, splat, splat, whooooosh. Oops. Threw one right over that 20' wall and onto the highway on the other side. <whistle, look at feet, run like hell> If anybody asks, kids, I was just over here yelling at you for throwing apples at the wall. I had nothing to do with this. :)
No glass, no horn, no crunch, no harm, no foul, but we put the treb away and that was the last time we played with it. There's no longer any place to shoot the stupid thing since all that stuff went up, and I sure don't want to get somebody killed. <sigh>
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On Wed, 15 Dec 2004 03:48:15 -0500, Silvan
more weight is usually better, but the distance will stop at a certain weight no matter how much you add..
arm size, length and balance are critical, as I recall, haven't built one in a few years and mine were LOW tech for sale purposes... no screws, glue, metal, etc... all wood except for the bit of string & cloth..*g* I seem recall that the best balance point is having the pivot "20% to 25%" behind the front of nose of the beam.. I think we used to figure that the distance from the pivot to the hook was 4 times the distance from pivot to nose, or something like that..

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Start here: http://www.ripcord.ws /
Read everything and follow the links. More about trebuchets than you ever thought there was to know.
On 11 Dec 2004 22:47:07 -0800, zendo_joystick_ankh snipped-for-privacy@yahoo.com.br (Bruno Beam) wrote:

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Here's the one a friend of mine built out of his son's Tinkertoys: http://www.stonekeep.com/trebuchet /
(Yes, I have weird friends.)
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Has everyone in here forgotten the satisfying effectiveness of a well-thrown Molotov cocktail? Keep it simple, folks. Keep it simple. FoggyTown "Cut to shape . . . pound to fit."
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