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Trebuchet development (Read 5288 times)
HurlinThom
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Trebuchet development
Apr 8th, 2013 at 12:12pm
 
For the 2013 hurling season I've got a new arm for Brutus under development. Similar to last year's model, but with some of the cobbier areas cleaned up, somewhat strengthened to withstand an increase in counterweight, and a more aggressive leverage ratio and "bent arm effect".

Need to get 4 pound pumpkins past 100 meters instead of 3 pounders out to 100 yards. It might have been possible with the old arm but I enjoy building stuff as much as using it. In fact I'm in the planning stages for 2014, if I keep competing. I might be getting a little old for that; I know I'm slowing down.
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New_arm.JPG (69 KB | )
New_arm.JPG

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Curious Aardvark
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Re: Trebuchet development
Reply #1 - Apr 8th, 2013 at 12:59pm
 
looking good Thumbs Up

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Mauro Fiorentini
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Re: Trebuchet development
Reply #2 - Apr 8th, 2013 at 9:11pm
 
Topic added to the PW's index.
Greetings,
Mauro.
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HuntsmanSling
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Re: Trebuchet development
Reply #3 - Apr 11th, 2013 at 3:53pm
 
How did you get into making siege weapons? Are all of your recreations on a semi-small scale? Thanks for sharing! Now I want to get into this!
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squirrelslinger
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Re: Trebuchet development
Reply #4 - Apr 11th, 2013 at 10:53pm
 
HuntsmanSling wrote on Apr 11th, 2013 at 3:53pm:
How did you get into making siege weapons? Are all of your recreations on a semi-small scale? Thanks for sharing! Now I want to get into this!


http://dale.chatham.org/Interests/Catapult/RipcordTBT.pdf
I have actually built this thing... using poplar wood and nails to hold stuff together instead of listening to the directions. It blew up after 5 shots.

I did use oak for the throwing arm and axle pivots.

Its really fun, now I mostly just make stuff by lashing staves together.
Keep in mind that this is Squirrel, not Hurlinthom. I am betting his catapults are better made than mine.
Nice throwing arm, HT!
-Squirrel
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HurlinThom
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Re: Trebuchet development
Reply #5 - Apr 12th, 2013 at 12:01pm
 
HuntsmanSling wrote on Apr 11th, 2013 at 3:53pm:
How did you get into making siege weapons? Are all of your recreations on a semi-small scale? Thanks for sharing! Now I want to get into this!
I just sort of fell into trebuchets (haven't built other types, but am considering an onager). I saw a TV show on "reconstructing" Edward 1's War Wolf, silly because nobody knows anything about its construction, just a contest between 2 full-sized trebs. Then, checking out sites on medieval re-enactors I found the Grey Company, some Aussies who have built a number of siege engines. They had a link to some other sites, notably RLT Enterprises and Ripcord's (former poster here). Those showed some small trebs, and I needed a hobby, so I started.

As to size, my two biggest had frames about 6 feet (1.8m) tall. Smallest was designed to fit into a cube 2 feet on a side, threw tennis balls over 70 feet. I mostly work solo and can't handle bigger items. You can read about my stuff on a constantly-under-construction web site Trebs on the Web. Or for current activity, Eastvale Trebuchet Works on Facebook.

My philosophy is that the frame doesn't directly affect performance; it's there to provide solid support for the moving pieces that do. So make a sturdy frame the right size and go ape with the arm, sling, counterweight, etc.

SquirrelSlinger, I've built a few trebs using Gorilla Glue instead of nails (hate those) or screws. Holds up under throwing but deteriorates from weathering. This one is glued construction: http://youtu.be/JLDS21YdEBc
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HurlinThom
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Re: Trebuchet development
Reply #6 - May 5th, 2013 at 5:36pm
 
Just an update. To go with the new arm there's a new counterweight holder with revised dimensions that let me load more weight while keeping things narrow for clearance. Here's a photo showing the treb with the new arm and CW assembly mounted.
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setup_side.JPG (316 KB | )
setup_side.JPG

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HurlinThom
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Re: Trebuchet development
Reply #7 - May 10th, 2013 at 11:54am
 
Another photo, this one of the upper frame with the arm cocked, showing how the offset bracket works, and the angle that the counterweight is propped at. There are 20 10-pound barbell plates here, 4 rows of 5 for a total of 200 pounds (91 kilos).
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Top_cocked.JPG (245 KB | )
Top_cocked.JPG

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Rat Man
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Re: Trebuchet development
Reply #8 - May 16th, 2013 at 10:30am
 
I've said this before... this is really cool stuff!!!
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HurlinThom
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Re: Trebuchet development
Reply #9 - May 16th, 2013 at 11:52am
 
Rat Man wrote on May 16th, 2013 at 10:30am:
I've said this before... this is really cool stuff!!!

Now if the weather had been cool I would have gotten some testing in. Everything's ready....except me. My little bout of heatstroke(?) last year has left me overcautious about exertion in warm circumstances.
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