Punkin Chunkin Trebuchet // Homemade Science with Bruce Yeany
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- เผยแพร่เมื่อ 20 ต.ค. 2014
- Our biggest trebuchet is for throwing pumpkins. It is able to throw 8 pound pumpkins over 600 feet, lighter ones even further. The counterweight can range from 700 to 1100 pounds.
- วิทยาศาสตร์และเทคโนโลยี
This was the fifth trebuchet video I watched and the first to actually show the projectiles flight and distance. Thank you.
I really like the steep cocking angle, and the long hanger. Long hangers work great!
Nice trebuchet! I can tell you've had a lot of fun designing, testing and tweaking.
Hey! I was doing a project on Trebuchets at school. this really helped me. Thanks!
Not enough views for this brilliant contraption! Well done from England :)
Ste Dunn I agree, I'd like to show some more. Building these can become very addicting. We have built several smaller machines and variations, either by ourselves or by students in our classrooms in the study of engineering and design. Hopefully I'll get a chance to highlight these in another video. It's been a lot of fun! thanks for your comment. Bruce
Wonderful job!
I'm in the planning phase for a larger trebuchet making use of multiple spare telephone poles on my property with the intention of an annual pumpkin patch & pumpkin chunkin festival.
I've been told that adjustability is a good idea when thinking through a design.
Do you have any suggestions of how to utilize the poles in a way that's adjustable once in place?
Should I opt for a steel throwing arm vs the telephone pole?
Thanks in advance for any tips you can offer!
The release angle is nearly perfect for wide reach!
this video gives me a trebuchetgasm
I hope it was a good one!
Great video. How far do you think it would throw a, say, 90kg projectile?
probably about 10 meters. Are you thinking a human projectile?
Not necessarily a human. I heard back in the day a superior seige engine could launch a 90kg projectile over 300m - but we're talking huge counterweights.
good meme sir
Throw da bossy Waifu down the lake with it!
This is really helpful for my school project.
Good luck with it Ben, let me know if you have any questions
Interesting design on the one just to the left of you at 3:07. It looks like the throwing arm is pulled back nearly 360 degrees and the counterweight is directly above the arm's pivot.
HI Kevin, you have a good eye, that is a propped trebuchet, it has two triggers, the weight that hangs down is propped upside down, it swings part way down and then pulls the trigger to the big arm to swing down. It makes it throw a lot further than when the arm is just hanging down. I have a small one and plan to video it one of these days
How long is your arm (short and long arm combined?) Nice machine! Thanks.
do you care to share the dimensions of your trebuchet? Lever arm length and such. id like to build one very similar to yours.
i honestly could have watched another hour of this. is there a director's cut? lol
LOL, I have quite a bit of video left over, maybe I should make an extended version
wow
Nice video! What did you use for your release mechanism? I have students building medium sized trebs (10lb counterweight, launching a tennis ball) and I am looking for good ideas. Thanks.
our's is very simple. two eyebolts attached to the base. about 3 inches apart, the arm has an eyebolt the fits in between them and then a thin metal bar slides through all three, to release, pull the bar out. On my smaller machines, same deal only instead of a bar on the arm it is a short piece of rope tied to the arm and the rope has a loop in it. the metal bar slides though an eyelet, then the rope loop then the other eyelet
Bruce--How do you connect the pulley system to the arm when it's loaded up high? It looks like you have a sort of flagpole arrangement rigged with rope attached to the eyelet on the throwing end and attached somehow to the counterweight end that you pull the block and tackle up to? And then you have a bracket with a bolt or bar across it that the pulley clips onto? Any info on how you get that to attach, or what pulley system you are using? Do you have any videos of the whole process--attaching the pulley after firing, pulling the arm down, placing the safety, inserting the firing pin and then firing again?
I can give you a brief description, write me at Bgoknee@comcast.net
That is an awesome trebuchet! Just curious what size axle are you using?
thank you, the axle is 1 and 3/4 inches,
Hi Bruce - love the machine - great job! Is the frame box section steel or wood? And the throwing arm itself? It looks really sturdy! Thanks, Charlie from England
wooden frame mounted on an old boat trailer, this was the fourth arm that I built for the machine. The arm was made from two long 2 x 8 pieces of poplar wood. the long end of the arm has a thin sheet of metal sandwiched between the two halves, the3 short end is reinforced with 3/8 inch thick steel sheets that extends short distance past the axle. The previous poplar wood arm broke while throwing due to the strain,. this arm was made thinner but was reinforced with kevlar and epoxy resin. under load it bends about one foot under load
Load the sling with small stones or caltrops then you basically have ancient grapeshot.
we tried throwing a load of apples, that was fun
Hey Bruce, thanks for this video, it's awesome. I wanted to ask you something and I would really appreciate your help: I want to build a trebuchet to throw an egg 65 feet away, but I don't know where to start. There are so many variables, like the length of swing arm, mass of the counterweight, height, mass of swing arm, etc. What is that single variable that my team and I should be focused on to be closer to a successful result (landing the egg in a basket placed on the floor 65 feet away)? I would really appreciate your help, thanks!
When I started building trebuchets, I found quite a bit of information and plans on the internet and realized there were several different types. Try doing a search for golf ball trebuchets and there should be quite a few offerings. If you want to be more involved in the design, then traditional design like the one we have is an easy place to start. To get the dimensions for our large machine, I built a small one and made it so I could make several adjustments for testing purposes. Several holes in the arm for changing the axle position, adjustable hanger for the weights, make provisions so that you can add more weight, extras string on the sling and then try variations until you get the maximum distance. My advice is make a machine that you can adjust and test
I was going to ask a question, regarding whether working from a small model would benefit me and this answers it. So this comment is just to thank you for being a super helpful guy. Thank you.
Bruce-I love the design of your trebuchet. I built a knockdown in 2016, but it was a chore to load and put it together on-site every time. I love that it is built into the trailer, so I am building one similar with some high school students. What is the height of the axle point, and the length of the arm? And it looks open on top of the vertical axle support so you can just lift the arm/axle on top. How do you secure it afterward? And where did you get those weight plates? I really appreciate your help. Inspiring.
the axle is about 10 feet off the ground, if possible I would make it higher and make the back end shorter that would allow the arm to be pulled back to a steeper angle. we lift the arm and axle and fit it into a slot . we then bolt a cover plate to keep it from hopping out. we had a source of scrape lead so we made 55-60 pound plates by melting the lead and pouring it into a roasting pan as a mold
Great ideas. Do you have any plans you could share of this design? We’re just doing this for fun, and yours is exactly what I’m looking for. I have a 4x11 ft trailer, just trying to figure out how to attach it and keep it stable so it doesn’t need long diagonal braces on the sides….
I just helped my Nephew build a little different version with wheels on the throwing arm..I would appreciate info on how to make a sling release its ammo.NICE MACHINE! ANY HELP APPRECIATED
Rob Basham Hi Rob, what size is his machine? I have a very simple design for a desk top model. There are quite a few websites that are dedicated to how to build these machines and the parts for them. If you do a search for "How to make a sling for trebuchet" you will find several possible sets of instructions.
Tribok bereit, Sire!
I think if it didnt have wheels on it (or had breaks), it wouldn loose that much energy by rolling after shot. Or does it loose that energy anyway, just the ground absorb it?
you're second answer is correct. This type of trebuchet throws further when the body is able to move, when there is less friction, these machines can actually start to roll as the weight is falling. Allowing the weights to fall in a straighter line means it will fall faster, a more modern version of this idea are trebuchets that have movable axles for the arm. The other benefit with the wheels is it allows the machine to get rid of excess energy by rolling, when they are stationary the excess energy goes into the machine which may cause it to buck and tip, also harder on the frame connections
is there anyway I could get in contact with you for your measurements and schematic. I am building a pumpkin launcher for my college and I am trying to figure out the best design for an accurate build.
Dude, I am in high school and in a 3 person group, we were only given 2 2x4s and a couple of 1.5x1.5s and we have to launch 7lb pumpkins.
563 is really good for that size HCW Trebuchet. Timing looked right on. I have a lot of machines, but just made my first HCW. It's pretty tiny though, 16" Hahahaha WEEEEeeeeee!
we started small and just kept getting bigger
Our big treb is about 4 tons. Our Ballista is 3 or 4000 pounds. The Ballista was my first torsion machine. We went huge from the start! hahahaha Largest Inswinger ever built. Building a 1 ton Onager now, and a few other designs before the end of the year.
Anywhere to get the plans for this?
I like to throw pumpkins off high buildings. Thing is, not easy to pull this off. You need to get access to the roof, and do it in middle of night so nobody sees you to call the cops.
There's a place I know on the West Coast where you can do this. Not saying where, ha ha.
Have you ever managed to get velocity reading for any projectile?
we were just throwing some milk jugs a few weeks ago with half the weight, while the path would be an arc, the horizontal speed was roughly 60 mph. It would be faster if we threw using more weight on the arm with a light projectile and throwing straight ahead rather than releasing it on a 45 degree angle
Do you have the plans for this size machine? If so, where can I get them?
I haven't seen anyone that has plans for big ones, we see that when they get this large the design may be altered by what materials you have available. we built several small ones to better understand the mechanics of it and then went larger. The concept and behavior is the same. We use a 1/12 scale model to test out the set up for the most efficient throws and then apply it to the large one.
TIL there is competetive pumpkin chucking
Inspired by this video I build this one: photos.google.com/photo/AF1QipO72N-QogT-toTRSmPYCViWRCXB99M4c-4zk6jU
Now it's on fine tuning, soon it will fire. Thanks Bruce!
Hello Maga, I clicked on the site but it does not show any pictures, if you can check your posting, I would love to see what you have
i hope this link works: drive.google.com/drive/folders/0B3XNmkiXQ-_qMnlBOGRxRVNhenM?usp=sharing
It did, beautiful work, I love these machines. When it's finished, I hope you post a video of it firing.
I will post a video in a few weeks.
If they are Japanese, You can get Kataparuto tech and make it so fast. ageofempires.wikia.com/wiki/Kataparuto
😀
Very impressive machine! Does it have a name?
Bellum, latin word for "war machine"
Bruce Yeany A very fitting name.
He didn't get Bonked! in the head by the arm.
This could be an excellent fishing tool. Just fill up empty beer kegs with pressurized nitroglycerin. When they hit the water, BOOM, and all the dead fresh fish float to the surface.
I wonder what happens to those pumpkins once they hit the water.
+blackpanther Hello blackpanther, when they hit the water they break apart and the pieces float. There always seems to be a wind that pushes the remains to shore where it is picked up. The fire company that sponsors the event also sends boats out afterwards to clean up and additional pieces.
I thought they would break up into a few huge chunks, sense water is pretty much concrete if an object hit from high up in the air.
Fish eat them.
Robert Jensen That is some raw pumpkin pie then.
Use bowling balls. Use an empty apartment building as your target.
we throw 8 pound bowling balls for practice, with some holes drilled in them, the whistle very nicely
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in my dream i wss shooting down leviathon with my tresbuchet and pumpkins.... weird
Whoa, I guess the broken arm explains why you didn't use a modern style like a whipper, FAKA, or FAT2K.
UFO