2 OF's need plans - Graybeard Outdoors
Reply
 
LinkBack Thread Tools
post #1 of 53 (permalink) Old 02-25-2017, 09:14 PM Thread Starter
Super Moderator
 
Join Date: Dec 2002
Location: Cut Bank, MT
Posts: 14,697
Default 2 OF's need plans

Two old guys with to much time on their hands looking for a project, so we decided to build a Bowling ball trebuchet. Anybody have any idea where we can find some plans?
Double D is online now  
Sponsored Links
Advertisement
 
post #2 of 53 (permalink) Old 02-25-2017, 09:35 PM
Senior Member
 
Ex 49er's Avatar
 
Join Date: Jul 2005
Location: Behind the Redwood Curtain, Humboldt County, California
Posts: 3,719
Default

Found this on Google: http://www.instructables.com/id/How-...ome-Trebuchet/

When you're walking on eggs; don't hop!!
Ex 49er is offline  
post #3 of 53 (permalink) Old 02-25-2017, 10:07 PM
Member
 
Fredstaple's Avatar
 
Join Date: Jul 2014
Posts: 909
Default

My son gave me a small kit for Christmas, it was from Amazon. You could maybe get one and scale it up. This one shoots wood balls the size of marbles.
Attached Thumbnails
Click image for larger version

Name:	IMG_2684.JPG
Views:	25
Size:	80.2 KB
ID:	155546  


In one respect at least the Martians are a happy people; they have no lawyers. Edgar Rice Burroughs
Fredstaple is offline  
Sponsored Links
Advertisement
 
post #4 of 53 (permalink) Old 02-26-2017, 01:04 AM
Member
 
carbineone1964's Avatar
 
Join Date: Aug 2014
Location: Columbus NE
Posts: 550
Default

Memory slipping Douglas. I would think you OFs would remember these first hand being used back in the day

So I assume this is a catapult you want to make? Freds looks more like a Mortar? So am unsure what you are thinking ..Look interesting for sure though, and probably alot of fun.
carbineone1964 is offline  
post #5 of 53 (permalink) Old 02-26-2017, 03:20 AM
Senior Member
 
nanuk-o-dah-nort's Avatar
 
Join Date: Oct 2010
Location: Smack Dab in the middle of God's Country! Saskatchewan, Of Course!
Posts: 1,529
Default

there was a program on TV where one group made a Trebouchet, and one made a catapult


the catapult was AMAZING! it would easily out shoot a Trebouchet by twice the distance.

I would think for launching HUGE weight (like 2000lb) a Trebouchet would be more effective, as it would be easier to upscale and still work.

but for bowling ball size and smaller, that catapult was incredible. it shot AMAZINGLY flat.

I am ONLY responsible for what I say
I am NOT responsible for what you THINK I said
nanuk-o-dah-nort is online now  
post #6 of 53 (permalink) Old 02-26-2017, 03:46 AM
Moderator
 
GGaskill's Avatar
 
Join Date: Jan 2005
Location: Central AZ
Posts: 6,570
Default

A trebuchet is a counterweighted lever while a catapult is a torsion spring powered lever. Large trebuchets can launch much heavier projectiles to much greater distance than a catapult. Here is a youtube of a big one in the UK:
At one time I thought about making a 10 footer and did some calculations for one but never followed through. There is, however, at least one website that has the calculations set up as a parameter list: Virtual Trebuchet. However the one that impressed me most was The Algorithmic Beauty of the Trebuchet.

GG
“If you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.”
--Winston Churchill

Last edited by GGaskill; 02-26-2017 at 03:50 AM.
GGaskill is online now  
post #7 of 53 (permalink) Old 02-26-2017, 10:27 AM Thread Starter
Super Moderator
 
Join Date: Dec 2002
Location: Cut Bank, MT
Posts: 14,697
Default

Well x-49 your link was interesting and it lead me to http://www.stormthecastle.com/trebuc...et-physics.htm which had some really interesting numbers. Ratio of weight of ballast to projectile, 133:1. So to lob our 16 lb bowling ball we a 2128 lb counter weight. Wow. Wonder if our eyes are bigger than our stomach.

There 10 foot Trebuchet would probable work just fine with the 6 PDR Zinc ball I shoot from the "junk yard dog". It looked interesting and might be a very doable project that we can get the Grand daughter involved in. Not to big.

https://www.youtube.com/watch?time_c...&v=iO-DUbCe0cY

Through various links in that webpage I found this one. A High school physics class project lobbing Golf balls.


That looks very interesting. Maybe more into our appetite. How they set uo to adjust the angle for the release pin is pretty clever.
.
George, the engineer for ever. At first I was a bit over whelmed by your links especially the Algorithmic link, way way over my head, way over. But right in the middle of his website is the tickler-a bowling ball trebuchet. No links or details, just two pictures. That fellow will get an email.

Looking at bit more at the Virtual Trebuchet link and some things started to click and I can see we can probably use this link for predicting the ballistics of our Machine. Thanks George.

I will have to talk it over with my friend and see what he thinks. We are looking for just a project to keep two retired old guys busy. We both have wives who like to find things for us to do when they think we aren't doing anything.

Keep the ideas coming.
Double D is online now  
post #8 of 53 (permalink) Old 02-26-2017, 11:09 AM
Member
 
Join Date: Apr 2003
Posts: 228
Default

My daughters built one with a 5' beam length and 20lb weight. It would throw eggs about 50'. The plans scale up from marshmallow throwers to old cars.
Mike Scott is online now  
post #9 of 53 (permalink) Old 02-26-2017, 05:13 PM
Senior Member
 
RocklockI's Avatar
 
Join Date: Jun 2008
Location: Colo.
Posts: 2,917
Default

Did you notice the "Hamster Wheel" on Georges pic ?

For a human to winch the arm down . Yea thats pretty big !

It must have been a real hoot to have seen that thing hurl a ball toward your own self..........?
Where in the ÷/€*^×@* is it going to land ?

Curator of the Military Museum in Stockholm holding the origanal Morko with my reproduction!
RocklockI is offline  
post #10 of 53 (permalink) Old 02-26-2017, 06:11 PM
Senior Member
 
thelionspaw's Avatar
 
Join Date: May 2008
Location: Trump's Bowling Green Skating Rink. If U got who U wanted; will U want what U are going to get?
Posts: 1,108
Default think big!


Protect Freedom of Speech; to identify IDIOTS!
thelionspaw is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Graybeard Outdoors forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome