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HurlingForums.com The online home for catapulting enthusiasts world-wide! 2022-12-19T19:53:46-05:00 https://hurlingforums.com/forum/feed.php?f=4 2022-12-19T19:53:46-05:00 2022-12-19T19:53:46-05:00 https://hurlingforums.com/forum/viewtopic.php?t=783&p=1344#p1344 <![CDATA[Other Topics • New Registrations]]>
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Statistics: Posted by The Admin — Mon Dec 19, 2022 7:53 pm


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2015-08-31T17:47:27-05:00 2015-08-31T17:47:27-05:00 https://hurlingforums.com/forum/viewtopic.php?t=582&p=894#p894 <![CDATA[Other Topics • Web page]]>


Go to the sidebar on the left to navigate the separate subjects.

Statistics: Posted by Thomas — Mon Aug 31, 2015 5:47 pm


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2015-07-29T22:34:34-05:00 2015-07-29T22:34:34-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=890#p890 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by Nick481 — Wed Jul 29, 2015 10:34 pm


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2015-07-28T16:42:34-05:00 2015-07-28T16:42:34-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=888#p888 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by madmattd — Tue Jul 28, 2015 4:42 pm


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2015-07-27T20:38:18-05:00 2015-07-27T20:38:18-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=887#p887 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by KerikM — Mon Jul 27, 2015 8:38 pm


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2015-07-24T14:57:14-05:00 2015-07-24T14:57:14-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=886#p886 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by madmattd — Fri Jul 24, 2015 2:57 pm


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2015-07-24T04:31:24-05:00 2015-07-24T04:31:24-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=885#p885 <![CDATA[Other Topics • Re: I'm back!!]]>
Hi Dave,
We do have this from our archives - I'm not sure if it's currently recognised by our records team but it has been in the past.

The greatest recorded distance for a catapult shot is 415 m (1,362 ft) by James M. Pfotenhauer (USA), using a patented 5.22 m (17 ft 18 in) Monarch IV Supershot and a lead ball on Ski Hill Road, Escanaba, Michigan, USA on 10 September 1977.

Best wishes,
Dan
Community Manager

Statistics: Posted by Dave — Fri Jul 24, 2015 4:31 am


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2015-07-18T22:25:02-05:00 2015-07-18T22:25:02-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=883#p883 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by Dave — Sat Jul 18, 2015 10:25 pm


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2015-07-15T11:28:24-05:00 2015-07-15T11:28:24-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=878#p878 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by madmattd — Wed Jul 15, 2015 11:28 am


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2015-07-15T08:36:00-05:00 2015-07-15T08:36:00-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=877#p877 <![CDATA[Other Topics • Re: I'm back!!]]> Statistics: Posted by Dave — Wed Jul 15, 2015 8:36 am


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2015-07-14T07:31:55-05:00 2015-07-14T07:31:55-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=876#p876 <![CDATA[Other Topics • Re: I'm back!!]]>
Check the following link out: . Once welded up into a structure, you will effectively have fixed-fixed end conditions, so your "effective length", Le, will be 0.5*L.

You'll need to work through that page, there are different formulas to use depending on the "slenderness ratio" versus a "critical slenderness ratio". When finding the critical slenderness ratio, σy is the yield stress of your column material. Note that I had an error in my formula for I, the area moment of inertia, in my last post, which I have gone back and fixed. You'll have to do a couple of iterative runs to get an idea of the load/length. My hunch is that you will end up as a "short column" setup, which uses Johnson's formula on that page, but you may be able to get away with Euler's after all.

I also found a decent-looking set of lecture notes on this topic that may be of help (it's been a while since I've looked at this stuff. Definitely a use it or lose it type of thing, though it's slowly coming back to me):

Or, yea, run the real-life test :)

Statistics: Posted by madmattd — Tue Jul 14, 2015 7:31 am


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2015-07-13T21:58:55-05:00 2015-07-13T21:58:55-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=875#p875 <![CDATA[Other Topics • Re: I'm back!!]]>
So looking at the truss now there would be the central tube (25x25) plus struts, diagonals and two outer chords on both sides of the tube... The struts would be extended at every 3 metres for the outer webbing.

Hope that makes sense?... Sorry I don't have a drawing to show you for easier understanding as I'm only using iPhone
Thanks for your input,
Dave

Statistics: Posted by Dave — Mon Jul 13, 2015 9:58 pm


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2015-07-15T19:45:03-05:00 2015-07-12T17:39:56-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=873#p873 <![CDATA[Other Topics • Re: I'm back!!]]>
The following link will be of help:

That is for a beam simply supported on the ends, not with ends locked as if they would resist rotation at the end (which at certain points in a throwing arm would in fact be the case). There are other scenarios at this link, which may be of help too:

You will need to calculate the area moment of inertia for these calculators, which for a box beam is relatively simple. For a solid rectangle where b=base, h=height. You have a hollow rectangle (square actually), so you subtract the area moment of inertia of the "missing" part. So, , where b1 and h1 are the outer base and height, and and are the inner base and height. Since you are using a square tube, b and h are the same, so . Using your 25x25x1.6mm box tube (I assumed those were metric dimensions, so a roughly 1"x1"x1/16" tube), . Watch your units and make sure you use common ones (m vs mm, etc).

Hope that helps!

Statistics: Posted by madmattd — Sun Jul 12, 2015 5:39 pm


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2015-07-10T17:18:31-05:00 2015-07-10T17:18:31-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=872#p872 <![CDATA[Other Topics • Re: I'm back!!]]>

Statistics: Posted by Dave — Fri Jul 10, 2015 5:18 pm


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2015-07-10T15:18:09-05:00 2015-07-10T15:18:09-05:00 https://hurlingforums.com/forum/viewtopic.php?t=578&p=871#p871 <![CDATA[Other Topics • Re: I'm back!!]]>
Time for the 'endless trebuchet'? :D

Statistics: Posted by madmattd — Fri Jul 10, 2015 3:18 pm


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