treb logo treb logo


2009 Build and Test Pics Up

28 brand-new, never-before-seen images from the rebuilding and testing phases of Medieval Postal Service during the 2009 season are now available. Also, we have added information on the changes to MPS on the MPS page. A few other minor changes have been made, but those are the major ones. Hopefully we will roll out some more stuff soon.

2009 WCPC Video for MPS

Just a quick update, we have uploaded a video of all of our shots at the 2009 World Championships of Punkin' Chunkin'. More videos will be coming eventually, from our fall testing to other machines at the event, we took video of a lot of different machines. Other pictures of Medieval Postal Service from this year during modifications, and some information on those modifications will come as well.

Pictures from 2009 WCPC Online

We have uploaded 114 new pictures to the site from the 2009 World Championships of Punkin Chunkin. Also new this year is that not all of the pictures are from Matt's camera this time, Chris took a bunch too, and some are in the gallery. Enjoy all the pictures, most are of the extremely competitive trebuchet division, which saw a staggering 9 machines break 1000 feet, 5 of those machines never having broken that mark before in competition. Soon we will post a full trip report on the World Championships, there is a lot to talk about.

Team Urban Siege Presents the New Site! has been totally revamped! The entire site has been converted from static .html pages to .php pages, allowing for dynamic generation of the pages. While this makes no difference for the bulk of the pages, it has allowed us to condense the launch logs and news blurbs into one cohesive, pseudo-blog. This blog generates the pages of news on its own, removing the need for manual editing and recoding of 2-3 pages every time we post a news update. Visitors to this site may have noticed that we have been very inconsistent in posting news, and a large part of the reason for that was the length of time it took to post such updates. No more. Perhaps now we will post updates more often.

We Present: Tennis Ball Trebuchet Plans!

Team Urban Siege is proud to present Ripcord's Tennis Ball Trebuchet Plans available for download right here. A server issue cause Ripcord's site to go offline several months ago, and there is no timeline for its return. But we have the plans right here for all to download, free of charge. Just remember who actually designed them (Ripcord, not us, we merely edited a few grammatical issues and tweaked the layout for better file reading), and that our disclaimer still applies (as does Ripcord's, which is inside the file). Enjoy the plans!

Page Added on Material Properties

There is a new page that discusses material properties and how to design for a given stress. This aims mainly at trebuchet axles and how to pick a material to survive the stresses, and is a lead-in to a soon-to-come axle stress calculation page for trebuchets.

MPS Video From 2008 WCPC

We've finally made a page for Medieval Postal Service Videos, and linked to our YouTube video of it performing in Delaware. Also, some updates have been made to the links page, and added some more links in there as well. More stuff is in the works, stay tuned!

Team Urban Siege Has a Domain and a New Home

We've officially moved the website to our own domain name. We had just about out grown the free hosting account at 50Webs, only 1.5 MB of space left, out of 60 MB. Since a move was clearly in order, we opted to get a domain name, since they are now so cheap and if we need to move in the future, you won't need to update your links. Our new hosting has nearly unlimited disk space and any just about features we want, still free (just have to pay the yearly domain fee - not much at all). It also seems to be a bit faster than the old host, though it is far from blazing fast. Still, it should serve our needs quite well. Please make sure to update all your links to the corresponding pages at

Floatbox Updated, New Treb News

Updated Floatbox again, up to version 2.44. There are some issues with the display of the image galleries with Firefox 3 apparently, those will hopefully be resolved with the next version.

Floatbox Updated

Updated image gallery software (Floatbox) used for the pop-up image viewing. This update went from version 2.21 to 2.40, there were 6-8 updates skipped in between. The new version should work better, and has an image resize button for images that don't fit your screen directly. Check the upper left corner for the little "-" sign to accomplish this. Perhaps an About this Site page is in order...Later. Heavy designing for Delaware going on.

©2023 Matt DiFrancesco and/or Team Urban Siege unless otherwise specified. No reproduction of any content within this site for other than personal use (i.e. you will NOT reproduce anything here for monetary gain) is permitted without written permission from the team captain.

All material found within this site is to be used solely at the risk of the user. We will in no way be responsible for any incidents resulting from the use of said material. Please read our disclaimer before using any information found within this site.

Site optimized for viewing at resolutions of 1024x768 or greater on current versions of Internet Explorer, Firefox, and Chrome. Please report any viewing issues or broken links to or use the contact form.


All information found with this site or at other sites linked to from here is used at the sole risk of the user. Team Urban Siege and its members will be in no way responsible for any damage or injuries suffered from the use of this information.

Use "common sense" when operating trebuchets and catapults. Even little ones can be dangerous. Do not place anything you are not willing to lose in the plane of the arm rotation (this includes yourself, body parts, car windshields, cameras, etc). These catapults and trebuchets are capable of throwing just as far backwards as forwards, and the use of a backstop of some sort is recommended, though the use of one does not make the region behind it safe.

Also, just because the throw got away safely downrange does not mean the end of the danger. The arm is likely still swinging wildly along with the counterweight, and there is a sling whipping around. One thing many people fail to take into account is this sling; some people put a metal ring on the slip end of the sling and this ring can HURT when whipping around!

Have fun hurling, but please KEEP IT SAFE!!!