Trebuchet Simulator

To aid designers and enthusiasts (and anyone who wants to win a trebuchet competition), I created a trebuchet simulator, programmed in Microsoft Excel which simulates the motion of a trebuchet, and is very useful for trebuchet design. It captures all the essential trebuchet physics. And if you wish to build a trebuchet yourself, this trebuchet software program allows you to optimize the dimensions of your trebuchet for maximum throwing distance, and also allows you to determine the required finger angle which results in the trebuchet releasing the payload at the right time, for maximum throwing distance. The required finger angle is based on the friction between the finger and ring. See the link above for an explanation of finger angle and ring.

A user manual in PDF format is included with the Excel program.

The simulator is straightforward to use and since it is programmed in Excel the design data is displayed automatically in charts, for easy reference.

The figure below shows an example of a chart in the Excel spreadsheet, which shows range (throwing distance) as a function of release time.

maximum distance chart for trebuchet throw

Below is a screen capture of the Excel spreadsheet.

screen capture of excel spreadsheet for trebuchet simulator

With the simulator you can also:

• Choose whether or not to use a guide chute.

• Calculate sling tension, and the reaction forces at the fixed pivot location of the beam (to which the sling and counterweight is attached).

Accurately predicting the motion of a trebuchet requires a lot of complicated mathematics. Having a software program, like this simulator, will save you a lot of work.

All the files that come with this trebuchet simulator are contained in a single (compressed) file, in the "zip" format. This file is 2.4 MB in size. You need to uncompress this file before you can do anything. This file can be uncompressed with several different types of compression software (such as WinZip, which may already be installed on your computer). If you don't have compression software on your computer, or you are unable to uncompress the file with the software you do have, you can download and install the 7-zip compression software on to your computer. It's available for free at:

To use the trebuchet simulator program you need to have Microsoft Excel installed on your computer. The program is compatible with all versions of Excel.

The cost of the Excel program plus manual is $7.95 USD, and is payable through PayPal.

To purchase, click on the Buy Now button below. This will open another browser window, which will take you to the PayPal site. From there you can enter your purchase information, and then download the product.

Support is available if you have any questions or need assistance with anything. You may email me via my contact page. My alternate email address is: email address treb. If possible, write me with the same email address that you entered in the purchase form. This isn't necessary but it just makes it easier for me to confirm that you actually purchased the product. If you didn't purchase the product your support questions will go unanswered.

Since the simulator cannot be returned after it is downloaded, refunds (if requested) will be determined on a case by case basis.

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