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Atreb Simulator


NOTE: This item is being sold as a download-able zip file. If you prefer a disk version, please review our CD-Roms at www.TrebuchetPlans.com. See below for download instructions.

System requirements: A PC running Windows.


"Atreb estimated that I would throw an 8 lb pumkpin 943 feet - I actually hit 927 during competition, but that was into a slight headwind. I'd say it's pretty accurate."
-- Chris Gerow, Winner of the 2000, 2001, 2002 and 2003 World Championship Punkin Chunk, Trebuchet division.

Q: What's the best way to learn about trebuchets?

A: Build a lot of them!

What's the easiest, cheapest and safest way to test your theories about trebuchet mechanics? Use a trebuchet simulator!

What is ATreb? "A" stands for accurate, and "Treb" is short for Trebuchet. This is by far the most accurate trebuchet computer simulation you can get!

Engineered and programmed by Les Scholz, this simulator goes beyond just lengths and weights! You can add the effects of air drag, friction, do stress analysis on your arm, sling, pin, axle... and work out all the finer details of your trebuchet design before you even buy a single piece of lumber. It also includes a metric conversion calculator, release pin optimizer, and you can save hundreds of design parameters and simply load them from disk to work on different projects at the click of a button.

Download Instructions:
This item is available as a download-only product. The download instructions will be automatically emailed to you as soon as your payment has been processed. Be sure to use a valid email address during checkout, or you will not get the instructions. Also make sure you can receive email from RLT.COM (you may need to add it to your "whitelist" if you have one) and if you do not receive the email within an hour of ordering, then be sure to check your junk mail folder.
$19.95
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    Price: $19.95
    Minimum age: 10
    Availability: In stock.

    Buy Now or Add To Cart
    Item code: 99001

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Interesting Notes

Some Trebuchet History:

From the 13th century writing: "Itinerarium Peregrinorum et Gesta Regis Ricardi"

In June and July of 1191, Richard the Lionheart (the Duke of Normandy) laid siege to the city of Acre as part of the medieval Crusades.

The Duke concentrated on constructing siege machines and placing trebuchets [petrariae - literally, stone hurler] in suitable places. He arranged for these to shoot continually day and night. He had one excellent one which he called "Bad Neighbor" [Malvoisine]. Its continual bombardment partly destroyed the main city wall and shattered the Cursed Tower. On one side the Templars' trebuchet wreaked impressive devastation, while the Hospitallers trebuchet also never ceased hurling, to the terror of the Turks.

Besides these, there was a trebuchet that had been constructed at general expense, which they called "God's Stone-Thrower". A priest, a man of great probity, always stood next to it preaching and collecting money for its continual repair and for hiring people to gather the stones for its ammunition. This machine at last demolished the wall next to the Cursed Tower for around two perches' Length [11 yards or 10 meters].

The count of Flanders had had a choice trebuchet, which King Richard had after his death, as well as another trebuchet which was not so good. These two constantly bombarded the tower next to a gate which the Turks frequently used, until the tower was half-demolished. Besides these, King Richard had two new ones made with remarkable workmanship and material which would hit the intended target no matter how far off it was. . . . He also had two mangonels [traction trebuchets] prepared. One of these was so swift and violent that its shots reached the inner streets of the city meat market.

King Richard's trebuchets hurled constantly by day and night. It can be firmly stated that one of them killed twelve men with a single stone. That stone was sent for Saladin to see, with messengers who said that the diabolical king of England had brought from Messina, a city he had captured, sea flint and the smoothest stones to punish the Saracens. Nothing could withstand their blows; everything was crushed or reduced to dust.