According to Donald B. Siano, in his analysis of trebuchet physics (Trebuchet Mechanics, March 28, 2001), the optimal release position and design, based on his definition of "range efficiency" is such that: • The initial release position is such that the beam on the counterweight side makes an angle of 45° with the vertical. 3) Load the projectile into the pouch. So as you say, the release angle is the angle your projectile should travel along relative to horizontal. The sketch clearly illustrates the trebuchet sling , angled release pin, release angle and beam. The 45 degree angle creates an arc so that the object is sent into an outward projectile motion, reaching a greater distance. To begin, enter the parameters of your trebuchet in the input boxes on the left. release pin shape pictured in figure 20. Getting it to release at the optimum time, however, is a little bit difficult. Generally 35-40 degrees are the angles you want to shoot for, though there are differing schools of thought on that one. Next, press the submit button located under the inputs.

Forward facing by 30º is the norm – but the length of the sling and the angle of the pin interact greatly, so make sure to change both while testing to exploring the full potential.

How does a trebuchet work? I used a 75g water balloon with 20 lbs of counter weight. VirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. it will be released early). There is a small trebuchet competition, You are allowed a maximum height of 1 meter, when it's in the cocked position, and the supplied ammo will be tennis balls.

Figure out the length of the beam, assuming a cocking angle of 45 degrees. The sling on the end of the trebuchet releases upon an angle α, at which point the counterweight does no more work on the projectile. The more in line with the lever arm the holding pin is, the smaller the release angle, α, is. Virtual Trebuchet 2.0. The projectile in the sling is accelerated by being lifted and released at a particular angle depending on the release pin, giving the projectile gravitational potential energy and kinetic energy. The release pin’s purpose is so that the object doesn’t stay in the bottom of the pouch on the end of the sling, and it is able to be thrown. Finally, watch your trebuchet … Citation: "How a … Wheels: Below is a photo montage of a basic trebuchet design. The angle and adjustment of the release hook can be adjusted forward to attain good results with a heavier object.

Unfortunately, the strobe light was unable to capture the pouch releasing from the release pin.

The word “trebuchet” derives from a Middle French word meaning “overturn”, and its structure comes from an ancient variation of the sling. A trebuchet is a rather complex instrument. A trebuchet consists of five basic parts: the frame ... while the other is tied in a loop and slipped over a release pin extending from the end of the beam. At the opposite end of the piece of wood, screw in an eye hook at an upward angle so the look as on the side of the piece of wood and the screw is near the end of the wood. My first shot was a rear shot that popped the balloon before release. Secure the release pin using the hose clamp (pictured in figure 19) or zip ties provided in the kit.

Modifying the release pin angle will also affect the trajectory of the launch. To my knowledge such a thing does not exist.

"The sling of a trebuchet eventually swings ahead of a release pin. How do you calculate release pin angle? As the beam rotates, it pulls the sling, with its enclosed projectile, down the guide chute. To achieve maximum range, the release point should be between 40 and 45 degrees.

Hey guys, I have a couple questions about the sling rope placenent, and the release pin angle. One can change this release angle by adjusting the angle of the holding pin at the end of the lever arm. One modification to what jfriberg said: The arm doesn't have to stop, and on a trebuchet typically doesn't. Second shot was about 40m straight. Lots of folks envision some sort of complicated mechanism when the reality is very simple -- just centrifugal force pulling the free end of the sling off the pin.