If you want to discuss contents of this page - this is the easiest way to do it. This book also contains some useful designs and building tips: A very simple model we have used in my Intro to Eng class just uses the mass of the projectile (m2), the mass of the counter weight (m1), and the height the counter weight falls (h): Range (max) = 2 * (m1/m2) * h Now the efficiency of the trebuchet will cause this model to be off by quite a bit. What I'm really looking for is a formula for a trebuchet that I can input the desired initial velocity after launch and mass of the object, and from that figure out how long the long arm, short arm, Stack Exchange Network. Overall, how would you rate the quality of this project?What is your enthusiasm for science after doing your project?Compared to a typical science class, please tell us how much you learned doing this project. For a very impressive science project, you could also compare the range of the trebuchet you build to predictions based on hand calculations and/or computer simulations you make (above). Popular choices are polyester and nylon. For any other use, please contact Science Buddies. The optimal trebuchet design is one that launches the payload the farthest horizontal distance. Unless otherwise stated, the content of this page is licensed under Different bundles have different needs depending on length diameter and size. The pivoting arm, from the counterweight hanger axle to the tip with the release pin. VirtualTrebuchet is a web based trebuchet simulator that will allow you to quickly evaluate different trebuchet configurations. This optimum tuning is a release with arm and hanger aligned vertically and stopped with the sling releasing at the optimum angle (see sling length on this page). In addition to building prototypes of a trebuchet, you can also use physics calculations or even a computer simulation to help you design it to have the best range. Append content without editing the whole page source.
There are a few methods of proppingThe optimum release for a King Arthur is quite achievable, especially if it has a floating axle or wheels and a light frame. I found some good web pages with highly detailed answers to predicting the range of a trebuchet. Once the correct change is determined a guess or calculation is made about the amount of change needed, and it is applied to the machine. Removing all possible potential energy from torsion devices means that the arm has finished rotating.The tuning process consists of making adjustments to the following factors to progress toward the optimal tuning, or release conditions of having used all the energy as descried above. In the case where the axle or frame can roll, it should also be stopped. For poorly optimized sling length, negative pin angles or pin angles of greater than 90 degrees may be needed. What real-world things (like air resistance, or how exactly the payload is released from the sling) were difficult to account for in your calculations or simulations? Autodesk Inventor software is available as a free download for students from: Figure 3, below, shows a sketch that can help you start thinking about how to set up the problem, and the variables involved. For whippers and King Arthurs having the maximum hanger length is even more important because the hanger length adds to the counterweight drop distance, and therefore total energy.For most trebuchet designs the higher the cocking angle (more rotation added in the cocking process) the better because it adds more energy. It has not been tested much but generally smaller provides more speed when speed is limited by rope recovery rates, and larger provides more torque.The angle or arm rotation is usually near 90 degrees however larger angles of rotation have been tried with success.
Adding spin takes energy, so it may be harmful to range. On one end of the trebuchet is a projectile you want to fire and on the other end is a counterweight that falls quickly to raise the throwing arm. In simpler terms a longer sling will make the projectile come around slower while a short sling will make it come around faster. To begin, enter the parameters of your trebuchet in the input boxes on the left.
m2 is the mass of the payload (kg). If resting on the ground, a combination of sling length and arm top height usually set the angle of the sling, but in some cases it can be adjusted. This page, like many others, is incomplete. More rotation also causes torque to drop off more at then which can be countered with longer bundles.The bundle is usually not tuned, but its tension is often changed. Anyway, release height is almost always going to be a bit less than long arm length + axle height + sling length if the trebuchet is anywhere near well tuned.
On site frame by frame analysis can be done with most modern digital cameras at can usually determine what is wrong with some good interpretation, however smaller devices have shorter and proportionally faster movements which can be a problem especially with torsion devices.The projectile when released from the sling (assuming the arm tip is stopped) will travel at an angle perpendicular to the sling. In the case where the arm stall causes release the sling needs to be shortened to release sooner.The sling can hang vertically or rest in a trough or on the ground.
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