- #1

- 9

- 0

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter LoLzAsian
- Start date

- #1

- 9

- 0

- #2

Drakkith

Staff Emeritus

Science Advisor

- 21,136

- 4,969

- #3

- 9

- 0

- #4

Drakkith

Staff Emeritus

Science Advisor

- 21,136

- 4,969

- #5

- 9

- 0

- #6

- 6,054

- 391

- #7

Drakkith

Staff Emeritus

Science Advisor

- 21,136

- 4,969

Can you treat the sling as a lever?

- #8

- 9

- 0

Can you treat the sling as a lever?

The sling is not treated as a lever, the trebuchet is basically a lever that in turn powers a sling, thus accelerating the projectile at a massive rate.

- #9

K^2

Science Advisor

- 2,469

- 29

You have two conservation laws. Trebuchet will conserve energy and it will conserve angular momentum. That gives you two equations in two unknowns, the unknowns being the final velocities of projectile and counterweight. Write down both equations and solve them together. Angular momentum conservation is a linear equation, so use it for substitution into the energy conservation equation, which should yield a single quadratic equation for final velocity of the projectile.

It's pretty straight forward. Just make sure your signs are consistent.

- #10

CAF123

Gold Member

- 2,933

- 88

- #11

A.T.

Science Advisor

- 11,161

- 2,594

Google "trebuchet calculator". Some sites provide the theory and source code.

- #12

- 9

- 0

- #13

- 6,054

- 391

i was thinking that first i would

A very laborious effort. Just use the conservation laws, as suggested by many posters above.

- #14

- 9

- 0

Can you please provide an example?

- #15

- 9

- 0

You have two conservation laws. Trebuchet will conserve energy and it will conserve angular momentum. That gives you two equations in two unknowns, the unknowns being the final velocities of projectile and counterweight. Write down both equations and solve them together. Angular momentum conservation is a linear equation, so use it for substitution into the energy conservation equation, which should yield a single quadratic equation for final velocity of the projectile.

It's pretty straight forward. Just make sure your signs are consistent.

Can you please provide an example?

- #16

K^2

Science Advisor

- 2,469

- 29

I know how to account for the sling dynamically. If you have access to Mathematica, I can write up a notebook that does numerical computations. But as far as simple solution you can do yourself, I'm not sure I have anything yet. I'm going to put a bit more thought into it, and get back to you if I come up with anything.

- #17

- 9

- 0

A very laborious effort. Just use the conservation laws, as suggested by many posters above.

that's what i originally thought of using but i'm not sure if that will allow for the range of difference in length on both sides that provides leverage. if i thought that would work i wouldn't be asking for help

- #18

A.T.

Science Advisor

- 11,161

- 2,594

Trebuchet Mechanics:

http://www.algobeautytreb.com/trebmath35.pdf [Broken]

Softwares:

http://www.algobeautytreb.com/

http://ronleigh.com/ivytech/_ref-trebuchet-range.htm [Broken]

http://www.algobeautytreb.com/trebmath35.pdf [Broken]

Softwares:

http://www.algobeautytreb.com/

http://ronleigh.com/ivytech/_ref-trebuchet-range.htm [Broken]

Last edited by a moderator:

Share: