Okay, so I think that a line launcher is a device used in rescues?

What I’m unsure please about is how they work, like the Batman grapple gun (is that a line launcher) or like a line launcher gun please?

Also please, for a trebuchet or catapult please, how is the weight related to how far the thing is thrown please?

  • 1
    $\begingroup$ This question is a bit unfocused. You can post multiple separate questions that are more focused. No need to ball everything up into one. Line launchers are probably pneumatic though some may use gunpowder. Trebuchets use a counterweight. Catapults have no counterweight. They use twisted leather which acts as a spring. Did you try a Google search first? There are detailed results under "Trebuchet Physics": real-world-physics-problems.com/trebuchet-physics.html $\endgroup$
    – DKNguyen
    Oct 23, 2021 at 16:49
  • $\begingroup$ The basic concept should be closer to the crossbow the Catapult or Trebuchet, isn't it? $\endgroup$
    – r13
    Oct 23, 2021 at 17:28
  • 1
    $\begingroup$ See Lyle Gun, for one. $\endgroup$
    – Phil Sweet
    Oct 23, 2021 at 19:51

1 Answer 1


Like a spear gun with a fishing line attached.

A classic concept based on a string tied around a rock which was first thrown then launched in a catapult then trebuchet etc

  • $\begingroup$ Hi, cheers Mike! How does a trebuchet launch stuff please? Isn’t that just a catapult? $\endgroup$
    – Johnny
    Oct 23, 2021 at 15:16
  • $\begingroup$ In some applications ( Naval, seacoast, etc) a launcher is a small cannon. $\endgroup$ Nov 22, 2021 at 16:51

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.