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TREBUCHET

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... not going as far as you would like (meaning 2 feet in front of you) ... Celebrity Endorsement. We are the cast of the television series: Star trek Voyager. ... – PowerPoint PPT presentation

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Title: TREBUCHET


1
TREBUCHET
  • A trebuchet owners manual by Jennifer Andrea

2
Trebuchet
  • A trebuchet is an ancient weapon, sort of like
    its predecessor, the catapult.
  • The difference is, a trebuchet uses a
    counterweight, and gravity, to throw an object.
    The object that is thrown is also in a sling not
    in some sort of bowl.

3
Four Main Designs
  • First is the simplest, and the least affective
    which is fixed counterweight without wheels.
  • The second is a fixed counterweight with wheels.
  • Third is the swinging counterweight without
    wheels.
  • The last is the most affective is the swinging
    counterweight with wheels.

4
Materials for building a trebuchetThese are the
materials to build a swinging trebuchet with no
wheels.
  • For the base
  • A lot of wood
  • Nails and screws. Preferably 5 to 6 inch nails,
    that way they go through the 4 x 4s and 2 x 4s.
  • For assembly
  • Hammers
  • A drill with many drill bits.
  • A father or two for help using the powerful tools.

5
Materials needed to build a trebuchet...
  • For the arm
  • Wood and Nails. Screws work well also.
  • An axle that the counterweight will be attached
    too. Rope attached to the projectile.
  • For the counterweight
  • A 5 gallon bucket
  • A bag and a half of Cement
  • An eye bolt connected to a piece of wood, placed
    halfway down the cement to give it strength.
  • Chain to hold the counterweight

6
Team Members
7
Assembly
  • Once you have all of your materials and a design
    on how you want your trebuchet to look, here
    comes the fun partthe assembly.
  • First focus on the base. Make sure that it is
    small enough to transport it from a house to the
    launching site. But also big enough to hold all
    of the weight.
  • Next work on your frame, for us it was an
    A-frame. Make SURE the frame doesnt wobble when
    it is attached to the base. Your frame should be
    able to hold the weight of the arm, axle, and
    counterweight. If your frame wobbles there is
    chance of destruction on first throw. While
    working on your frame, have a couple people
    working on your counterweight, so it has time to
    settle, and set.
  • Now that you have that done, it is time to build
    the arm. In construction of the arm make sure
    you have people out getting a VERY strong
    (preferably solid metal) axle.
  • Then assemble how exactly you want it and you
    have yourself a trebuchet.

8
Adjusting
  • After you have a design and have put it together,
    here are some tips for adjusting the trebuchet.
  • For distance adjust the length of the string or
    sling. Also the angle of the release hook. To
    make the angle higher make the hook a little
    straighter.
  • For Accuracy first move the trebuchet in the
    direction of the target, making a straight line
    from the arm to the target. If you are throwing
    too high or too low, adjust the angle of release
    by moving the release hook like for distance.

9
Trouble Shooting
  • If the trebuchet is not working, and wont
    release the projectile properly, youve done
    something wrong, either in construction or in the
    angle of the hook. To fix this problem, there are
    some things you need to do. First, if the
    projectile is going backwards, readjust the angle
    of release, going in the opposite direction.
    Test it again, and if it is still not working,
    youve screwed up. If the projectile is not going
    as far as you would like (meaning 2 feet in front
    of you), forget the whole idea of using a sling,
    and attach the projectile to a string instead.
    If you are already using a string, redo the knot
    and try again. Either that or add more weight to
    the projectile, depending on the weight of your
    counterweight.

10
Safety
  • Always remember that when you are working with a
    trebuchet, it can fall on you and/or your
    partners. Never, I repeat, NEVER put your head
    under the counterweight, this could prove
    disastrous. Also, never stand in the path of the
    projectile, it might go backwards, you never
    know. Little siblings on the other hand, can be
    substituted for targets if there is not one
    readily available. Also remember that a
    trebuchet is a weapon and can cause damage to the
    surroundings.

11
DISCLAIMER
  • The miss proper use of this equipment will result
    in injury. Please be sure to properly assemble
    this trebuchet in order to have the utmost
    safety. We as the trebuchet experts, are not
    held responsible for any mistreated materials or
    faulty construction and cannot be held
    responsible for any injury as a result there of.

12
Celebrity Endorsement
  • We are the cast of the television series Star
    trek Voyager. We heard that our friend Jennifer
    was in need of a celebrity endorsement, so we
    gave her a call and asked what for. When she
    told us that it was for an ancient weapon we
    jumped on the chance to help her out. So all 9
    of us are here to support her and her partners
    efforts. Therefore we encourage everyone to go
    out and build their own trebuchet and remember,
    when we get home we expect everyone to have their
    own trebuchet.
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