Date: Thu, 01 Sep 2005 12:36:21 -0500

Author: Patricia Sievert

Subject: free arm trebuchet

Post:

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Our physics club built a free arm trebuchet to toss watermelons for
Welcome Days this fall. Here's a "few" pics. The counter weight is not
adjustable in this initial version, but even so we were able to toss a
variety of melons. The larger 12-15 pounders lofted high and landed
about 3 meters from the treb and the smaller cantalopes and honeydews
went as far as 90 meters with proper adjustment of the sling! Next
phase is to get a hardened bar and weight plates to be able to adjust
the counterweight.
http://www.physics.niu.edu/gallery/view_album.php?set_albumName=album23
(There are also pics of one of our profs demonstrating Kyudo, a
medatative form of traditional Japanese archery.)
Pati
/Pati Sievert, Outreach Coordinator
NICADD
Department of Physics
Northern Illinois University
DeKalb, Il 60115
sievert@physics.niu.edu
815-753-6418
www.physics.niu.edu/~frontier
/

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Our physics club built a free arm trebuchet to toss watermelons for
Welcome Days this fall.  Here's a "few" pics.  The counter weight is
not adjustable in this initial version, but even so we were able to
toss a variety of melons.  The larger 12-15 pounders lofted high and
landed about 3 meters from the treb and the smaller cantalopes and
honeydews went as far as 90 meters with proper adjustment of the
sling!  Next phase is to get a hardened bar and weight plates to be
able to adjust the counterweight.

href="http://www.physics.niu.edu/gallery/view_album.php?set_albumName=album23">http://www.physics.niu.edu/gallery/view_album.php?set_albumName=album23

(There are also pics of one of our profs demonstrating Kyudo, a
medatative form of traditional Japanese archery.)

Pati

Pati Sievert, Outreach Coordinator


NICADD


Department of Physics


Northern Illinois University


DeKalb, Il 60115


href="mailto:sievert@physics.niu.edu">sievert@physics.niu.edu


815-753-6418


href="http://www.physics.niu.edu/%7Efrontier">www.physics.niu.edu/~frontier







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From peacock@physics.utah.edu Thu Sep 1 13:52:15 2005

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