In the current paper two articles were used, both very thorough but unpublished and available only on the Internet: Trebuchet Mechanics by Donald Siano and The Counterweighted
Trebuchet--an Excellent Example of Applied Retromechanics by W.
Other features include counterweighted
flappers, elastomer throat gaskets, stainless-steel pellet deflectors, and lid-mounted sequence valves.
binocular bar allows a range of vertical motion, from just above the horizon to directly overhead.
The roll carriage is counterweighted
, allowing the downward force to be less than half the weight of the roll carriage and lessening the possibility of crushing anything under the roll carriage.
Yagira's is a magnificently controlled performance, its desperation achingly counterweighted
by a child's natural innocence, optimism and ignorance of consequence.