Catapult+Workshop+Page+4

=Session 7:= =The Bulldogs' Challenge=

their catapult as an Onager, using a rope spring...

 * ====[[image:P1270562.JPG width="339" height="241"]]====

a problem...
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spring...
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 * ====[[image:P1270595.JPG width="340" height="244"]]====

twists to create an even force...
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we have to unwind the spring!)
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 * [[image:P1270588.JPG width="343" height="246"]]

Drilling the spring hole through the new side pole...
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Rewinding the spring....
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 * [[image:P1270596.JPG width="344" height="242"]]

the spring pin to increase the twist...
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Range: only 2 metres! Modification time...
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 * [[image:P1270603.JPG width="340" height="244"]]

Range: 6 metres
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Range: even worse! 1 metre
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 * ====[[image:P1270609.JPG width="342" height="254"]]====

Hmm ... try inserting some rope...
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friction over the wooden pole... Failed!
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 * ====[[image:P1270605.JPG width="338" height="227"]]====

reduce the friction... FAILED!
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Problem: The projectile arc is too low...
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 * [[image:P1270614.JPG width="344" height="253"]]

projectile launch...
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pull down the throwing arm...
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 * [[image:P1270621.JPG width="346" height="248"]]

YES! Range: 17.5 metres
|| ====Modifications needed:====

Only 1 week to go!
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The Modifications.... Range: 22 metres!

 * [[image:P1270765.JPG width="374" height="309"]]

System to raise the front...
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acting as a stopper bar...
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 * [[image:P1270794-1.JPG width="364" height="251"]]

Increase the length of the throwing arm...
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Metal plates between the rope spring ends...
|| =Siege Day=