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SIEGE
ENGINES
MANGONEL or ONAGER
This
is a torsion catapult. The throwing arm is joined to the frame with a
twisted loop of string. When the arm is pulled back the twist is increased
and this bends the frame side members. When the arm is released the wood
straightens causing the string to 'unwind' forcefully. No elastic is needed,
The mangonel works very like a longbow.
See the Technology Box One' models for a simpler design.
This is another torsion catapult. It is very similar to the mangonel model above, but it has two throwing arms fitted to an elongated frame. A 'bowstring' is fastened to each arm. The most complicated part of the model is the mechanism that draws back the string, locks it and relaeses it when required. All this can be omitted, leaving the string to be drawn back by hand.
By far the most popular model siege engine. Powered by a falling weight it is an elegant and efficient machine. Although a cup could be attached to the end of the throwing arm in place of the sling, you will find performance is greatly reduced. "A sling's the thing!"
This model, like the others on this page, is built using 10mm square section softwood, and the frame stands about 30cm high. The weight is a spent 'D' size dry cell battery, encased in lolly stick planks! It doesn't throw a pebble very far but it makes a reasonable demo model. Experiment! ( The button 'EXP' gives access to limited building instructions.)
Schools can obtain full
building instructions for these models, and others, from
HISTORIC SCOTLAND.
We notice that many of
you come directly to this page - let's face it , you're looking for siege
engines!,
but may we invite you to explore the rest of the site before you leave. Thanks. Dick &Len
but may we invite you to explore the rest of the site before you leave. Thanks. Dick &Len