Children at West Woodburn First School, Northumberland designed a Ballista made from K'NEX©. Why not have a go at building one yourself? Use the pictures to help you. Can you improve on their design?
You
will need:Wheels x4
Grey connectors x10
Orange connectors x14
Yellow connectors x2
Red connectors x6
Blue rods x3
Yellow rods x7
Grey rods x4
Elastic band
A short piece of string
Make the ballista base using these pieces.
Grey rods x2
Yellow rods x2
Wheels x4
Red connectors x4
Step
2
Use these pieces to make the arm of the ballista.
Grey
rods x2
Orange connectors x4
Blue
rod x1
Use
these pieces to make the ammunition cradle.
Blue
rods x2
Yellow connectors x2
Orange connectors x4
Loop
the elastic band through the lower yellow connector piece.
Use these pieces to make the support for the arm of the ballista.
Yellow rods x5
Red connectors x2
Orange connectors x6
Loop the top bar through the other end of the elastic band to join the arm to the support.
Join the ballista arm onto the wheel base as shown in the picture.
Tie the piece of string to the top of the ammunition cradle. Place your ammunition in the ballista arm. Your ballista is now ready to fire!
