We investigated the lifting properties of helium balloons (lighter-than-air craft) and then tried to recreate some of the thinking behind the Wright brothers first 'heavier-than-air' craft. We discussed what was necessary for a plane to maintain a controlled flight and decided that a rigid, stable, lightweight, aerodynamic shape with wide wings for maximum air resistance was the winning recipe. Well done to PM, OJ and AB for their winning design, using tracing paper and a hint of tape. 
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