252 The UMAP Journal 24.3(2003) Figure 1. The landing platform(graphic from Just'In Designs [2001) As the rider breaks through the top layer of boxes, crashing through card- board at a high horizontal speed, it will be difficult to maintain balance. It is too dangerous to rely on the cardboard to stop the horizontal motion of the rider, unless we use such a large pile that keeping it from being visible to the camera would be nearly impossible We are faced with how to cushion the rider's landing without creating merely a pit of boxes. Imagine jumping from a 10-ft roof. If the jumper lands on a large wooden platform resting on a deep foam pit, the risk for injury much less; the foam spreads out the jumper's deceleration over a much longer time,simulating a much lower jumping height Our goal is to create a landing platform for the motorcyclist that behaves uch like the wooden platform on the foam pit. We simulate the foam pi by stacks of boxes. Our"platform"is constructed from boxes unfolded into cardboard flats and placed in a layer on top of the"pit(Figure 1). The idea is that the motorcyclist should never break through this layer of flats but should merely break the boxes underneath it. Safety Considerations Once the motorcycle has landed on the stack of cardboard boxes, its decel- eration should to be as uniform as possible as the structure collapses-the more uniform the deceleration the easier to maintain balance We want the platform to remain as level and rigid as possible. If it is not level, the rider may lose balance; it it is insufficiently rigid, it may bend and collapse into the pile of boxes Terminology The flute type of a gauge of cardboard refers to its corrugated core structure Three sheets of linerboard compose one sheet of corrugated cardboard; tl middle one is shaped into flutes, or waves, by a machine, and then the outer two sheets are glued on either side of it. For example, C-flute corrugated cardboard is the most common form [Mall City Containers n.d. I252 The UMAP Journal 24.3 (2003) Figure 1. The landing platform (graphic from Just’In Designs [2001]). As the rider breaks through the top layer of boxes, crashing through card￾board at a high horizontal speed, it will be difficult to maintain balance. It is too dangerous to rely on the cardboard to stop the horizontal motion of the rider, unless we use such a large pile that keeping it from being visible to the camera would be nearly impossible. We are faced with how to cushion the rider’s landing without creating merely a pit of boxes. Imagine jumping from a 10-ft roof. If the jumper lands on a large wooden platform resting on a deep foam pit, the risk for injury is much less; the foam spreads out the jumper’s deceleration over a much longer time, simulating a much lower jumping height. Our goal is to create a landing platform for the motorcyclist that behaves much like the wooden platform on the foam pit. We simulate the foam pit by stacks of boxes. Our “platform” is constructed from boxes unfolded into cardboard flats and placed in a layer on top of the “pit” (Figure 1). The idea is that the motorcyclist should never break through this layer of flats but should merely break the boxes underneath it. Safety Considerations • Once the motorcycle has landed on the stack of cardboard boxes, its decel￾eration should to be as uniform as possible as the structure collapses—the more uniform the deceleration, the easier to maintain balance. • We want the platform to remain as level and rigid as possible. If it is not level, the rider may lose balance; it it is insufficiently rigid, it may bend and collapse into the pile of boxes. Terminology • The flute type of a gauge of cardboard refers to its corrugated core structure. Three sheets of linerboard compose one sheet of corrugated cardboard;the middle one is shaped into flutes, or waves, by a machine, and then the outer two sheets are glued on either side of it. For example, C-flute corrugated cardboard is the most common form [Mall City Containers n.d.]