Rules
Materials:
1. The bridge is built from 3/32 inch by 3/32 inch basswood or balsawood. 2. Any type of glue may be used. Structure dimensions: 1. The total mass of structure is limited to no more than 30 grams. 2. The span of the bridge must be 14 inches. A maximum of one additional inch may rest on each abutment. The total maximum length from end to end may not exceed 16 inches (14" span + 1" abutment + 1" abutment = 16"). 3. The continuous interior width and height must allow a 2 inch high by 2 inch wide by 17 inch long (or longer) measuring device to pass through one end, the interior, and out the other end completely without obstruction. 4. The structure must allow the 3/4 inch by 2 inch by 10 inch testing block to be placed directly on the road bed for testing without being forced or obstructed. 5. The structure should be placed easily between the abutments, without pressure or twisting by the judging staff. 6. The center of the roadbed must not be blocked, so that the testing rod (0.375 inch diameter) may pass through. The center of the bridge must provide at least 3/4 inch clear vertical passage for the test rod. 7. No part of the bridge may extend more than 1 inch below the level of the testing platform. 8. Laminations are defined as two or more pieces glued together with grain parallel. Lamination may not exceed two (2) pieces. Lamination of more than two pieces will result in disqualification. Students are cautioned not to laminate at small angles to try to technically circumvent this rule
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