Material and Shape Selection of main spar For Human Powered Aircraft . main spar weight = 9222.2grams, What did you do t

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Material and Shape Selection of main spar For Human Powered
Aircraft .
main spar weight = 9222.2grams, What did you do to reduce the
weight of the main spar weight below 9222.2grams? How did you
reduce the weight? What were the engineering reasons that your
weight reduction strategy not considered by the MIT team?
1)AAA (please name) is the best material choice amongst the list
of choice for main spar .AAA is lighter than the reference
material by XXX%.
2)BBB (please name) the best shape amongst the list of materials
in shape. BBB lighter than the reference shape by YYY%.
3)DDD-shaped CCC is the best combined material and shape choice
amongst the total list of material of choices. DDD shaped CCC is
lighter than the original named component by ZZZ%
Mass Comparison Table for Structure
Picture of New NAMED Component
Mass of reference material R
Mass of alternate material A
Mass of alternate material B
Mass of alternate Material C
Pic of reference shape 0
Pic of Shape 1
Pic of Shape 2
Pic of Shape 3
Pic of Shape 4