When thinking up ideas for lighter fins we considered various handy
| material | mass | area | mass/area |
|---|---|---|---|
| 3x5 cards | 1.9 g | 3"x5" = 15 in2 = 97 cm2 | 0.02 g/cm2 |
| coaster | 6.2 g | 4"x4" = 16 in2 = 103 cm2 | 0.06 g/cm2 |
| plastic plate | 38 g | π 5" = 78.5 in2 = 506 cm2 | 0.075 g/cm2 |
| thin foam core | 22 g | 742 cm2 | 0.03 g/cm2 |
| balsa wood | we don't have any | ||
| egg carton styrofoam | 8.4 g | 8" x 11" = 88 in 2 = 568 cm2 | 0.015 g/cm2 |
| package plastic | 9 g | 316 cm2 | 0.03 g/cm2 |