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We tested our prototype by putting it in the water with the pennies and seeing how far it moved and making adjustments. at some times it held 40g but didn´t move. And sometimes it moved but didn´t hold.
IT WORKED!! at the most part. The rubber band propeller played a huge role in our success.

Data Table:

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We used 10 straws, 2 rubber bands, foil, a bottle cap, masking tape, hot glue, and 2 popsicle sticks.

Our prototype:

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3 rubber bands
10 popsicle sticks
10 plastic straws
4 styrofoam packing peanuts
3 styrofoam pieces
2 small drink lids
1 plastic bag
Unlimited:
wax paper
saran wrap
foil
masking tape
hot glue

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We were supposed to make a boat that could hold 40 grams and move itself 20 inches away.

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Boats and boating--Equipment and supplies