Hi guys,
If you are a part of the blade design group, you will need to bring to the meeting one new blade design. Of your design, you will need to follow these directions:

1. Draw a 8 inch diameter circle (4 inch radius) on a sheet of paper using a compass (圆规)
2. from the center of the circle, draw two perpendicular lines running through the center
3. You should now have four congruent quarter circles

4. Trace out your design on one quarter circle (you only need one paper trace-out)
5. find some cardboard
6. use the paper trace-out to cut out 4 of the same blade designs
7. Bring the blades to the meeting to test them
Your blades should only be at most 4 inches in length
Please bring 4 blades. This is so we can change the number of blades that are being tested.

Here are some questions to get you started:
What is the shape of your blade?
Is the majority of the mass in your blade at the tip or in the center?
Is the blade itself large or small?
You can turn these knobs and see what happens to the energy conversion during the meeting.

Parents: If your child needs help setting the drawing the quarter circle or cutting the cardboard, you should help them. But please allow your children to design their blades themselves.