This document provides instructions for creating several homemade devices: 1. A wind turbine generator made from cardboard, dowels, rubber bands, and tape that uses Savonius-style vertical blades to harness wind power. The instructions describe cutting blades and disks, marking angles, and assembling the turbine. 2. A small portable gravitational shield made from a conductive non-ferromagnetic tube and rare earth magnets that are inserted inside to create a field. 3. An improvised measuring device made from common household items like string, a ruler or measuring tape, and weights that can measure the depth of pools or distances without specialized equipment. The instructions explain tying knots in the string and using weights to take accurate underwater

1. Windbelt Redux 21st Century Micro Power Generation
step 1The Frame
I started by measuring the widest window in my house, then I cut a board 52 inches long to fit
and ripped it down to six inches wide. Then measuring in 4 inches from each end I drilled a 2 1/4
inch hole at either end and cut out the middle between them.
step 2Mount the voice coil and magnets
This is pretty easy, pick an arbitrary spot on the center line at one end and use a nail through the
bearing to mount the Hard Drive voice coil, a nut was threaded up the nail to hold the coil in
place, the magnets are secured around the coil with wood screws.
step 3We need a way to attach the belt
I reshaped the heads on the voice coil by filing down and gluing on a couple of pieces of wood
and then a half of a razor blade to give an attachment point for the belt, not elegant but it works
for now
step 4At the other end
we make a bridge for the belt to go over and mount it to the frame. tensioning is accomplished by
means of a tuning peg. The tuning peg is a pencil crammed into a hole
step 5The Belt
I grabbed the first thing available, a video tape. The belt is attached to the head with scotch tape,
and at the other end to the "tuning peg" by scotch tape.

2. Cardboard Savonius Wind Turbine technology
step 1Materials needed
Materials:
a. A large piece of heavy-duty cardboard box
b. 14-inch dowel (or knitting needle, or something similar) to serve as an axis rod
c. 2 small rubber bands
d. Duct tape or electrical tape
e. Hot glue (optional)
step 2Make the vertical paddles
Cut 4 strips of cardboard 4" x 10". These will be the vertical
paddles that catch the wind. Cut two rectangular notches in each
paddle. Each notch should be 3 inches long and just wide enough that
the disk will fit in snugly. These notches will be located 1 inch from either side of the ends of
paddles.
step 3Cut the top and bottom disks of the turbine
You will need to cut two disks 10 inches in diameter. Since I flunked kindergarten, I found this
somewhat of a challenge. Trying to draw a true circle without a decent compass is tricky. Then
after you have drawn it and cut it, finding the true center is also difficult. Here's an easy way to
do it.
1. Cut a 10x10 inch square of cardboard.
2. On all four sides make a mark half way between the edges. That mark will be 5 inches from the
corners on each side.
3. Use a ruler to draw lines that connect opposing 5 inch marks through the center of the square.
Where these lines intersect, that's will be the center of the circle.
4. Use a compass if you have one and jab it into the center and expand it out to end of one of the
radius lines. Now draw a full circle with the compass. I'm not sure school compasses are big
enough to do this. An alternative might be to get a ten-inch bowl or something like that and lay it
over the square and trace the lines. You can also simply eye-ball it and make an arc from the
center of one side the the center of the next. You may not get a perfect circle but I don't think this
is too critical for the model we are making. In the real thing it may throw off the ballance.
5. Now cut the circle.
step 4Draw angle lines on the disks

3. Now for a little geometry. Take a look at the first image. Notice that there is an Angle A and sides
a, b, and c. Side c is the line that we want the paddle to line up with. Where we draw it depends
on angle a. To do a little geometry on this let's cheat and use a web-based right triangle
calculator.
My side b is 5 inches (the radius of the circle) and I chose to make side a 2.25 inches. Accoding
to the calculator, this makes angle A 24 degrees. You can play with this calculator by either
entering side a or angle A as you experiment with different configurations.
Going with my 24 degrees configuration, make a mark along side a 2.25 inches from the center of
the circle and then draw side c. Now do that with the other three radius lines.
After that is done, do the same thing with the other disk.
Notice that there are short cuts in the disk at angle A on each radius line. The pupose of these cuts
is dock the paddle to the disks. The cuts should be about a half inch and should follow the path of
line c.
step 5Attach the paddles
1. Double or triple up one of the rubber bands and push it up the axis rod to within about 2
inch from the top. The purpose of this and the other rubber band is to anchor the rod to
the disk via friction. The also help to keep the turbine from slipping up and down.
2. Push the axis rod down through the center of one of the disks. I suggest that you keep
the side of the disk with the angles drawn facing up for easlier alignment of the paddles.
3. Push the rod through the center of the second disk with the side of the disk with the
drawn angles facing down. Slid the disk up the rod to within about 8 inches of the top
disk.
4. Slide the second rubber band up the rod to within an inch of the lower disk.
5. Push one of the paddles onto upper and lower disks so that the notches on the paddle
dock into the angled notches on the upper and lower disks. You might want to
temporarily tape the paddle into place from the top and bottom.
6. Mount the other three paddles in same way.
7. Push the rubber band on the bottom up the rod so that it sits firmly up against the lower
disk.
8. Now you can tape the paddles more firmly to the lower sides of the disks (the lower
sides if you don't want the tape to show. As an alternative, you could use a glue gun to
glue the paddles in place. Only do this after you have finished testing the turbine in the
wind and are happy with the angles of the paddles

4. A small, portable gravitation shield technology
step 1Find the tube
You need a longish (30 cm - 2 meters, it is perfectly your choice, about 1-3 cm inner diameter )
piece of conductive and non-ferromagnetic tube. Aluminium works well, but before buying it
search the house, it is very likely that you'll find it somewhere. I cut a piece of the hanger rack
from an old wardrobe.
step 2Now the magnets
Now the hardest, bur not really hard part. You have to find a strong rare-earth magnet that fits in
your tube. I really like it with a spherical magnet, but it is left at school, so I used a stack of
ordinary ones instead. They should be able to move inside without touching the tube, but there
shouldn't be more than 2 mm between the magnets and the walls of the tube (it depends on the
strength of the magnet).

5. Improvised Measuring Device
Submitted by: Sarahlene Garrido
Angela Platon
Submitted to: Mrs. Rosario Rosales