Lesson 2 Work on creating an anemometer

Students assemble the model according to instructions

1. Assembling a model of an anemometer
2. Assembling speed sensors for an anemometer

Students assemble the model according to instructions

You can additionally offer a mini-competition for the most creative model

Assembly instructions

1. Creating an Anemometer Model

1 | Draw a dotted line 5.5 cm up from the bottom of the cup around the entire circumference		2 | Connect the strokes to make a solid line. Cut the cup along the line.
3 | Make two holes using a pushpin, directly opposite each other, 2cm from the bottom of the cup.		4 | Label this cup as a template
5 | Place other cups into the template. Draw a line along the edge of the pattern, then cut and punch holes in each remaining cup along the line.		6 | Poke two holes in the straw with a craft pin, 0.5 cm from the end. The holes should be directly opposite each other.
7 | Insert a skewer through the holes.		8 | Repeat step 6, making the holes slightly lower than the first, offset by 90° to create an X when inserting the second skewer.
9 | Remove the skewers from the straw. Mark 24cm and cut both ends from the blunt end, scoring and snapping along the notch. Discard the sharp end.		10 | Attach the wind cups, arranging them so they all face the same direction, and attach the cups to the skewer using hot glue.
11 | Use the tip to melt a smooth hole in the bottom of the cup, wide enough for a straw to fit through.		12 | Glue the spool to the center of the plate, avoiding any glue getting into the hole.
13 | Place a plastic cup in the center of the coil and plate. Insert and align the wind cups and straw. Glue the edge of the cup to the plate.		14 | Test it by blowing on the cups to make sure it rotates easily.  You have completed the basic anemometer. This will also be used later!

Determine wind speed manually

1. Make a mark on one cup to make it easier to count the revolutions.

Measure the wind speed outdoors or use a hair dryer or fan. Using a stopwatch, count how many times the symbol passes a certain point within 10 seconds

.2. Number of revolutions: To calculate the number of revolutions per second, divide the number of revolutions by 10.

Revolutions per second: Now determine the circumference of the rotation (3.14 x diameter of the wind bowl structure). Diameter is the length of the skewer connecting the two wind cups

3. Circumference of rotation: To determine the distance (in cm) traveled per second, multiply the number of rotations per second by the circumference.

4. Distance traveled per second: To determine the distance (in cm) traveled in 1 hour, multiply the distance traveled in one second by 3600.

Distance traveled in one hour: To convert this to km/h, divide the distance (cm) traveled in one hour by 100,000. This will give you the wind speed in km/h.Wind speed in km/h

Fill the table:

How many revolutions in 1 second,COUNT	Circumference,C	Distance (in cm) traveled per second,COUNT * C	Distance (in cm) traveled in 1 hour,(COUNT * C) *3600	Distance in km/h,((COUNT * C ) *3600)/100 000

2. Add a sensor to detect speed

1 | Make two small parallel cuts at the end of the straw.		2 | This will serve as the setting for the reed switch.
3 | Insert the reed switch into the slots and secure with tape. Bend both wires down. Be careful as the reed switch is very fragile.		4 | Then tape this straw to the base of the plastic cup. The top part should be located just below the skewer so as not to interrupt the movement.
5 | Glue the magnets to the skewer so that they go directly over the reed switch. Adjust the straw band as needed. A faint clicking sound is heard as the magnets pass over the reed switch.		6 | Finally, connect the alligator clips to the two wires on the reed switch.