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Experiment Manual
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Kit Components
No. Description Quantity Part No.
1 Joint pin 1 702524
2 Axle lock 4 702813
3 Shaft plug 4 702525
4 Anchor pin 20 702527
5 Button pin 24 704062
6 Perpendicular connector 6 704064
7 Washer 6 702816
8 Cotton string 1 702812
9 Light-emitting diode (LED) 1 704072
10 Screw 4 704084
11 Small gear wheel 5 702504
12 Medium gear wheel 3 702505
13 Large gear wheel 1 702506
14 Long axle 3 703518
15 Part separator tool 1 702590
16 Medium axle 2 703518
17 Universal adapter housing 2 704066
18 Universal adapter lid 2 704071
19 Pre-assembled generator 1 704068
20 Battery mount 1 704073
21 Small frame 4 703232
22 Short eleven-hole rod 2 703233
23 Long seven-hole rod 6 703235
24 Extra short five-hole rod 3 704163
25 Large frame 2 703239
26 Cable tie 3 704081
27 Wind turbine blade set 1 704065
28 Aluminum tube 1 704080
29 Connector cable 1 704103
30 Experiment manual 1 704083E
We reserve the right to make technical changes.
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Table of Contents
29
28
The Air Never Rests............6
Renewable Energy ............7
Windmills of Yesterday
and Today ...................8
Your Windmill ................9
Let’s Build the Wind
2223
24
Power Plant .................10
Components and Mounting ....11
6
The First Power Test ..........12
Swift as the Wind ............14
The Wind Performs Work ......16
5
25
The Wind Formula............18
A Wind Experiment: Forces on a
Flat Surface .................19
21
Apparent Wind ..............20
Windy Measurements.........29
How Fast Is Your Windmill
Spinning?.......30
15
Wind Generator
Assembly
Instructions .....32
26
20
5
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28
Adjust the blade angle by
11
twisting the rod mount on
the hub. The angle template
cutouts will help.
angle template
What determines rotation speed?
Rotation speed indicates the number of rotations or revolutions per second or minute.
The following facts determine the rotation
speed:
The wind speed
The size of the windmill
The number of blades
The shape of the blades
The required power
The three angle
templates
for 2 blades
for 3 blades
for 6 blades
Each wing or propeller shape is determined
by a specific lift ratio, or the so-called coef-
ficient of lift (CL). It has a drag coefficient (Cd)
as well. The coefficients of different wing
shapes have been determined in special wind
tunnels. So have the drag coefficients of various automobile bodies and other vehicles.
Airplane model in wind tunnel
Your rotor blades are fairly arched and
intended for a low-speed model. But what’s
slow and what’s fast?
For our experiments, we will have to be able
to determine the wind speed. To do that, we
will assemble a wind gauge.
Experiment
Materials: wind speed scale (cutout), 40 cm of
string (8), joint pin (1)
Cut the wind vane with the wind speed scale
out of the cut-out sheet at the end of this
experiment manual. Guide the string through
the hole, and pull it through the joint pin as
well. Tie its ends together so that the joint
Wind speed scale
Cut out along
the dotted line
Cut out four
holes
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29
Windy Measurements
Small
frame
Measuring
Wind
Scale
Shaft plugs
(3)
Joint pin
String (8)
pin hangs 3 cm below the bottom edge of
the vane. Hide the knot inside the pin and
center it.
The string is the pointer. When there is no
wind, it is on zero. It travels up the scale
depending on the strength of the wind. It
indicates speed in meters/second. (A bicycle
goes about 4 m/s on average.) The wind
gauge isn’t one hundred percent accurate,
but you can use it to compare measurement
results under the same wind conditions.
We cannot change the diameter of our rotor,
nor can we change the shape of its blades.
But we can adjust the number of blades
and the power we want to get from it.
First, we’ll measure the rotation speed with
different numbers of blades and under the
same wind conditions.
Wind speed scale
That works!
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