The Aermotor Windmill

In 1933 the Aermotor Company of Chicago redeveloped their 602 model windmill, and produced the 702 Model. This redevelopment incorporated such features as Replaceable Bearings, Screw-in Wheel Arms, and machine-cut Gears.

The 702 Model is now imported from Argentina, and is modified to suit the Australian towers. The high quality standards set by the original Aermotor are evident in this new windmill.

  • The Wheel, created to the latest  design concepts, has exceptional strength. The round Wheel Arms are screwed directly into the hub, providing exceptional rigidity. 

Sails of galvanized iron sheet have a scientifically-calculated curve that is designed to give a perfect rotational balance. The Aermotor pumps more water in lighter winds.

Replaceable Bearings of anti-friction white metal have a  great resistance against wearing (greater than that provided by conventional bearing systems), and they are also very easy to change.

Double Gears, Pinions and thrust-type Ball-race balance the operating load to operate efficiently with minimum wear. In addition, Gears and Pitman Arms are designed to be easily changed. The optional "short stroke" allows for a greater pumping depth. 

Lubrication ring - a complete but simple "lubrication system" that carries oil to the shafts, the Pitman Arms and the Guide Roller. 

Rotational support  by a thrust-type ball-race allows just the softest wind to activate the Tail and orientate the Windwheel towards the wind.

Band-type brake wraps around the Hub to stop wheel rotation, and simultaneously closes the Tail. 

Limited maintenance requires a change of oil and a general inspection only once a year. 

Vane Spring Adjustment allows the windmill to be tuned to the water demand.

Buffer Device  softens the natural governing action of the Furling system.

Technical Specifications

MODEL WHEEL DIAMETER WEIGHT (Kg) PUMPING STROKE Gear Ratio R.P.M. a 20Km/h. STROKES per minute at 20Km/h.
LONG mm SHORT mm
6 ft 1.8 Mtrs 93 135 91 3.92:1 92 34
8 ft 2.4 Mtrs 153 190 147 3.29:1 132 28
10 ft 3.0 Mtrs 286 243 179 3.29:1 83 25
12 ft 3.6 Mtrs 470 285 208 3.50:1 71 21
















Aermotor Windmill - Pumping Performance
(based on 10 hours of wind per day)

Pump Size

Inches

2"

2.1/4"

2.1/2"

2.3/4"

3"

3.1/2"

4"

Millimetres

50.8mm

57.1mm

63.5mm

69.8mm

76.2mm

88.9mm

101.6mm

6ft (1.8 Mtr)

Feet

95

77

65

56

47

Metres

29

23

20

17

14

Avg. Galls per day

1080

1500

1870

2210

2670

Avg. Litres per day

4900

6820

8500

10050

12140

8ft (2.4 Mtr)

Feet

140

112

94

80

68

50

39

Metres

43

34

29

24

21

15

12

Avg. Galls per day

1580

2170

2710

3210

3920

5330

6920

Avg. Litres per day

7180

9870

12320

14600

17820

24230

31460

10ft (3.0 Mtr)

Feet

215

170

140

120

100

76

58

Metres

66

52

43

37

30

23

18

Avg. Galls per day

1580

2170

2710

3210

3920

5330

6920

Avg. Litres per day

7180

9870

12320

14600

17820

24230

31460

12ft (3.6 Mtr)

Feet

320

250

210

180

155

115

86

Metres

98

76

64

55

47

35

26

Avg. Galls per day

1580

2170

2710

3210

3920

5330

6920

Avg. Litres per day

7180

9870

12320

14600

17820

24230

31460


"Feet" & "Metres" is Total Dynamic Head - the height from the water source to the delivery tank including Friction Loss.
For rain fed dams add 4 Metres to the height to allow for seasonal losses.
Flow rates are shown in Gallons (Galls) and  Litres per Day.  If local wind conditions are light then divide by 10 (for litres per hour) and then multipy by the  number of hours you expect the wind to blow.


Components

Main Casting Brake
Made of grey iron, also used for machines and engines with high requirements. This extraordinary solid casting guarantees a long lasting body. Moreover, a cover made of galvanized iron sheet closes the gear box hermetically so as to protect it from rain and dust.
Due to its great capability, the oil pan is able to contain a big amount of oil to assure a good permanent lubrication
frenoThis brake is a friction band kind and works over the hub of the windwheel in order to avoid movements in the wheel when the windmill is turned off. It closes off with  the windmill tail.
Buffer Device
It prevents strong shocks while releasing the windmill brake.
Hub & Shaft Thrust Bearing

Made of cast iron & special steel, it is positioned into long white metal bearings in the main gearbox. It includes a mechanism to assure permanent lubrication.

crapodinaThis pillow block, which functions as a journal bearing, consists of two rings mounted either side of small iron balls that rotate in a grooved track, giving the windmill more sensitivity. Just the softest breeze will cause the mill to face the wind.
GEARS Windwheel
Made of grey cast iron. Because of their high precision milling, the cogs have more surface contact. This characteristic guarantees longer lasting performance,  and soft and silent running High level design and exceptional performance  
typify these galvanized iron sails. Their curves - scientifically conceived - and the individual balance of each sail, result in a perfect rotational balance. The accurate slope of the sails provides greater efficiency to the Wheel. Since the Wheel Arms are screwed, they allow a perfect alignment of the wheel
Pitman
They are also made of grey cast iron. Their design makes it easier to change the stroke. The Long Stroke for normal pumping, the Short Stroke for higher heads or reduced flow.
Oil Ring Tail

It carries up abundant oil to the Crosshead Shaft, Pumprod and Guide Roller. This ring is a very simple "automatic lubrication system". It replaces oil pumps, springs and all the mechanisms that not only complicate windmills, but which are also likely to wear out. You only need to  change the oil once a year.

Made of galvanized iron sheet, with a strengthening vane throughout. The assembly, supported by the Tailbone, assures maximum rigidity. The whole mechanism of the tail is pivoted on a strong supporting axis. The tail dimensions and weight are proportional to the wheel in order to achieve an exact balance. This  makes the windmill react easily to  the intensity and direction of the wind.


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