12ft  Yellowtail   7.40012ftYellowtail 400pxW.D.Moore & Co. has been in the windmill business since the 1890's.

Whether your pumping need is for livestock, irrigation, household, de-watering, or a garden water supply, W.D.Moore & Co. has experienced staff to help you with the right choice.

The Yellowtail is manufactured by W.D.Moore & Co. and includes many fine features that make it one of the longest lasting windmills ever produced.

Windmills are proven technology that offers superior benefits over any other pumping system. They can operate in conditions that other systems find impossible, but best of all they outlast all other mechanical methods of moving water. Their demand for maintenance is less, the range of application is greater, anyone can install them, and they use no fuel.



For an obligation free quote on a Windmill system, use the form on the contact page.

We will give you a detailed quotation outlining all the components required for the perfect installation for your site.

Where can a Windmill be used?
Windmills can be used wherever water is required.

  • Stock Water - Sheep, Cattle, Horses, etc
  • Domestic applications - household water for drinking, sanitation, and washing
  • Irrigation - for house and vegetible gardens
  • Filling dams, reservoirs, fish ponds, lakes
  • Dewatering wet lands
  • Removal of salt laden water
  • Water for industry
  • Waste water removal
  • Medication of ground water
  • Sewage
  • Water for schools, public buildings, recreational areas, etc
  • Remote locations

The uses for windmills is only limited by ones imagination. All that is needed is wind.

How much wind do I need?

The wind is a natural resource that is available everwhere. As a general rule the wind blows for between 8 to 10 hours per day, at a speed that is useful for the windmill. This can happen at any time of the day or night - we don't always see the wind blowing.

How do I know how much wind there is?

The following table is called the Beaufort Scale, and is used to assess local wind conditions.

Force

Name

Definition

Speed Range
(M/s)

Speed Range
(KPH)

0

Calm Smoke rises vertically

0

0

1

Light air Direction shown by smoke, but not vane

1

7

2

Light breeze Wind felt on face, leaves rustle

2-3

14-21

3

Gentle breeze Leaves, small twigs, & flags in motion

4-5

28-35

4

Moderate Raises dust and paper, small branches move

6-8

42-56

5

Fresh breeze Small trees in leaf sway

9-11

63-77

6

Strong breeze Large branches move, wires whistle

11-14

77-98

7

Near gale Whole trees move, walking slightly impeded

14-17

98-119

8

Gale Breaks twigs off trees, walking difficult

17-20

119-140

9

Severe gale Slight structural damage

21-24

147-168

10

Storm Trees uprooted, considerable damage

>25

>175

 How much water do I need to pump?

The following table will guide you to determining the volume of water you need the windmill to pump. Use the column titled "Actual Daily Use" to put a number that best suits your need, or use the estimate as a generally accepted number. In the "No. @ Use column put in the number of persons (or animals) using this water supply. Multipy these two columns to determine your daily need. Add up all the numbers in the last column. Once you have added all your "Totals" together you will need to add a safety margin. Usually this margin is between 10 to 50% and it depends on the reliability of the wind resource - a good wind resource will only require a 10% margin, while a light wind regime will need more (to allow for the days when the wind does not blow).

Water Use

Daily Use (Litres)

No. @ Use

Total

Estimate

Actual

Domestic - Drinking (per person)

2

     

Domestic - Hygiene, bathing (per person)

10

     

Domestic - Toilet (per person)

10

     

Domestic - Laundry (per person)

15

     

Domestic - Household cleaning

10

     

Swimming Pool

750

     
         

Machinery Wash-down

100

     
         

Livestock - Domestic animals

5

     

Livestock – Sheep

5

     

Livestock - Cattle (dry)

60

     

Livestock - Cows (milking)

80

     

Livestock – Pigs

10

     

Livestock – Goats

7

     

Livestock - Poultry (per 100 birds)

40

     

Livestock - Turkey (per 100 birds)

70

     

Livestock – Deer

15

     

Livestock – Horses

50

     

Livestock – other

       
         

Irrigation - Flood (per Square Metre)

25

     

Irrigation - Sprinkler (per Square Metre)

25

     

Irrigation - Trickle (per Square Metre)

10

     

Irrigation - Trees

5

     
         

Total - all uses (Litres per day)

 

Diagnosis of Pumping Problems

Symptom

Possible Cause

Recognised by

Pump does not deliver any water

Broken Pump Rod
Plunger Valve jammed open

Windmill turns over easily without lifting any water Water at T piece remains full

Bottom Valve of Pump is jammed open
Bottom end of Suction Pipe above the water
Hole in Suction Pipe above the water level
Suction Pipe blocked
Pump too far above water level (maximum should not exceed 5 Metres)

Water rises and falls at the T piece

Delivery Pipeline is blocked
Pipeline too long
Pipeline diameter too small

Windmill pumps water when Delivery Pipeline is removed

Pump delivering a steady but reduced supply

Worn Pump Cups (seals)

Water level at T piece will stand when the Pump stops

Worn Valves or Valve Facings

Water level at T will drop when the Pump stops

Leak in Discharge Pipe (Rising Column)

Water level drops to leakage point when the Pump stops

Pump delivers a full stream when started, but delivery diminishes or ceases

Bore or well not making enough water
Suction pipe too long
Suction pipe too small
Suction Pipe partly choked
Insufficient waterway in Valves
Partial vacuum below the Pump Plunger

Excessive knocking noise in the Rising Column
Water splashing at T piece
Air bubbles in the Rising Column
Pump Rod appears to be sucked downwards on the down stroke
Hammer in the Rising Column

Windmill requires strong wind to operate

Pump size too large
Delivery Pipeline diameter too small, or too long
Windmill too small for the job
Air Chamber water logged

Windmill ‘rocks’ at the bottom of the stroke (tries to turn, gets part way up the stroke, then winds back again
Hammer in the Delivery pipeline
Pump does not deliver rated flow

Windmill does not appear to face the wind

Windmill Gearbox seized on Pivot Tube
Tower not vertical
Trees or Buildings in the path of the wind
No (or wrong) Oil in Gearbox

Windmill does not pump a full flow in good winds
Tail of Windmill does not run in the expected direction of the wind

Tail of Windmill waves around erratically

Turbulence
Windwheel is not 5 Metres above obstructions within 100 Metres.

Wear in the Tail Pin
Erratic operation
Rated flow not being achieved

Damage to Windwheel

Turbulence (causes Tail to swing into the Wheel)
Broken Hub Shaft (most usually caused by Turbulence
Bearings worn
Windmill too lightly loaded (too big a Mill for the job)
Loose bolts
Windwheel is tied to Tower

Sails broken or missing
Sails hit Tower Main Post, or Furling Unit