18+ acres in most vineyards



                 Phone 02 6100 3005                   or 0428221848           

Based in NSW                                       but sell all over Australia                       

                                Email:                           sales@chinookfrostfansaustralia.com

Protect your crops with the Best Frost Protection on the market.



Chinook frost fans cover more ground, wider area, longer duration and can cover over 18+* acres *depending on the height and density of the crop.

Chinook Frost Fans protect the fruit bud longer and better.

Chinook Frost Fans move larger Volumes of air, with a more immediate temperature rise!

Don’t believe us? If you have a frost Fan try our Blade swap challenge. You will be blown away by how much more air it moves.

Chinook fans are not only, competitively priced. They have a 100% satisfaction guarantee. Buy one of our blades and use it for one year, if it does not improve the scope and reach of your towers frost protection we will not only refund your money, we will put your old blade back on free!













What is a Frost Fan? In America, they are called wind machines. They will protect your vineyard, orchard or grove from frost damage.

What are some of the crops susceptible to frost damage? Frost can damage the bud of a fruit or nut tree before it forms into the fruit or nut. Chinook Frost Fans in vineyards or orchards are the best frost protection on the market.

Chinook frost fans move a larger volume of air, for a more immediate temperature rise!

   Acres per sector

Why does Chinook Protect More Acres?

Chinook fans have improved aerodynamics – 80° sector angle!
The aerodynamics of the Chinook blade makes it different from other blades. While other Fan blades
move air within sector angle coverages of 45-60 degrees, the Chinook prop widens the sector angle
circle of coverage to 80 degrees, significantly increasing the velocity and movement of air on the ground
where coverage is needed. Even an increase of air movement directly under the tower is very noticeable.

Chinook fans cover more ground, wider area, and longer duration,15+ acres in denser trees to 18+ acres in most crops!

Numerous field comparison tests have been performed comparing the Chinook blade with competitive blades that do not have the trailing edge wedge. In all scenarios, the Chinook blade has performed
better, with increased velocity, covering more ground, over a wider area, and for a longer duration of
time during each rotational cycle, with no increase in horsepower usage. Chinook fans conservatively
cover 15+ acres in mature tree fruit, 18+ in lower growing crops. Compared with competitive fans of
the same horsepower, the Chinook fan will protect approximately 100-150 feet more on the radius.

Chinook fans protect the fruit bud longer and better!

Under normal radiation frost conditions, ice nucleation begins to form after 4 minutes of no air movement. Whereas other competitive fans return to the plant tissue within 4 minutes, the Chinook
fan is back protecting the fruit bud/plant in 3 ½ minutes. The air movement on the plant tissue has
increased from 35 seconds to over 60 seconds for each 4 ½ minute gear head rotational cycle with the
Chinook fan. Chinook’s wider sector angle coverage mixes air not only in the horizontal plane but also in
the vertical plane. This advantage gives you additional plant tissue protection even on uneven ground
up to 3 ½ – 4 degrees with no special add-on equipment.
Chinook fans move larger volumes of air, more immediate temperature rise!
Drawing warmer air from the upper atmosphere with increased sector angle helps to raise the
temperature on the orchard floor more quickly than with other prop styles. This can be advantageous
when trying to get units started in already cold pockets. In one documented test, the Chinook fan blade
created 3,857,187 CFM compared with 1,733,362 CFM of another competitive fan blade. This is over 2
times more volume of mixed air with the Chinook fan.
Chinook fans – your best value for dollar spent

Chinook fan blade will protect 15+*acres (6.07+ hectares) in mature tree fruit and even more for lower growing crops such as grapes, blueberries, kiwis, strawberries -18+*acres (7.28 hectares).

*Depends on the density and height of the crop.

The aerodynamics of the Chinook blade is different from other blades. While other fan props move air with sector angle coverage of 45-60 degrees, the Chinook prop widens the sector angle circle of coverage to 80 degrees. In Aeronautics this is sometimes referred to as, the ”flow field”.

The Chinook blade is constructed from composite fibreglass; a machine made into one piece. The blade, with steel teeter hub attached, weighs only approx. 45 kg. This low weight and one-piece form provide for smooth running, vibration-free operation. An advanced airfoil design, developed by NASA engineers, is incorporated into each blade featuring a trailing edge wedge, that increases air movement, and Dornier swept tips to reduce drag and air turbulence that builds up at the ends of the fan blade tips. These features work together to produce more air movement, with wider area coverage for a longer duration of time. As a result, the total surface protection is increased. 

The fewer blades a fan has the more efficient they are.

The singular advantage of propellers with 3 or more blades is they allow the RPM to be reduced. This lowers tip speed and hence the noise but comes at the cost of efficiency.

The wake of the blades on multi-blade Fans slows tip speed and efficiency but some competitors are willing to sacrifice efficiency to decrease noise.

Where no noise concerns exist, most growers choose to use the more powerful and efficient 1 piece blade design for the extra reach and temperature lift provided.


The one-piece blade is more efficient

At the heart of any wind machine or frost fan is its fan blade.  Extensive research and development have been spent with the Chinook fan blade, to achieve maximum performance, better efficiency, higher strength, and lower weight.

The Chinook blade is one piece, machine-made, constructed from composite fibreglass.  The blade, with a steel teeter hub attached, weighs approximately 100 lbs. The Chinook blade is constructed with low weight – high strength composite materials. The airfoil begins a close 14” from the hub centre; improving airflow efficiency over the entire blade with very little dead air space.

Incorporated into each Chinook blade is an advanced airfoil design, trailing edge wedge, and Donier swept tips. These unique and distinct features work together to increase air movement velocity, increase sector angle area coverage, and increase the fruit crop’s protection time.  The total number of acres protected by a Chinook fan prop surpasses other fans that do not have these features. 

Designed by NASA engineers

The Chinook advanced airfoil design was developed by NASA engineers to reduce air resistance and improve fan efficiency.  This improvement has increased total coverage of the Chinook fan blade to 15+ acres (6.07+ hectares) in mature tree fruit and even more for lower growing crops such as grapes, blueberries, kiwis, strawberries – 18+ acres* (7.28 hectares).

*Results vary with the type of crop and temperature of the inversion layer

Growers have proven, in actual field usage, that the Chinook fan blade will protect an additional 80-150 ft. (24.39 – 45.73 meters) radius up-drift, beyond the reach of other competitive fans when placed on the same unit, run at the same RPM and utilizing the same engine vacuum draw.

An exclusive and unique fixed wedge is moulded into the trailing edge of each Chinook fan prop.   

The wedge functions much like the wing flaps of an aeroplane when used on takeoff and landing.  At slower speeds, the aeroplane wing flaps come down creating a wedge along the trailing edge of the wing, increasing the air velocity movement under the wing and thus increasing its lift; helping to keep the plane up in the air or to get off the ground quicker. With more lift comes increased velocity. With increased velocity, air movement distance is increased. 

The Chinook fixed wedge performs in like manner.  As you move from the tip of the fan blade to the centre hub, the fan’s rotational speed is turning progressively slower, generating less and less air movement.  The incorporation of a fixed wedge along these slower portions of the blade increases the amount of lift, which increases air movement both velocity wise and distance wise over the entire blade.  

The width of the sector angle (width of the piece of pie and/or amount of air mixing from the fan at any one time) is increased.  Even the air movement directly under the wind machine tower is affected and increased; whereas, competitive fans have a noticeable dead air space under the fan.  The trailing edge fixed wedge will directly increase the amount of air movement over non-wedge blades of the same horsepower input.  

The Chinook fan fixed wedge widens the sector angle coverage. At any one time, the Chinook fan prop has an 80° sector angle coverage, compared to 45-47° coverage of other fans.  The 80° sector angle works not only on the horizontal plane but also, on the vertical plane by reaching higher up in the atmosphere pulling down warmer air; helping to raise orchard floor temperatures quicker. 

Greater sector angles are better, giving less time for the cold air to resettle and start to do frost damage. Whereas other units have 30-35 seconds of fan coverage on every 4 ½ minutes rotational cycle, the Chinook prop has 60 seconds of fan coverage on each rotational cycle.  Ice nucleation (frost damage) begins to form after 4 minutes of below critical temperatures.  The Chinook fan prop returns to the fruit bud in 3 ½ minutes. 

Donier swept tips are used on the ends of the Chinook fan to reduce tip drag and smooth out the air turbulence and vortices that build up at the ends of the fan blade tips. Reducing this turbulence and the size of the vortices (air drag) improves the airflow efficiency.