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SPRAY EQUIPMENT FOR HELICOPTERS
MICRONAIR SPRAY EQUIPMENT FOR HELICOPTERS
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Micron Sprayers Limited
UK based and owned Established 50 years Inventor of CDA using rotary atomisers 50 employees Sales to over 90 countries Micronair Division on Isle of Wight
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Bembridge Fort
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CONTROLLED DROPLET APPLICATION (CDA)
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Hydraulic Nozzles
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Hydraulic Nozzle Droplet Formation
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Rotary Atomiser
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Rotary Atomiser (CDA) Droplet Formation
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Comparison of Spray Droplets
From standard nozzle From Micronair Atomiser
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Droplet Size & Coverage
Reducing droplet size increases the number of droplets Smaller droplets give more droplets/cm2 than larger droplets Smaller droplets penetrate dense foliage better
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Number of Droplets on Target
1 8 64 512
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Choice of Droplet Size Droplets must be small enough to:
Give good coverage Give effective penetration of foliage But must be large enough to: Not evaporate significantly before reaching their target Not drift out of the target area
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Sensitive Card 1 cm2
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MICRONAIR SPRAY EQUIPMENT
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Typical Spray System
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MICRONAIR ATOMISERS ON HELICOPTERS
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Choice of Atomiser AU5000 – Wind Driven AU6539 – Electric
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Comparison of Atomisers
AU5000 AU6539 Drive method Wind Electric RPM varies with airspeed Yes No Suitable for low airspeeds Speed adjustable in flight Maximum flow/atomiser 23 l/min 3 l/min
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Electronic Speed Control
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AU5000 Atomisers on Mi-2
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AU5000 Atomisers on Mi-2
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AU5000 Atomisers on KA-26
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AU5000 Atomisers on KA-26
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AU5000 Atomisers on KA-26
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AU6539 Atomisers on Mi-8
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Mi-8 Internal Tank Capacity 750 litres
Mounted on attachment points for long-range fuel tanks External filler & vent
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AU6539 Atomisers on B-212
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AU5000 System on Super Puma
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Spray Pod on Dauphin Helicopter
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ACCESSORIES
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Variable Restrictor Unit (VRU)
One VRU used with each atomiser Regulates chemical flow rate to atomiser Installed on spray boom Adjusted on ground
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Variable Restrictor Plates
Fixed restrictor plate drilled with 7 different size holes Rotating selector plate exposes one hole in restrictor plate Selector plate rotated by knob on VRU
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Diaphragm Check Valve Prevents leakage of chemical when atomiser is not operating Opens when control valve is opened and pressure in boom increases Installed on atomiser
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Application Monitor Measures chemical flow rate with turbine in pipe to booms Displays flow and application data Measures atomiser RPM Installed in cockpit
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Application Monitor Functions
Chemical flow rate (Litres/Minute) Volume sprayed (Litres) Application Rate (Litres/Hectare) Area sprayed (Hectares) Spray time (Minutes : Seconds) Work rate (Hectares/Minute) Atomiser RPM
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Flowmeter Turbine
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Flowmeter Turbine Rotor
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Flowmeter Installation on KA-26
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Atomiser RPM Indicator
Measures speed of each atomiser (max 10 units) Allows all atomisers to be adjusted to rotate at same speed Magnetic transducer installed on each atomiser
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Application Printer Prints data from application monitor
Provides permanent record of each spray job Installed in cockpit of aircraft
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MICRONAIR SPRAY EQUIPMENT FOR HELICOPTERS
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