SPRAY EQUIPMENT FOR HELICOPTERS MICRONAIRMICRONAIR.
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Transcript of SPRAY EQUIPMENT FOR HELICOPTERS MICRONAIRMICRONAIR.
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SPRAY EQUIPMENTSPRAY EQUIPMENTFOR HELICOPTERSFOR HELICOPTERSSPRAY EQUIPMENTSPRAY EQUIPMENTFOR HELICOPTERSFOR HELICOPTERS
MICRONAIRMICRONAIRMICRONAIRMICRONAIR
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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 CONTROLLED DROPLET DROPLET
APPLICATIONAPPLICATION((CDACDA))
CONTROLLED CONTROLLED DROPLET DROPLET
APPLICATIONAPPLICATION((CDACDA))
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Hydraulic Nozzles
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Hydraulic NozzleDroplet 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
64
8
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 MICRONAIR SPRAY EQUIPMENTEQUIPMENT
MICRONAIR SPRAY MICRONAIR SPRAY EQUIPMENTEQUIPMENT
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Typical Spray System
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MICRONAIR MICRONAIR ATOMISERSATOMISERS
ONONHELICOPTERSHELICOPTERS
MICRONAIR MICRONAIR ATOMISERSATOMISERS
ONONHELICOPTERSHELICOPTERS
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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 No Yes
Speed adjustable in flight No Yes
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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ACCESSORIESACCESSORIESACCESSORIESACCESSORIES
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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 MICRONAIR SPRAY EQUIPMENTEQUIPMENT
FORFORHELICOPTERSHELICOPTERS
MICRONAIR SPRAY MICRONAIR SPRAY EQUIPMENTEQUIPMENT
FORFORHELICOPTERSHELICOPTERS
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