TM-5-3740-210-12
4.0
CALIBRATION PROCEDURES
The UH-1B/D Helicopter Spray System derives an effective swath width of 200 feet when flown at 75 foot flight
elevation within a forward speed range of 50 to 90 knots. Its rate of application in terms of gallons per acre is based on
the flow rate performance of the system predetermined by the selection and installation of core and orifice configuration
in each of the nozzles on the spray boom and by the windmill pitch setting. The accompanying chart (Table I) defines
the core and orifice configuration that will derive an application rate of water under specified windmill blade angle settings
and helicopter ground speeds.
TABLE I
PERFORMANCE CHART
APPROXIMATE APPLICATION RATE (Gal/Acre) OF UH-1 B/D SPRAY
SYSTEM WITH WATER AT A 200 FOOT SWATH SPACING
Flow
HIGH
MEDIUM
LOW
Nozzles
50 Each D10-56
50 Each D8-45
50 Each D6-45
Speed (Kn.)
50
70
90
50
70
90
50
70
90
Blade Pos.
2.0
3
2 1/4
2
1 1/8
1
1
2/3
2/3
2/3
1.5
3 1/4
2 1/2
2 1/4
1 1/4
1 1/8
1
3/4
3/4
3/4
1.0
3 1/3
2 3/4
2 1/2
1 1/2
1 1/3
1 1/4
7/8
7/8
7/8
22
