Brinly-Hardy ST-151BH, ST-251BH Towing Vehicle Requirements, Calibration of Speed, Example

OPERATION

TOWING VEHICLE REQUIREMENTS

The lawn sprayer requires towing equipment with a 12-volt battery and charging system, and a towbar hitch in order to operate prop- erly.

The towing equipment should have operable brakes capable of controlling the loaded sprayer and towing vehicle.

CALIBRATION OF SPEED

By measuring off a distance of 50 or 100 feet, the speed of the tow- ing vehicle can be calibrated by selecting a gear and throttle posi- tion to cover the prescribed distance in the specified time as shown:

Speed (mph)	Seconds required to travel
	50 feet	100 Feet
2	17	34
3	11	22
4	9	17
5	7	14

CALCULATION PROCEDURE FOR SPRAYER APPLICATION

Chemical labels normally show application rates in gallons per acre or gallons per square feet. Using the following method, one can determine the appropriate amount of water to use and speed to travel to adequately follow the manufactures recommended instructions.

1.Based on the size of your yard, select the amount of water to be used. Use the formula:

Application Rate x	Area to be sprayed = Amount of water
(from the Table1).
Example 1	Example 2

Yard Size= 4 acresYard Size= 20,000 sf

Using the Table 1 and the above formula:

56.5 gal/ acre x 4acres= 225.6 gal@ 2mph	1.3 gal/ 1000 x 20,000sf= 26 gal@ 2mph
37.5 gal/ acre x 4acres= 149.6 gal@ 3mph	0.9 gal/ 1000 x 20,000sf= 18 gal@ 3mph
28.0 gal/ acre x 4acres= 112.0 gal@ 4mph	0.6 gal/ 1000 x 20,000sf= 12 gal@ 4mph
22.5 gal/ acre x 4acres= 90.00 gal@ 5mph	0.5 gal/ 1000 x 20,000sf= 10 gal@ 5mph

2.Choose the speed / amount of water you want to use.

Example 1	Example 2
A comfortable speed	Since 18 gallons can be
for a lawn tractor is	done with only one filling:
3 mph.
Choice = 149.6 ~ 150 gal@ 3mph	Choice = 18 gallons @ 3mph

3.Determine how many tanks are required to complete the total job:

Amount of Water / Tank Capacity = Number of tanks from Step 1.

If the number of tanks is less than 1.0 use 1.0

Example 1	Example 2
150 gal/ 25 = 6.0 tanks	18 gal/ 25 = 0.7 tanks use 1.0 tank

4.Determine how much chemical is to be used:

Rate From	Area to be	Amount of
Manufacturer’s Label X	Sprayed	= Chemical Required

Example 1	Example 2
Label = 20 ounces/acre	Label = 1/2 pint/ 1000 sq. ft.
20 oz. x 4 acres = 80 oz.	1/2pt/1000 x 20,000 sf = 10 pints

5.Determine how much chemical per tank:

Amount of Chem	# of Tanks	Amount of
(from Step 4.)	(from Step 3.)	Chemical per tank

Example 1	Example 2
80oz./ 6.0 tanks = 13.3 oz./tank	10 pints/ 1 tank = 10 pints

L-1914 Rev. B 16.