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Estimating Methods, Variability, and Sampling for Drop-Test Data
Six drop tests numbered 201 to 206 were made over the grid and the results collected on July 12, 2001. Table 4 shows the data collected and the calculated line lengths (longest continuous segment). The actual volumes for drops 201 and 202 were not measured. The measured volumes were obtained using a flow meter when the tank was being filled. There was no way to measure volume dropped or the actual flow rate. For this reason, percent recovery was not included in this table.
The flow rates shown are also a target. No usable flow-rate data were recovered from this drop test. The two numbers for height and speed were provided by the military. For height, one number is from a radar altimeter and the other is from the self-contained navigation system. For speed, one number is from a pitot tube and the other is from the self-contained navigation system. The Forest Service measured height and speed using video analysis.
| Drop | Volume in tank (gallons) | Time | Target flow rate (gallons per second) | Height1 (feet, Forest Service) | Height2 (feet, military) | GS1 (knots, Forest Service) | GS3 (knots, military) | Wind (miles per hour) | Wind direction (0 degrees headwind) | Temp (°F) | Relative humidity (percent) | Fire-fighting chemical | Density (grams per cubic centimeter) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201 | 9004 | 10:31 a.m. | 250 | 159 | 170/160 | 129 | 133/132 | 4 | 45 | 70 | 56 | H2O | 1.000 |
| 202 | 9004 | 11:08 a.m. | 250 | 149 | 150/150 | 128 | 136/131 | 4 | 320 | 73 | 52 | H2O | 1.000 |
| 203 | 871 | 11:41 a.m. | 250 | 167 | 160/160 | 132 | 130/138 | 2 | 95 | 74 | 50 | GTS-R | 1.094 |
| 204 | 877 | 12:17 p.m. | 250 | 144 | 140/150 | 134 | 132/124 | 5 | 130 | 78 | 45 | GTS-R | 1.097 |
| 205 | 958 | 2:56 p.m. | 500 | Missed | 160/150 | Missed | 133/133 | 0 to 5 | Missed | Missed | Missed | GTS-R | 1.096 |
| 206 | 821 | 3:37 p.m. | 500 | 157 | 160/160 | 143 | 138/131 | 4 | 130 | 89 | 29 | GTS-R | 1.095 |
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| 1 The Forest Service measured height and
ground speed using video analysis. 2 The military measured height using a radar altimeter (first value) and a self-contained navigation system (second number). 3 The military measured ground speed using a pitot tube (first value) and a self-contained navigation system (second number). 4 The actual volumes for drops 201 and 202 were not measured. The target volume was 900 gallons. |
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| Length of the retardant line at specific coverage levels (in gallons per 100 square feet, gpc). | |||||||
|---|---|---|---|---|---|---|---|
| Drop | 0.5 | 1 | 2 | 3 | 4 | 6 | 8 |
| 201 | 600 | 521 | 218 | 122 | 105 | 26 | 25 |
| 202 | 600 | 485 | 375 | 100 | 73 | 14 | 0 |
| 203 | 600 | 570 | 457 | 185 | 80 | 38 | 21 |
| 204 | 593 | 524 | 275 | 202 | 118 | 39 | 28 |
| 205 | 513 | 479 | 373 | 174 | 97 | 68 | 12 |
| 206 | 511 | 477 | 356 | 190 | 73 | 28 | 0 |
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