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Old 18th Jan 2020, 08:06
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chute packer
 
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https://volunteerfirefighters.org.au/water-bombing-and...

In particular this part.
"My frustration over all this is made more acute by re-reading the analysis of the trials of the DC10 VLAT by the CSIRO. After a number of water dropping trials, the CSIRO concluded:

Most of the drops featured a distinct pattern of break-up of the drop cloud in which a series of alternating thick and thin sections could be seen. The resulting drop footprints exhibited a corresponding pattern of heavy and light sections of coverage. Many of the light-coverage sections within the footprints were observed to allow the fire to pass across them with minimal slowing of spread rates.
Two drops delivered in open woodlands (as opposed to heavy forest) penetrated through the canopy and provided a good coverage of surface fuels. One of these drops rained gently through the canopy under the influence of a headwind. Another drop caused severe damage, snapping off trees …This drop could have potentially injured people or damaged buildings …
The CSIRO scientists also looked at the effectiveness of the DC10 dropping fire-retardant chemicals in the forest across the path of the headfire, a technique frequently recommended by supporters of aerial tankers. They concluded that this approach would only succeed for very low intensity fires, due to the ease with which a more intense fire would “spot” over the retardant line.

Overall, the CSIRO’s conclusion of this study was that:

…on the evidence collected, this aircraft is not suitable for achieving effective [bushfire] suppression under most Australian conditions. "
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