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374
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Bucketvol.600L Hitprobability 10 0%
FlightspedCoveragearea 一 oknots 47m2
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Dropinterval(min.) Fig.12.Ther巴lationbetweentheextinguishingtimeandthereleaseintervalsforthebucketvolumeof600and53001withairsp巴 d asparameters.
SA365Nl)withthehelibucketcapacityof601wereused. Thenumberoffl.ightswas20，theairspedrangedfrom0to 24knots(4.4km/h)，andtheflightheightrangedfrom86 to 14 4ft (from 26.2 to 43.9m). In the second experiment， large helicopters (CH47J9) with the helibucket capacity of 601wereused.Thenumberoffl.ightswas5，theairsped rangedfrom0to25knots(46.3km/h)，andthefl.ightheight ranged from 147 to 160丘 (from 44.8 to 48.8m).The relationswhichweobtainedinourexperimentsbetwen coverageareaandcoveragelevelofdropwaterfromboth rnid-sizeandlargehelicoptersshowsimilartendenciesas thedataprovidedbyUSDAForestService，WildlandFire
Chemical Systems，though desired coverage area and coveragelevelforsupresingurbanfiresdiferfromthose forwildfires.
In the first experiment，the duration of the mock-up house fire was divided into the thre e stages: the fire expansionstageofabout30minfromignitionwhenthe fl.amesgatheredstrength;thefirematurestagebetwen30 and 60min after ignition in which the fire continued burning stably; and the fire decline stage after that. In thefireexpansionstage，thefirewasefectivelysupresed bywaterdrop，whichwasclearlysenbythesharpfalof the temperature of the burning houses. However，the
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