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Experimentforcrashedwaterimpact
Asaresultofthepre-experiment，theairpresureisO.16MPaandthequantityofwateris5 literswouldbebestconditiontoobserveforexperimentforwaterimpactofair-dropedwater. Fig.6showsimpactloadofcrashedwateronthegroundmeasuredbyloadceltothenormalized. Maximumloadis10.1kgf/m2• Sincethemaximumimpactloadinarealscaleexperimentwas reportedabout10kgf/mL，thesameimpactloadwasacquiredalsointheexperimentwitha similaritymode.lOtherwise，impacttimeisthequiteshortcomparetotherealexperiment.Itis shownthatsimilarityoftimedependentshouldbeconsiderationforimpacttimeinfluence.For thenextstep，wewouldliketoplanforreducingtheimpactforarangingtheshapeofdischarge holeofwaterbucket.
Conclusions
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Inthisreport，theexperimentwhichcorespondwithasimilarityrulepayingatentiontoFroude numberandWebernumberwasconducted.Forspurtingwaterfromthepresureta叫cwhich imitatedthebucket，thebehaviorofscateringwaterfromthesituationwherethehelicopteris flyingwasreproducible.Inadition，forthesimilarityexperimentaboutthecrashloadofwater ontheground，impactloadwasequivalenttoarealscaleexperiment.Forthefuturework，with theactualfire，wehavetotakeintoconsiderationvariousinfluences，suchasinf1uenceofthe ascendingcurentbyafireflame，anddownwashofahelicopter，peculiarnaturalwindof geographicalfeatures，ands.oon.Inordertoproposetheefectivemethodofaerialfirefighting， asafolowingstep，thesimilarityexperimentwhichimitatedthefireisunderplaning.
Acknowledgements
ThisworkwassuportedbyGrant-in-AidforScientificResearch(KAKENI宜)onInovative Areas"Optimizationofairdropedwaterforfire-fightingingreaturbanfiredisasterwithactive controledwindtunel"(19710158)oftheMinistryofEducation，Culture，Sports，Scienceand Technology(MEXT)，Japan.
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