acepiercinghydrofoilscanimprovethestaticstabilityofhyswaswithfixedhydrofoilswhenfoilborne;
(2)thehyswaswithfixedhydrofoilshasaminimumratiooflifttobuoyancyonfoilbornetosatisfythestaticstability;
(3)thestaticstabilityofhyswasontraitionisthepoorestthanthatofonfoilborneoratrest.
fromtheliteraturepublishedintheworld,theresearchworkonstaticstabilityreferedinthisdiertationisthefirst.
4.theresearchondynamicstabilityofhyswas
ahyswasissomewhatlikeanairplaneintheairwhenitruonfoilborne.asthewaterplaneareaofhyswasonfoilborneisverysmallandthecenterofgravityisusuallylocatedwithintheuerhull,itismuchhigherthanthecentroidoflowerhull,thefactorsmakethedynamicstabilityofhyswaswhenfoilbornesimilartoormoreseverethanairplane.basedonthispoint,thediertationresearchestheseveralproblemsasfollows:
(1)introducingthemethodthatanalyzesthedynamicstabilityofairplanesintheaviation,thesmallperturbationnon-dimeionallinearizedmotionalequatioweredevelopedindetailbasedonthesmallperturbationtheoryandquasi-cotantaumption,thedistinguishingruleandqualityjudgementcriteriaofdynamicstabilityaresetupinthissection.
(2)thecalculationmethodofeachstabilityderivativewasdevelopedindetailbasedontheanalysisonthemeaningsofderivativesandtheirmechanismofproduction.
(3)thecurativesolutiontoutablehyswashasbeenpresentedandtherelevantc

alculationalresultshaveproveditsreliability.
(4)coideringthenondeterminacyoncalculatingtheinertialquantitybecauseoftheuncertaintyofweightdistributioninpreliminarydesign

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