De­si­gn: Ae­ro­dy­na­mic Lift - A2V’S Ou­tlook

It is dif­fi­cult to call her a boat but A2V is ne­ver­the­less a boat. Her stran­ge shell sha­pe al­lo­ws her to ex­ploit eve­ry boat’s con­di­tion whi­ch means being si­tua­ted on a pla­ne di­vi­ding wa­ter and air.

Superyacht - - Contents - by An­drea Man­ci­ni

Any boat ya­cht or ship tra­vels on a pla­ne whi­ch se­pa­ra­tes two fluids: wa­ter and air. Other con­ven­tio­nal ve­hi­cles su­ch as trains, air­craft, mo­tor cars do not share this uni­que con­di­tion per­tai­ning to wa­ter craft sin­ce they mo­ve th­rou­gh air alo­ne. On one hand when two fluids are in­vol­ved they de­ter­mi­ne wa­ve for­ma­tion whi­ch ine­vi­ta­bly cau­ses drag ef­fect to wa­ter craft or re­si­stan­ce to for­ward mo­tion when in head seas, but on the other hand wa­ve trains can pro­du­ce an ad­van­ta­ge in terms of ener­gy ob­viou­sly! Se­ve­ral so­lu­tions to be­st ex­ploit this spe­cial si­tua­tion ha­ve been de­ve­lo­ped over ti­me but wi­th lit­tle suc­cess and ha­ve scar­ce­ly been de­ployed even in SES or Sur­fa­ce Ef­fect Ships and in ground ef­fect ve­hi­cles, that are es­sen­tial­ly ra­re ma­ri­ne craft whi­ch ma­ny pro­ba­bly ha­ve ne­ver even heard of. Sur­fa­ce ef­fect ships are in fact half way bet­ween ca­ta­ma­rans and ho­ver­craft sin­ce they re­sem­ble ca­ta­ma­rans but they’re par­tial­ly “lif­ted” by an air cu­shion ge­ne­ra­ted via blo­wers en­trap­ped bet­ween their two la­te­ral hulls and by “skirts” in­stal­led in the bow and stern ends. Ground ef­fect ves­sels are clo­ser to air­craft than they are to boa­ts sin­ce they fly ju­st few me­tres abo­ve wa­ter skim­ming the sur­fa­ce on an air pad whi­ch is in­stal­led un­der ea­ch wing the­re­by ex­ploi­ting what in­si­ders call WIG or Wing In Ground ef­fect. Ob­viou­sly ground ef­fect wings pro­du­ce

the sa­me lift as the wings of eve­ry air­craft does but wi­th ad­ded ground ef­fect. The idea of uni­fy­ing the prin­ci­ples of bo­th the­se ves­sels was co­n­ju­red up sco­res of years ago to ob­tain a sin­gle wa­ter­craft ca­pa­ble of re­mai­ning upright on the wa­ter. It had been en­vi­sa­ged by se­ve­ral en­gi­neer de­si­gners. One su­ch great per­son was Son­ny Le­vi who pas­sed away back in the se­ven­ties af­ter ha­ving re­vo­lu­tio­ni­sed the con­cept of pla­ning hulls and the off­sho­re ra­cing world by in­tro­du­cing ef­fi­cient fai­ring fea­tu­ring con­si­stent lift ef­fect in­stal­led abo­ve the wa­ter­li­ne along the top­si­des of his ve­ry fa­st award win­ning ra­cing hulls. Ae­ro­dy­na­mic lift was the mo­st im­por­tant ele­ment in his mo­st re­vo­lu­tio­na­ry boat, “Ar­ci­dia­vo­lo” whi­ch fea­tu­red twin ca­ta­ma­ran hulls in the bow whi­ch aft be­ca­me a sin­gle hull in the stern end. The­se ra­cing hulls’ lea­ding pro­blem was and is still “ta­ke Abo­ve on the left,the SES, Sur­fa­ce Ef­fect Ship, is a ca­ta­ma­ran whi­ch par­tial­ly lif­ts from the wa­ter thanks to an air bub­ble crea­ted by spe­cial­ly de­si­gned blo­wers. The air bub­ble is en­trap­ped bet­ween the two la­te­ral hulls and by two skirts si­tua­ted at the bow end and stern. In the two pic­tu­res , Umoe Ven­tus a 27 me­tre SES whi­ch ex­ceeds 30 kno­ts and built to car­ry crews from and two off­sho­re oil rigs. The pic­tu­re wi­th the blo­wers in ac­tion clear­ly sho­ws how the SES lif­ts in re­la­tion­ship to the pic­tu­re in whi­ch it is not mo­ving. Abo­ve on the right, Ground ef­fect air­craft ex­ploit WIG (Wing in Ground ef­fect). KM1 sho­wn in the pic­tu­re is the lar­ge­st ever built. It is 100 me­tres long wi­th a beam of 40. It used to fly at 500 kph. It was built in the USSR du­ring the cold war years. The Ame­ri­cans cal­led it the Ca­spian sea’s ma­ri­ne mon­ster.

Ar­ci­dia­vo­lo was the fir­st ves­sel fea­tu­ring ae­ro­dy­na­mic ad­van­ce­ment whi­ch was bo­th well ba­lan­ced and ade­qua­te­ly con­trol­led. It can be re­co­gni­sed ea­si­ly due to its ve­ry spe­cial th­ree point hull, or up­tur­ned tri­cy­cle hull as de­si­gner “Son­ny” Le­vi li­ked to de­scri­be it.

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