Superyacht - - Design -

A2V de­ve­lo­ped Ad­van­ced Ae­ro­dy­na­mic Ves­sels’ tech­no­lo­gy. As al­rea­dy men­tio­ned it de­ri­ves from the work of pa­st pro­ject de­si­gners. So we asked co foun­der Gian­lu­ca Guel­fi how he and his part­ners de­fi­ned A2V tech­no­lo­gy and mo­st of all whe­re did they star­ted from. How did you co­me across the idea of ex­ploi­ting ae­ro­dy­na­mic lift on a boat? Well it has been around for so­me ti­me on com­pe­ti­tion mo­dels. For exam­ple off­sho­re ca­ta­ma­rans de­ve­lop a lot of it bet­ween their two hulls, in mu­ch the sa­me way as th­ree point hy­dro­pla­nes.the fea­tu­res they ha­ve in com­mon ha­ve to do wi­th the po­si­tio­ning of the cen­tre of the lift area ge­ne­ra­ted whi­ch is si­tua­ted well for­ward of the ves­sel’s geo­me­tric cen­tre. Con­se­quen­tly the­re’s a con­cre­te ri­sk the ves­sel will cap­si­ze at hi­gh speed. We car­ried out in dep­th de­tai­led stu­dies as to how this tech­no­lo­gy works, and wro­te up con­si­de­ra­ble da­ta to pa­tent whi­ch would ena­ble us to ex­ploit ae­ro­dy­na­mics sa­fe­ly (cap­si­zing ma­de im­pos­si­ble) and to op­ti­mi­ze the de­gree of lift at the lo­we­st pos­si­ble speeds by de­ploy­ing ve­ry ef­fi­cient cur­ved sur­fa­ces. Off­sho­re ra­cers, in­stead tra­vel at ve­ry hi­gh speeds in re­la­tion­ship to their di­spla­ce­ment whi­le lac­king ef­fi­cient sha­pes in ae­ro­nau­ti­cal terms sin­ce gi­ven their speed they ha­ve lit­tle need for hi­gh lift coef­fi­cien­ts. Thus we use ae­ro­dy­na­mics to in­crea­se ove­rall ef­fi­cien­cy mu­ch li­ke a foi­ler does. In re­tro­spect a foi­ler is mo­re com­plex and in the pos­si­bi­li­ty of going beyond 45 kno­ts ( foils can mess up over this speed and loo­se ef­fi­cien­cy).the­re are other pro­blems as well, re­la­ted to the trans­fer of po­wer from the hull to foils in wa­ter and mo­re. So­me­ti­me la­ter we di­sco­ve­red that Re­na­to Le­vi but “Son­ny” to hid friends was one of the mo­st pro­mi­nent pro­ject de­si­gners in his ti­me and he had al­rea­dy un­der­stood and tried to ap­ply the sa­me ideas all his wor­king li­fe. In ac­tual fact “Son­ny” Le­vi had al­rea­dy dra­wn up “Ar­ci­dia­vo­lo” an off­sho­re ra­cer back in the se­ven­ties whi­ch is still con­si­de­red re­vo­lu­tio­na­ry. Fol­lo­wing up on this in­tui­tion of his, to­wards the end of his ca­reer “Son­ny” Le­vi had de­ve­lo­ped the con­cept of ae­ro­dy­na­mic lift fur­ther and ima­gi­ned a su­per 100 me­tre boat ca­pa­ble of 100 kno­ts. The pro­ject na­me for this was “Le­vi Ram Wing”. His idea of the boat of the fu­tu­re.this pro­ject of his con­tai­ned the ad­van­ta­ges he had di­sco­ve­red whi­le ex­pe­ri­men­ting on com­pe­ti­tion mo­dels and trans­port ves­sels too and ca­me to the sa­me con­clu­sions we found by our­sel­ves th­rou­gh a mo­re scien­ti­fic ap­proa­ch. We used equi­p­ment that did not exi­st at his ti­me. We car­ried out mu­ch CFD work (com­pu­te­ri­zed fluid dy­na­mics) for bo­th ae­ro­dy­na­mic stu­dies and hy­dro­dy­na­mic ones as well.this led to crea­te ma­the­ma­ti­cal mo­dels whi­ch could del­ve dee­per in­to de­tails and pro­vi­de the da­ta we nee­ded to de­ve­lop A2VS that clear­ly pos­sess ad­van­ced ae­ro­dy­na­mic and hy­dro­dy­na­mic ef­fi­cien­cy when com­pa­red to “Son­ny” Le­vi’s pro­jec­ts. Trials and tests at sea on our 10 me­tre pro­to­ty­pe con­fir­med all of this as of 2015. Ha­ving ma­te­ria­li­sed what used to be “Son­ny” Le­vi’s in­tui­tion mu­st su­re­ly be a great fee­ling. In­deed, his ideas we­re adop­ted and de­ve­lo­ped by a col­lea­gue and friend of his, this was Fran­co Har­rauer. Bo­th had great in­tui­tions and sen­si­bi­li­ty and they li­te­ral­ly re­vo­lu­tio­ni­sed pla­ning boa­ts’ na­val ar­chi­tec­tu­re. tho­se we­re the years in whi­ch off­sho­re even­ts played a ma­jor ro­le in in­spi­ring the de­ve­lo­p­ment of re­crea­tio­nal boa­ting across Eu­ro­pe. When rea­ding from so­me of their tex­ts we can per­cei­ve that mu­ch of that “hands on” prac­ti­cal ex­pe­rien­ce is being lo­st to­day. Bo­th of them are no lon­ger wi­th us to­day but I ma­na­ged to con­tact Fran­co Har­rauer two years ago to show him so­me pic­tu­res of our pro­to­ty­pe to whi­ch we had ap­plied the ideas they had co­me up wi­th mo­re than 40 years be­fo­re. This on­going pro­ject is and has been a won­der­ful ad­ven­tu­re in terms of na­val ar­chi­tec­tu­re. But when we di­sco­ve­red that all of it had been in­tui­ted, ima­gi­ned and stu­died to so­me de­gree by the two grea­te­st pro­ject de­si­gners of their ti­me, well this ga­ve us grea­ter mo­ti­va­tion and de­ter­mi­na­tion and ma­de us feel li­ke “a bun­ch of dwarfs per­ched on the shoul­ders of two gian­ts”. And What now? Well we’re al­rea­dy in­to our third ves­sel af­ter ha­ving am­ply de­mon­stra­ted that the tech­no­lo­gy has been fi­ne tu­ned and we’re cur­ren­tly de­ve­lo­ping mo­re pro­jec­ts of fa­st ves­sels wi­th whi­ch to car­ry pas­sen­gers/ tech­ni­cians. we’ re al­so ne­go­tia­ting wi­th im­por­tant shi­pyards the pos­si­bi­li­ties of buil­ding new ge­ne­ra­tion com­mer­cial and re­lia­ble ves­sels wi­th a speed ran­ge of 40 to 60 kno­ts flan­ked by un­heard of ama­zin­gly low fuel con­sump­tion.

Left - Le­vi Ram Wing: The 100 me­tre ca­pa­ble of 100 kno­ts ima­gi­ned by “Son­ny” Le­vi by de­ve­lo­ping a tri­cy­cle up­tur­ned hull whi­ch was fir­st used for “Ar­ci­dia­vo­lo”. Right - Fran­co Har­rauer al­so con­tri­bu­ted se­ve­ral pro­jec­ts for fa­st ves­sels wi­th tri­cy­cle up­tur­ned hull. View of a 43 me­tre ca­pa­ble of 100 kno­ts.

Gian­lu­ca Guel­fi, co­foun­der of A2V (Co­py­right F. Boya­d­jian)

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