Hydrofoils Ppt Na456

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HYDROFOILS

BY

  A.ADHIMOOLAM(NA456)

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DEFNITION

. A winglike struture !tt!"e# t$ t"e "ull $% !

&$!t t"!t r!ises !ll $r '!rt $% t"e "ull $ut $% t"ew!ter w"en t"e &$!t is $ing %$rw!r#* t"us

re#uing #r!g.

. A &$!t e+ui''e# wit" ",#r$%$ils. Als$!lle# hydroplane

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HITO/Y OF HYD/OFOIL

It!li!n inent$r Enrico Forlanini &eg!n

w$rking $n ",#r$%$ils in 0121* !n# use#

  ! 3l!##er %$ils s,ste.

In 022 $'!n, &uilt t"e %ull s!le

7%$$t (6.8 ) l$ng &$!t* Miranda III.

  Drien &, ! 6 "' (45 k9) engine* it

r$#e $n ! &$w%$il !n# :!t stern. T"e

su&se+uent Miranda IV  w!s re#ite#wit" ! s'ee# $% ;5 kn$ts (65 k<").=6>

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DE?ELO@MENT OF HYD/OFOIL

. On 2 e'te&er 0202 t"e HD74 #eel$'e#

&, Bell !n# B!l#win set ! w$rl# !rine s'ee#

  re$r# $% 004 k<" (8.16 '")* ! re$r#

  w"i" st$$# %$r tw$ #e!#es.

. In 025* u'r!!r l!un"e# t"e rst$eri!l

  ",#r$%$il* @T0 Frei! #COr$ ($l#enArr$w)*

in L!ke M!ggi$re* &etween witerl!n# !n#It!l,.

  T"e @T0 is $% sur%!e7'iering t,'e* it !n!rr, ; '!ssengers !n# tr!el !t ;5 kn$ts(65 k<").

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 TY@E OF HYD/OFOIL

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9O/IN @/INGI@LE

At l$w s'ee#s t"e "ull (&$#, $% s"i') sits in t"e w!ter !n# t"e",#r$%$ils !re t$t!ll, su&erge# in t"e w!ter.

As t"e &$!ts s'ee# inre!ses* t"e ",#r$%$ils re!te li%t.

At ! ert!in s'ee#* t"e li%t 'r$#ue# &, t"e ",#r$%$ils e+u!l

t"e su $% t"e &$!t !n# !rg$ weig"ts. T"ere%$re t"e "ull$es $ut $% t"e w!ter.

  Inste!# $% "!ing !n inre!se in #r!g wit" inre!sings'ee# &e!use t"e "ull is li%te# $ut $% t"e w!ter ($ntr!r,

t$ w"!t "!''ens in tr!#iti$n!l &$!ts #ue t$ 'ressure #r!g)* t"e",#r$%$ils 'r$i#e ! $re eient w!, $% ruising. Dere!singt"e #r!g $ntri&utes t$ t"e &etter use $% t"e '$wer nee#e# %$rt"e $eent $% t"e &$!t.

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LIFTIN MEGHANIM

As t"e s'ee# !l$ng t"ese stre!linesinre!ses*t"e 'ressure #r$'s (t"is will &e$ei'$rt!nt s"$rtl,). T"e :ui# t"!t $es $er t"e

u''er sur%!e $% t"e %$il $es %!ster t"!nt"e :ui# $n t"e &$tt$

 T"e #iJerene &etween t"e 'ressure $n t"e t$'sur%!e !n# t"e !&ient 'ressure !t t"e &$tt$

sur%!e will 'r$#ue ! net 'ressure t"!t will !uset"e li%t.(ee #i!gr!.)

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KE OF HYD/OFOIL

 T"ese ",#r$%$il &$!ts !re $stl, use#%$r s"ing &ut gien t"e s'ee# %!t$r*t"ese ",#r$%$il &$!ts !n &e use# %$r !ultitu#e $% 'ur'$ses in t"e #!,s t$$e.

0. T"e "ig" s'ee#* s$$t" ruise !n#&etter turns #eliere# &, ",#r$%$ils"!e &een use# in ilit!r, s"i's.

$iet Kni$n &uilt ?$sk"$#s !re $ne $%

t"e $st suess%ul '!ssenger ",#r$%$il#esigns. It w!s #eel$'e# in t"e $ietKni$n !n# !nu%!ture# in /ussi! !n#Kkr!ine.

H,#r$%$ils !re use# in w!ter s'$rts in!n, $untries

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DEME/IT OF HYD/OFOIL

H,#r$%$ils !re sensitie t$ i'!ts wit":$!ting $&ets !n# !rine !ni!ls. I% t"e",#r$%$ils "it s$et"ing t"e &$!t will %!ll$J t"e %$ils !n# t"is $%ten re!tes !'ere'ti$n $% inre!se# #!nger

H,#r$%$ils !re e'ensie t$ &uil#. A essellike t"e B$eing et%$il n$w!#!,s $sts!&$ut ; ties t"e 'rie $% !n e+ui!lent!t!!r!n '!ssenger %err,. T"is 'riest"e $ut $% t"e !rket $'letel,

 T"e se$n# 'r$&le is ",#r$%$ils !re!l$st like s"!r' knies g$ing t"r$ug" t"ew!ter* n$r!ll, %!t!ll, inuring !n, !rine!!l (e.g. w"!les) t"e, "it. T"is is in$ntr!st t$ n$r!l "ulls w"i" ust sli#e

$er ! w"!le wit" ini!l #!!ge t$&$t".

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GONGLKION

 ust like ,!"ts w"i" "!e re$luti$nie# t"es"i''ing !n# t"e &$!ting in#ustr, t$ ! gre!t leel*t"e ",#r$%$il &$!ts !re !ls$ !'!&le $% #$ings$et"ing e+u!ll, gre!t. /ig"t n$w t"e us!ge $% !

",#r$%$il &$!t is n$t u" &ut gien t"e &enets!n# t"e eien, $% su" &$!ts* it is +uite '$ssi&let"!t $re !n# $re '!rties will t!ke t$ &$!tsin$ling t"e use $% ",#r$%$il !s ! suess%ul!ltern!tie t$ t"e eisting $nes.

 T"ese ",#r$%$il &$!ts !re $'!t !n# unlikeseer!l $t"er ites w"i" "!e l$ts $% restriti$nsi'$se# $n t"e &e!use $% t"eir $'!tness*t"e, !re %ree $% !n, enu&r!nes* !king t"e

een lur!tie %r$ t"e '$int $% iew $% !n, urrent!n# '$tenti!l &$!t7$wner