BREAKCR
ROLLINS UP-ASTERN
COURSE KEPINC
BROACHING?
O 5EC 35 KM a P0Q FEDsriER1N
i
OOACHINC
TL1iiJ
OVRTANIN
CONT. VSL IIO1
---SEC.-
r-bUSDE
1aboraorium 'icor
Schee3hydrornechj
iftrchf
Mekelweg 2, 2623 CD D&ft
L 1- ¡bC8j- Ed*j O1-7L83
sj;
M s\N'OUT VAN
GEUN5
C1VL ENc1NEE
SEA/CO5T PORT5
IZAAC EREEN
CHLEF COXWA(PJ OF COASTEL
UFESOAT/KNRM
ERNsT VQS5NAC
NAVAL ARCH LTEC1. -EDLLOYD
2
14- DCT-7
2
UNDER5TANT1r'4C THE SEA AND.EACHOTHE.R
IN T11t5 (APER
Ti-fE AUTHOP3 AR.TRY(Nc TO CLOSE THcAP
ETWEEt4 CVER 1ATHE.MATC(AN3 OF uNlvi5TI E
ON ON
5LDE.
AND T-4
PRAC-TLCAL
SEAnENON THE OFOSITE5)DE
THE WIND\A/AyE '
is THa BASE
-\c/OuT VAN
EUN-S DQAW
uP A PCTuRE OFTi-iE RUNNtNC\r/AVEy
WFiIC.*f CORESFONDS 'JíH
vf-tE \AL.WAVE
«
- £3AS.
tTt-4E "ELLIPICAL-_TCC±-IO'ÇDE,WI-{iCN
rJes us
THE ROTPTNc r1LOTIOMS CF
f-(HOR1QMTL/VERTKL
ACCELE RATtONS OF wAvc3uoys TO
BE M5ucED 1-1OR(ZOÇTALVERT(C.
THE TROCHOWAL
AV
STILL
XJ5T5
(-r
St-JOS-WAVE DOEs t'o
HAVE
t-ioRzo NTF¼L rlovErler'iiS)
-
CW<.WIN5 OF LFE3OAT5
A LaT Ö
XFtEN4Ci
AÇREE vJT1
T-E ?tUR
WHcCH AE IN ThS ?APE-.
- SortE TInES
THE' 1-tAVE. \/E.R'( USEFUL RE.r1AcKswt-jERE At'D HOW
TOAUVRE IM A SWELL WITH
REKERS
!
-TNKS1OTHM AiWILLEM \/PtRKEVIS5ER QF THE MAIITi
REScEJRC-° CENi1E
- TECHN. u
VEçSÇTy.jDLFTl)c NEKELw
2262aCD DEI_FI
I1 O LLANO
P..E4CTIONS REGJPDIN(' Ti-US PAPE1
TO3E SENT TQ
,FOUMDTOÑ OF NETNERLNDS CAPE -
HORE.R5
CH1IS OFFRNGA ,
WETI-%QLJDEP-
IERNAN-STRAAT
7
PRESIDN
t/- 74 <ZG OO5THU)ZEN
THE NETHIRLANDS
i
.34
IRREGULAR SEA
HOR1LONTL ACC-L1ATONS
OU(-D
E
MEASURED
5uLTANtE.G5Y
PRlOD
L155ECPEt.
60 sEc
ii..00...t{Oi OALIN1;Ni
2
r>
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¡7
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t'
WIND BLOWING OVER THE CORN FJLD
Io
S
YNOÑ-YJiOCJ5
-ro THE
WEND WAVE"
VELDCÍry OF WAVCRE5T
WAVE3
OVE P c%RQ(JND PcEO13j-
KNOTSuvrt
1A4»
\.Ç/ATPA(-TICLE5-S
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Tt1S SPCEVR-ROU
RBF AND VELOCJT"/
Vouî
VAT4UNs
Gs-
12. s:
j
S(C34
I ¡'f
SEC
10
No reflectioft pure progressive waves
19L Particle
trajectories
in piane
periodic water
waves. Two wave trains of the same frequency traveling in
opposite directions are produced by a progressive wave
coming from the left that is reflected by a partially
absorb-ent bamer. The top photograph shows the pure
progres-sive wave with no reflection. its amplinde is four per cent
of the wavelength, and the water deoth
per cent.
White particles suspended in the water are photographed
during one period. Their tra jecrones are practically ellipses
traversed clockwise, circular at the free surface and
fiar-24% reflection
u1.c4TLY wANTeD Qr
TUR3UL
tened thward the bottom. Some open loops jod icr,
drift to the right near the surface and left near ßOTIC
As the reflection is increased, the orbits becr
ingiv flattened and inclined. Complete refleccoN O
pure standing wave in the last photograph.
trajectories are streamlines. T'nere the upper
envelopes of the water surface show th-ie
tion does not vanish at the nodes. Wailer
courtes' of M. C. Vasseur
(
38% reflection
Fcaee. SuiZF\C-..,
CLOCI WI
eoTro
Q, Q,
0
Q3 b, Q, Q, N o0
o, o t: o LUt
u)lo - L S
Stichting Nedcrlantlsc Ktap t ¡í,orn-vaarders
M. ttinrnt,s,tt i
I
74 I(C O.h.itn TUD O
ALTeRATION OF
COURS
tAt'4ER
oit:
QACH INC
>
TIJD 7 3econden1411
WAVE HEICH
lIJO '11+ jgcoitd9ri £agt.-WAVE SPED 4O}
= Z.
POtNTS.
'tonm wicI
5HIP5PD. LOKs.
De
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tua
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[iì 1Ì1UUI VOEu AJGZ 20'fl
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de ioianqet.
20ioo as de iran ie
ciíp
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uuuidooi?opnd
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ao1 i £oop
oïide
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tj ucìtei?.j?e wind om
ieMp
eîe
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uft de zoet.
k ,ioo
iraa
roo dwai
'ia?Jen tn eLodat.
ondcwindackt «
t lO
ZflOOp,cjof infIitd
t Jo
r.00p.PAS 3AT' WOUT VM-1 CtJ
o
I3C
£t'ER. FO1. HELr1S\Ar Ot
tutu: I Iii()(It-V1,1[IICIS i ri liiIi\ titi 7 I ¶ iLt i 3 -q c.. -4 C. o 4v Ro :,v t f t Ci o)'
ni.
1-Lz'1
L7t-)I1l
f')vIni
t2Q.
zt,.LONDON
RUPERT HART-DAVIS
¡95'
The narrative cf a voyage
round the world in a Windjammer
by
REX CLEMENTS
With a Foreword by
BASIL LUBBOCK
ROUNDING THE HORN
-. -- Thi-i$
no gaflev tire, 'and tie
eward rcine pcoi
Only our bczt zte-mc were allowedat the wheel. Another
undcr the poop. He rnagd to boil somc
man wa stationed co 1ctwu-d to bear a hand with the zcok.
M' oil-stove and we had a drink of rc
apicce atThe, old mn never moved far away fr the hd The re- with a ca-biscuiz and a handM of bully-beef.
mainder ofus were gathered ori the fore part ofthe poop. There So the day wore on. Dreithed to the zkin ad zrained al-was nothing wc could do while the gr held. Thc main deck brkg point through tandiiig up against that living was a seething whirlpool, swept by end1 tons ofgreen water, afl ofwind, I thought the end of the world h.d comeand that made a daski for'ard a maxzcroflife and death. come it nearly did for us.
It was just after four bells in the afternoon watch, following
a
shrieking squall that exceeded all that had gone before, and
while the barque was still wallowing like
a half-tide rock, that
we saw a monstrous, foam-crested breaker rolling up astern.
We h 5CCfl many bclore; tn Wa out a giant among giants.
gladiaor, ore-tricki and fainung c.rds of the ciamour
coming on with unopposabie stride. It wa the behaviour f axound and the upiiftedsword ofan tuLtant foc. Buried deer
tk
hard1y-prscd baruc that troubled i. Shelay likea
under a weight ofwater, there wa. no lIfe in her.ana. ifigher tue comber
rose, with a toppling,
con-cave crest, swiftly overtaking thTeship.
We doubted the staggering hull would ever rise to it and alU" We sprang for stanchion and backsay ini clung
demer-there was little need for the old man's hoarse shout: "Hang on ately to them. The towering gre''-beard swept down on the sisip. came up with her, asid was met by no assswerinz rise.
-
High abov the taifrail-forty
or fifty feetloomed, and
the
next moment it fell,
and I knew the blemed feel of light and freedom asin. Itcannot have lasted for snore than the space of a few seconds, The íh1 of the tirmasncnt frcsi above ou1dnot. 1ave bcc
but it suificed me to learn the meaning of that word that in more tcrnble. Six feet above the poop deck we were buried eternity a thousand years are but as a moment.
under a black wight of water. For the space of a Sew seconds The bosun and I had jumped for the port tnizzen rigging and
we knew not if the barasse still floated or was being forced down had been clinging io the topmast bacicatav. As the water pa.ed
to the depths intorably. Through instinct snore than caercise we looked up. The great roller that had pooped us swept of will I hung on, with the strangle-hold of a rsighunare upon for'ard and buried the ship deep under a green swirl of water. me and the deadly thunder nf water in my ears. Even s.c we looked, two walls of water rushed in over the
sub-I felt my shoulders were being wrenched out as demoxi- merged bulwarks and collided down the length of the ship. The
angers plucked at me; then the weight of the avalanche lifted, - hull settled and felt dead beneath our feet.
"Jy God, she's gond" said
the bosun.
I glanced at th
fore t'gallant yard, motionless against the
sky. It
was the last thing I ever expected to see. Nothing of the
ship was visible, save the deck of the fo'c'sle head, like a lonely
rock. Another bucket of
water would have done for us.
Fon a few seconds we lay, sa it were, strsccn anti a-swoon. the roller swung down on us, her stern rose slowly to it, and it Another whitelipped monster was rollingup astern, but before surged on and under, lifting the baroue on its shoulder,,
spout-t reached us spout-the gallanspout-t old barque seemed spout-to make a mighspout-ty ing cataracts from every pot-t.
etTort. She quivered and laboured heavily up, throwing the The worst was over; we had corne through that and were water from her main deck and lifting her soeanssng bows. As ready to face fresh onslaughtz with conuidcncc.
5
A GIPSY
THE MARINERS LIBRARY
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FIGURE 4. Monohull Capsize
20
FIGURE 5. Multihull Capsize
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CAPSIZED:
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cR.W AZSO LOS1
I32
INTER'JATLONAL LIFE-BOAT
CONFERENCE.
324
'IN5UL1NDE"DESNED
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C5ER 12
HPRP 5KC
ToREyE('{T
a -J '4TR'YIr4C
r0 triPRovE PLAN IÑC AND
COURSE KfENG
I2.UMI
3ucirs
ARE A
MUST
part o the HM Series
terj
' fiinctjons.
A balanced steering
deflector deflects the
jetstream to port or
starboard In responseto helm commands.
This deflector is
designed to maximise
lateral thrust with
minimum loss of
forward thrust
nolbeoiq O1I9nJ
loi hidanota flOOlfl
.d.bom lli
PROPOSED ,6.D7 .ÑE*/
AS 8Lr
LENCTEt O.A..,
H5.20n
LENGTH HULL
14.60m
LEÑGTH. W.L.
1T80
BEAM ,Ö.A.
5.39
BEAM HULL
4.20 m
DRAFT
0.90.m
-EsT
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CEN1RE 3APD
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section sectIon frame 10 trame 4 Section trame 6
"VOYAGJ"
PILOT-1iOLLAND1 537
8RITStt V.5I'H
UPE BOAT PRO.c.T
DUTCH DSiaN
:ioo
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R ES Cu E -8
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T 9196
LI FE(30 AT KNR M 15 7
NORWAy orstr
NAZEWIt'U<EL-'TRENT 'U.K
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PART 3
WIN DWAVE
EVLOP!D 3Y
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25.
pPi-U
PPs AE
AJ. '1Ar4(EUNS
E. vos5N'C rs4CR.SIÑC DUE io R'C t
iPSM-KM
RELATIVE TO 5EABOTTOV
,MVELQcry
E(TRAWi.V-INÇ PopELLER 0F REOUCT
- -
/
-DEC REAS 8ECAU&E
-i-«r 1'r
:(
13.2 I2 IO 12kleiner clic kringen zijn. Men zie Iiguur j. Deze afneming is zodanig, dat ele diameters (lcr cirkeis (we spi-eken nog steeds over golven op (hep watet) ecn alnemende ,ieeIkundige reeks vùrrnen, als dc dicptcn een toenemende reken-
kundige reeks vorrnen. 0m bet nauwkeurigcr te zeggen: als wc (le (lleNe d
floculen dan voigt de diameter der k ringen uit (IC VOlgelÌ(IC formule: ehame/er = ¡ _z,o//L = j f .i o'73'11',
waarin e bet grondital van hct zg. natuurlij ke t ifNaperiaansc iogarithmcnstelscl is.
t)
l)czc lormole Is 1111k als voigt te schrmjven
10
log (dituiieIer)
'°
log ¡1 - 2,73 d/L.
Fig.
oortsciìrijtling vail ten cnkclvoutligc g«,Iíheweging.
i)ermieum iiu,inencopiiaiiien niet tijcisiniervallen vaig telke-ne _± periode
lig. 4
Waterheweging in cci, enkelvoniligu gull, van huyen 4C?icIi. l)c
edile lijiicit .d ¡n Iijncn vin geIi;ku
wiitcrl,gwigie.
11cl Igciiigtcinicrv;illcuì van ccii halve cciiiicuil.
I )c tiunne lijriijcs iiggcii
iii ccii u.u. dc
iIiLl<crc 191 CCII 111g 1)
a
o_yy,oi:
t-j rIi;uiicii tier w;iicnleclijes ui ver.scliillentic lilt ,iclg lui
ii tuikclviuiiligt gull ill
liti) W.iiCr
I
h-untiilu_Iliivucul liti cii keimpes veiscluilicui eilt Ivi llit
lii
I/i) VIII .h gcillli ligie Ill
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