Some model experiments and ship correlation in respect to manoeuvrability

(1)

SOMF. MODEI EXP IN:;1's _{iD ..SHIPCORELAION IÌ}

RESPECT To

NAN

_R4BLIPI

:b 1oichi. Kawano,

eber

Yoshio Murata, meer

-,

hiko (atsoka, member** abro Yasui,. 'rnember

Abstract

The Dresent aer relatés tosorne mqdel exDerjrts and ship

correlation in resDect to _{rnanoeuvrabílity, carried out at the}

Osaka

University Thnk under co-operatjQn of _{Cava alci} _{ockyrd Co'. ana Sasebo}

T-reav Industries Co.

The standard zig-zag tests veré carried out

for a 13, OOOY1 car'o 1iner and- _{herodel at various load cnditjons}

while the similar tests as well as

_iin

_soir _tests _{ere dore}

fora 13O,OOÖ Di _{s-uper tanker and her model at full load condition.}

The correlative studies shöws _{that model ships aré much}

more stable _{n course, mucb ouicker ii response to helm and have less} turnin _{ability for slight hel} _compared

_with

actia1 ships. _Thè

difference between models and _{aìios, however, decrease with}

ncreae

of the. intensity of turninsr motion _{o that there i& no significant}

discrepânoy htween th- two iii respecb to turning diameter _or

hard-over hè,m.. _{In a word, there -} _{a c6nsiderable model-ahi}

disagreement

upo-n.stabi1itpon coarqe, but

_nOt

_{upon turning perfortha.nce at bard-.}

over. It shou),d seem that this _{discreancy ±elates largely to} difference _{n proreller race intensity through rudder effectiveress}

an _{possibly propeller fin effect.}

The differencé results largely

from the lack of friction _{correction for free-running moaeJ,s}

Post Graduate Student of the _{Osaka University}

Chief of Designing

_{Section, Sasebo Heavy Industries}

Co..

Principal 2nSinee of Development Section _{Kawaakj. Dàckyard Co.}

++ The full Daper will b _{presented at the Spring}

_{Neetingf the}

Socìe'ty oNavai _{Architects and Marine .ngineers}

_{of Japn, ben}

written in1Ja.pane.

14

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F#.

ItiFECT(JV

1JDDR ARil\ RATiO" means rudctor

area ra 110 with some correction for difference

in proìeLler racè intensity beweer]

an actual ship and her model, and it'

necessary, with

'cor'ect&on for-asbect rat.iosof'ruddère.

}'ropeller-rudde' system open test

data

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The propeller iace of

free-runnihg riiödel is nuch more

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intense pompared with corresponding act&. sh by reanon nf its larger frictional resisance coef fi-. ciept, so that effective rudder 'irea ratioof a model js ]arer than the one' of