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MODEL 4667
MODEL SCALE IN INCHES
ENLARGED SPRay_sTRIP
Sa CMe Loet ta te toe ae anes Nhe
oO! 23456789 nue
abt tatty
nite
(0) Float Parent 1)
Fig. 1 Body plass of tentative and final parent models
Resistonce Tests of a Systematic Series of Planing Hull Forms tn percent
Fig. 2 Form characteristics cutves for parent model
Table 1
yctiulars “4085 008,
Ant fay eins
ho 5887
15h 38a.
19551886
Bett Ym 1 380
Telos 238300
Ly/Bax 2.09 3.00
Box) Bre vis iat
Boal Bee os on
Cipteoid de,
Te fed of
‘ansorn a8 82
nagle ofa cine
ft plan vein dex 5.0 50
alt ange af
sraterine
Steanee, deg 0
pressed by the dimensionless ratio 49/0", where
Ap is the projected planing bottom area and V is
thevolume of water displaced at rest. As pointed
out in (3), if hulls with different Jengthi-beam
ratios are compared on the basis of equal ly/ 0",
then the comparison will be on the sound basis of
very nearly equal values of hull area, hull volume,
and hull structural weight. Longitudinal CG
location i dafined as the distance of the LCG
from the centroid of the area Ap, expeessed as a
percentage of the length Ln.
‘The present series was planned so as to explore
ina systematic way the effects of a wide variation
in the three variables just mentioned, This ean
be done relatively economically wher compared
with the method used for systematic investiga
tions af displacement-hall forms. ‘This is possible
494
Particulars of the Models of DTMB Series No. 62
Mote! -
Aart 08
1200 518
3.000 S000
Tem 1199
1038 1435,
1290 oa
500 oe
oo oa)
1 ie
et O88
ass 438 ass
50 at 29
6 39 Eo
because it is feasible to explore the effects of
variation of loading and LCG location with a
model. ‘Thus, different mnodels are required
only for exploration of the effect of length-beam
ratio
Five models, Models 4065, 4666, 4667-1, 4668,
and 4669, were tested to explore the influence ot
fength-beam ratio. They are shown in plan view
in Fig. 3. Additional particulars of the models are
given in Table J. AS can be seen, the values of
‘Jength-beam ratio tested in the series correspond
to Values of Zp/Brx of 2, 5.06, 4.09, 5.5 and 7.
‘The extreme models are outside the generally
accepted range of boat proportions, but one of the
purposes of systematicseries work is to explore
fnew and unfamiliar ground, The body plans for
the five models are identical except for some slight,
Resistonce Tests of a Systematic Series of Planing Hull Forms
Ship Resistance and Propulsion Prof. Dr. P. Krishnankutty Ocean Department Indian Institute of Technology, Madras Lecture - 15 Resistance of Advanced Marine Vehicles - I
Ship Resistance and Propulsion Prof. Dr. P. Krishnankutty Ocean Department Indian Institute of Technology, Madras Lecture - 15 Resistance of Advanced Marine Vehicles - I
