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Lab. y.
Tech
Det
SAThDG YACHT CALCUlATION PROCEDtJBEby
Cyrus Haititin
February 19%
Technical Menioranduni No. 108
Davidson Laboratory Stevens Institute of Technology
!EBRUARY 19ES
STEVENS INSTITUTE OF TECHNOLOGY
EXPERIMENTAL TOWING TANK
HOBOKEN. NEW JERSEY
SAILING YACRI' CALCULATION PROCEDURE
compiled by
Cyrus Hamlin
( TECHMtCAL MEM(ANDUM 108örmerly Note
2 of July 191..7)
TABLE OF COENTS
Page
NOTATI0IS tEED. IN SAILING YACHT TTING
i
DATA AND CALCIJLATION SHEETS
Set-Up Sheet
b
Upright Resistance Data Sheet, Plot and Calculation
s
Kinetic Stability 8
'Heeled Test Data Sheet, Plot and Calculation 9
Plot of Upright and Heeled' Resistance 12
Balance alculation and Diaara 13
Calculations and Plots foe' Wind and Boat Speed
Standard Speed and Stability, Plot and Calculations 18
INFORMATION FOR CLIEI'Tf 20
NÒT CPLAINING DETAILS 0F.SÂJIING IA.CHT CALCULATIO&
Sai]. Area and Cerrter of Effort 36
Calculations for G ' 37
Stability Calculations ' 38
Tow Point Shift ' ' Iii
Sliding Weight Shift ' 142
Rig Shift ' 142
Unbalance Arm Calculation 143
Calculations
forWind and Boat
Speed 14hMethod of Finding Characteristics at Standard VT Method of Finding Characteristics at Standard Speed
and Stability 146
BIBLIOGRAPHY 1i7
ADDENDUM
6-Meter Boats 148
N0TATI05 USED IN SAILING-YACHT TTING (from Technical Memorandum No, 16)
A
: Displacement, in pounds, or tons of 22140 pounds,
(specify which)
R Resistance, in pounds, in water
Rt Total resistance
Rf frictional resistance
Rr Residu.al resistance
F Force, in pounds, in air
FH Heeling force, 'taken norma]. to plane of symmetry
FR Driving force, taken parallel to course
FT Resultant force
WA or A Wetted area, in square feet
SA Sail area, in square feet
MA Midsection area, below LVJL
3
HA Heeling arm. Vertical distance from center oflateral resistance. to center of effort.
S Area of projected lateral piane, in square feet
p (Rho). Mass density of water, Slugs (1.990 sea
1.937 fresh), Density: Sea 614 lb./'f t.,
Fresh 62.3 lb./ft.
Mass density 'of air, (.00238)
-' (Nu) Kinematic viscosity,
V Velocity, in knots
VA Apparent wind speed
VT True wind speed
*V(m
or s) Boat or model speed
Speed made good to windwerd
y
Velocity, in ft./sec.V(.
or8)
Model or boat speed*Nt
Small m or smalls subscribed to terms indicates model
or' ship, respectively,
.TM-108
-1-*
KH KCt
Cf CLL, 8 , L
B HL
I)9
(Theta)
°
(alpha)
ocw P(Beta)
A(Lambda)
(p + x)
y
(Gamma)(Delta)
Coefficient defined Force Coefficient defined(SA)V2'
used
for airYonly
Reeling coefficient, taken normal to plane of
synmietry
Ih'iving coefficient, taken
parallel to
courseResultant coefficient
Force
(SA)
or
A V2Notez To convért K to C (for air)
F. AV F
KAY2 CA2
Ç AV2 2 2 K A . V2px 2.85
2.38 i 2.85 i 29t.5Force
are stated
in that form.
Note:
Coefficients
definedV l.689v 2.85 V2
- .00238 (l'or air)
!rM-l08 -2-Total coefficientFrictional coefficient
of the form of ForceResidual coefficient
A
Load Water
Line of model or ship
Mad.mum beam at LWLMaximum draft
Aerodynamic or hydrornamio lift
Aerodynamic
or hydrodynamic drag Heel angleAngle of attack
Angle
of attack of mean sailAngle
of attack of hull to watErAngle
of apparent wind to ship centerlineAngle
of leeway as weilas
scale ratiomodel of apparent wmnd to course
Angle
of true wind to fhip'
s heading
Angle
Áßpect ratio
-of Marconi
sailS Length of lut!Length o! foot
of hulls
(2.x Draft)2
2 x Area of projected latera]. plane
E (Epsilon) Angle of ship' s head to resultant sail force
LATURE RaATING TO RUDDS ON SAILI YACHIS
l The rudder of á sailing, yacht ordinarily extends aft from the
rudder post, whereas the tiller ordinarily extends forward. The terms. defined below are for this usual arrangement o! rudder and
tiller, and they are used regardless of the actual7arrangement which may exist in particular cases.
Helm Angle means
the angle through which the. rudder post has been turned from its central position.Weather (Leé) Héim An
le means
that thé forward end of the tiller pointa to weather (lee)0Helm Torque refers to the torque on the rudder post to maintain
arr given helm angle..
Weather (Lee) Heim
Torque
means that théhelmsman
has to exert a force on the tiller directed to weatheres.
Weather (Lee) He].m is used by' practica]. sailors without distthc
tion between angle and torque, This term is ambiguous and 'will
be avöided in our work ,
'TM-108
-3-Client
Ship
-J- Desiier
--
iength
ìo
(jj
Vo]umRati3s Areas
/oo:
Diaplacement
j-
ir-'
f Model SCa:1.e Alt. No. â lbS. â extra â test W.A., Sq.Ft. Test ti'37.Q
3. 1 'G,L.Ò.G0 /.t,? S.A.,Sq0Ft.9g:?
C.E. Hgt. C.E.Pos. A 2/AP. C.B.Area,Sq'.ft. B.C. B].00k. Coeff.4&tU2P)31
H
'-o q..i.i.ajL.LL.
C!E. Hgt. /L.L L.Ejes ./.*.L0
Canter of Board Displacement, moAdded weIght, such aa drew, Th. Totá], test weight, lb.
Wetted area, s.ft.
-Added wetted area for nidders, etc. sq. ft.
O'
Total test wetted area', sq. ft., withut, centerboaMCenter f gravity of ship, feet below LWL
Sail area, sq.
ft0
(e page 36)
Center of Effort height, feet above LWL (see page 36)
33'0Displademjt...]ngth ratio ,5t
Wetted areaL- 'Dispiaced voluin& ou.ft.
o
4-
3ijlaced volume?t.
5 S
iTBl: area ,. LWL of'. ship, ft..'LW14' ft. 5
t9SC.E.
Rgt., Ít.,-4- LWL, ft..% C.E. Psition, ft
LWL, Area ft0 Ship tModelfr.2. '':
Center of Effot position,, feét aft df Sta. b (see p.age 36)37t I
3
7
Wetted area xf
(fo! ship, sea water; for model, f'esh water)i271ec1procal of
e above.Wetted area ofcenterboard, s.
fta
A
. with centrboard.Reoipr9ca]. of
.me
aboveShip Model Ship Model Ship Iodel Ship
L.01AO ,Ft. Length over aU, feet
L. B.P0Ft.
Length
between. per ndjclars, feet:L.LL0,Ft. Load water line, feet, j
Basin, ft. Maximum beam a1 LWL, feet
Draft, Ft. .. ; Maximntnn draft, feet
â tons il 3S' Di8plaoement, .ong. tons sea Water
TM-108
ROJECT.NO. ;z.;-3
4=
- Model tested -__-
w
wModel tes1ed
--with 1/2" sand strip with 1" sand striat speeds 11 and above over complete speed range
Q O . /Q_.3x 7.1I2/Iff,3
o.7/3,)
,'o.3155.
0.11 7, 7 1L00.3 . 7 O DateTemp. of taxk water yn. checked_____
,, checked________
rn
r
Tow Bar cheCked
UPRIT RESISTA10E DATA 8IEET
UPRIGHT TESTS
40DELN0.
_-_I
.---These columns -+ are computed the
.sar as for 1/2" sand strip. 2-a Date Temp. 7,Dp.I, Dyn. checked checked Tow Bar checked
Lbs.
sand 1/2"
X 1z;"
Sand 1" zSpeed .Rcg. hesist. i C Rdg. [ResistJ c
No0 B-2-a 1/1000 ,A B-2-a 1/1000
Spring used in dynaxnozter
DUT.
Avg. A.P. - .7a27//1l
'p2.(451
Ea 'E.+'
r-4e
+'..a
(j
-.
O C)These two co]umns are plotted as
on page 6 and the line faired through them gives the values
of C for plain hull.
1'
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Model No.2.3J
3-f
-.7-/0
WA637S.o
sq.. ft.
-5,5oo
ib.
Re6 LWL8 X X V11x,,.7
3. 4
3./u-
x ':L.:
.(sea water) at S9°F. (Std. temp.) , ;c,"'3
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. -x.7
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f
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*
: In calculating Reynolds nuer for the sai]4ng yacht L1L is multiplied by .70
r ,
because of the cut-away profile and f inenea of th hull form.
$t'w
ers,wE- V,qL-, L.s$t.PNote: For an explanation of the method used on this form,
Form 10 refér to Appendix
B.TM.2S
(pagé. 38).NODJ NO.
L.3-f
KINEUC STABILITh 1ate
C.E. fabove f.b, aZ.i
.(2) (1)
k scale (ns.,J)
-ins.2f.ffc
(3) Freeboard + lack -ins. 3. 5d
(li.)1 Dynjoivot =('3' -- i; -inst
i.o
a = ¶
-(1;
_14.
5.?c
i . i
a
s
below.L.W.L.(ÇiJç,) '-ftL/,cz
--
G=
ni
(7)
(6) x scale
Ina.0/'t.)
-in..j.5?,.(8) (3) (7) j'.
-in.5.o
(9) 0 b].aw top of
deck
-inh.
3. Su;.b= (8) - (9)
-in./,13.
.(11)
11s.Zbt.5. ,(12)Amxb/a=
(11)x(1O)/(5)/31
i i Model set up b i.0=
ni:*Ïors=10
** Standard
Sliding Wgt, Rig No.
&, noiina1
..lb0
A, acruai
ci
lb0
t(Dist.; + 10) - 1
ni(actual)
+lb).
+10)
1
(c.G. oÇVe..st Nei
5eI0,$37)
TM-1o8 -8-O 10 15° 20° 50 300 (13) 2.00 x coe2 ê 1.985 " 1.9b0 1.866 1.766 1.6h3 .5oO (lii) 2.00z
Cd
/a -
(13)/(5) o7go r iH
i (15) sin e cos 0 1/2 sn 2 0 .0869 .1710 .2500 .3211.(i6)
when S = 0, (F11coa
9)
12) z (1,
.(17),
10*
(])
:(18)
whenX= 10kFHCOS)mm
(16) + (:
(19);
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- (&
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weiit shift.383O 0J330 Li) - rc
e ,
iR-ieq
ii_Fcv.cef
fRZ&-LE1
te
9
: -Sept. 28,1937
Alt.
Jan.
2. 1938
Form 7
Model No.
Z3-e'
(See No.Q
13.IJ1) and Tole Cord Tension_______ - Date Sp.-O Note: odel ModelO?.O°
. Sliding weight /.00 g.g3o.3-i.3.
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0
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04.4 C, cd o 43 o r144430
o
a, 43 .r4 O 43 0cdc)u
It is usually
sufficient to obtain
9Etest points at each heel angle.This is done b3r testing 3 different values of speed with 3 different
values of F,,. cos 9 per speed0 These 9 points are then plotted as illustrated on page 10.
On this form the test engineer record3 heeled test results.
Stup
eight Checked Leeway Zero Checked
I"
i
E.
Jig Rollers
CheckedV'
Dynamometers Checked V}T1.D
TEST DATA SHEET TM-l08--9-(see p.li2),
Boat
3t.U0
OHE. Rig3hifti
LWL
3.
Model Wt ?. 4. Z5Ri. g Position #
o
E ck.
RudderCe.4pLBoard
Water Level1im
'CLRTota].
-Aft. Lat. F0°033° _7/.7
i3O00o.3S
Is 0. 33o I /,Ooo.3(S
il'HCO39j Sp.No.
i
E w o w o) Q wI.
Sp.No.
-9 Leeway, inches,
degrees Result. FH cos QPist, aft Sta, O
ÇLR, LWL rl . V w w 4.3
rlQ
k
wo
Ecdrl
e7 2j3
.5.3Jt
,391L /3,3v
3j,,DO 3Jf°
3S'7/ LJ)
!Paken fvom Plot 14, page 10, at resultant
FHcosQ
Line above x 2(1" in 28.6S sbtenda 2° arc
Taken from Plot 1, p.10 at intersections
Taken from Plot 3, p.lO, at resultant FHC0SQ Line above 4 LWLm in
inches x loo
Form 8 TM-108
-;i-]--,?;
1?
,3(o.oaf7a.?.V.
WS.7
azo
3'7$
eèled Comriutations
Model Test No. 2
a 3-!
and-(4)
-
LC.
R Ct ÌACF
c
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I !'11b II9!!
HYnE iii n n y r-01 r-J.(14) Ra/FN C:05 Q
.C.E.Hgt.. (ft)s
C.E.Hgt. (in)m
(7)xsin9
C.E.Aft.Sta.O(ft)s
C. E.a.ft.Sta.O(in)zn
(6) C.E.aft.T.P. (in)m
(8) Unbal.Arflis(in)m
W3.Sca1ed off dia'am, page
114Unbal, Arms (f t) s
W ..35 I 3, o7
Line above .-- model scàle
Unbal..Arms (
L.W.LO)17.2.9
W,Sc?Line
above ---LWL, ft., xlOO
*
Mote:
Numbers on left side of page refer to
steps on page
114.'53Taken
from plot
14,page 10
/.31
j.37
Towpoint offsei, taken from tble on
p. li].
/, t'
I. I (
Di1'ferexice
/3,3?
Taken from Plot 3, page 10
/ Q. ?' Line above minus 2." (the twpoint distance
from Sta,. 0)
Resultant water for ce Ön hull'
/, o7 .3
J, J? 7 Line above x
14 FHcosQscaled to lj,"
for ease in plotting
.
. ---' Center Of effort above LWL
- r Line abóve x mOdel Sca.e
Horizontal effect of C.E. due to heel
Horizontal distance af of Sta, O
'Line above x model so4e
J. ?(,
-
Line above - minus
2.S"
F'm 6
Note:
For explanation of method see page 143
.TM-108For explanation òf towpoint offset, see page 1].
13
-.Model Test No. ¿3-1
Balance Calculations.
ßp. No
- Q
aeeway(in)
(J.)'*TP
(in)
2) Leeway - T.?.
.CLR Dit.
t,T.?.
from Sta noti
H-PAODL ÑO. 23-1
Note: F explanation of method uued
see page 143.
Numbers in circles refer to line
numbers on page 13, Balance
calculationaD
ê
$Ño.= L
9
#L.D CE
P0.siTiQIJ
SCP.LE:
SLOPE oP
1E VEC.T0S
o#J MODEL
DsSTPJc E
ET%&EEpJ
FOFitID i
i DVJAMOMTES.
T4
PswEÑSIot.J
s T4E JÑ PPUJt
pR4
VT Vmg Vmg/
vs
vi ri
9
Áo
s=II.3A/(L/l0O)
S.A.=9T'TL
/.f
C.E.Hgt.Calculation for Wind and Boat Speed
S2.17 J i 11mg X 5.3.f,'
5.o
C.L.R.(
LWL)3Oo3'9C
Unbal.Arms (ft.)
Unbal.Arms (
Rèsuits at7l
).3o
t.°5 5j7:
5-7/
C»75
53'
(2.7o
5°
//4-':
3j.
1!-jWo
J
C.E.Pos. j;_o'
Heel angle Standard Values of VT Standard valuesFrom page 17 at standard VT Li ne above
from page 17 at standard VT Line above
From page 17 at standard VT
33°ip
LA.
Vo..
1.O G3j.?'cJ,,
Vol.
039j
Speed Nô. / Cl
Vs
¿)+
e1ocity:of ship, knotsR5 Ship Resistance, lb.
from
page :11(FHcOS9) Resultant from Piot 1, page 10
(FHcosQ)s Line above x displacemeit ratio
(FHcos9/ )s Line above diplacement in tons
(Rs/FHcose ) s
.;.993
Resultant water torce on hullX
9c5
From Girnack sail coefficientsX SA x 1O Line above x Sail area in s. ft.
V2A
:3gj
R3 -- line aboveVA
/7.(i
./7
j line
aboveVA/Vs
Z?
Line above.4-
V, ship
Speed( + From Gimcrack sai]. coefficients
/.5c /.?7
From contours of: solutiöns oftriangles. See note SLa (see p. Iü& also
Vmg/V5
Form 3
Note: For explanation, see page bL Th-10815
-Model Test No. 273-I
J.
From above (X V) From page 11ñom page U
From page 13 From page 13t2_
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Leeway
inches
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Result
FHC0SQfiat,
aft.
Sta.
CLR, LVIL
Diet, aft. Sta. O
$TAÌìARD VALU
s
v3/iT
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o9io. I1-7.5
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o
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LVL17[
STANDABD SPEED AND STABILITY TM-108
Heéled Computations
Mode]. Teat No. 2.
?3 - I
1/(A)m -
3
7h,, I
S.C.
-
o.'5x
9,FcosGJSp.No.
¿ç 1
(4V2
x]O
x103 e¡if
L.3s,.00a1t7
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;.Ç,.32rn'/-36
ff,06
G'1
4L477
or explanation o!
thod uei, see page 16
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1 iE:Pages 21
through 3h
are the forms onwhich the final test results are given to the client unless additional inf'mation is speci fically requested.
Copies are distributed as follows:
i to client
i to correspondence file
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Original in test f ôlder
m-108
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