LBP 53.
07
LWL 54.14
LCB -1.42
Breadth 9.82
Depth(H) 4.71
Draft(T) 2.26
Speed(knots) 15 ahead
10.5 Astern
LWL/LPP 1.02016205012248
B/Lbp 0.18503862822687
H/Lbp 0.0887507066139062
H/T 2.08407079646018
AREA OF RUDDER
GL
C1 1
C2 1
C3 1
C4 1
L 51.9744
T 2.26
A= C1 x C2 x C3 x C4 x (1.75 x L x T) /100
2.05558752
MUNRO SMITH
AREA A=(L X T)/60
1.17462144
DEF NORSKE VERITAS
AREA A=T x L x (1+ (B/L)^2 x 25)/100
2.22291263720478
Largest Area
4.555030116
AREA OF A SINGLE RUDDER 1.11145631860239
FORCE
AREA OF RUDDER
ASPECT RATIO =
Formula ,
CR = 132 x A x v^2 x k1 x k2 x k3 (N)
Ahead
99208.55592648
Astern
35354.3217483456
K1=(aspect ratio+2)/3
0.666666666666667
K2 1.1
0.8
K3 1
Rudder Force,CR 99208.55592648
TORQUE
Aspect ratio b/c
Mean height of rudder,b 1.5*c
Area of rudder ,A b*c
c : mean breadth [m] of rudder area, 0.86
α= 0.33
α= 0.66
Af= Forward area of rudder=25% of total area
0.277864079650597
Kb=Af/A
0.25
The rudder torque QR is to be determined by the following formula:
Lever
r= c (α- Kb ) [m] 0.0688637322981906
0.352926628028227
QR = CR x r (Nm)
QR 6831.87143701119
QR 12477.4815608686
Rudder torque,QR 12477.4815608686
Rudder stock diameter
Material used Mild Steel
Kr=(235/ReH)0.75
Kr=(235/ReH)
Kr
Stock dia
Dt=4.2(Qr*Kr)^1/3
Rudder couplings
CALCULATION OF RUDDER COUPLING:
Rudder stock diameter, D 96.9034169426034
Material Facrtor, Kb 0.25
kr 0.98433395248702
No of Bolts, n 6
Mean distances of bolts, e 88.4517084713017
FORMULA: Bolt dia,db=0.62*(D3*Kb/Kr*n*e)^0.5
db
Flange thickness Tf=0.62*(D3*Kb/Kf*n*e)^0.5
Tf
The thickness of the coupling flanges clear of the bolt holes is not to be less than 0.65 · t f
The width of material outside the bolt holes is not to be less than 0.67 · d b.
The distance of the bolt axis from the edges of the flange is not to be less than 1.2 times
Pintle calculation
B1 = Cr*b/c 148812.83388972
Pintle Diameter 0.35*(b1*Kr)0.5
Bush inner diameter, db 133.955167156867
Pintle height(1.2 times Diameter)
Thickness of bush
t=0.01*(B1)^0.5
t min
Pintle Bearing wall thickness d=.25 x db
Rudder bearing clearance
RUDDER PLATING
a 0.5
RUDDER PLATE THICKNESS, t t= 1.74 x a x (Pr x k)^.5 + 2.5 11.63
DESIGN PRESSURE PR= 10 T +(CR/ 10^3 x A) 111.859968445031
14.5363715108818
Rudder web
THICKNESS OF WEB 8.14036804609382
Minimum Thickness, tmin 8 x (kr)^.5
7.93708844345137
Thickness of the web 7.93708844345137
Rudder bearing
tmin 8
B1=Cr*b/c 148812.83388972
Bearing SurfaceAb=B1/q 21258.97626996 mm2
Rudder bearing
bearing clearance =
Horizontal Rudder frame spacing
horizantal spacing of rudder frame
ah=(.2 x L/100)+.4 0.50614
Vertical rudder frame spacing Spacing of vertical frame of rudder
av=1.5 x ah 0.75921
70% of ahead speed
GL-16, Rules-I, Part-1, Chapter-1 Section 1
(96% OF LWL )
m^2
m^2
L)^2 x 25)/100
m^2
m^2
m^2
GL-16, Rules-I, Part-1, Chapter-1 Section 1
1.1114563 m^2
1.5
^2 x k1 x k2 x k3 (N)
Ahead
Astern
N (As force is greater for ahead condition)
1.5
1.29 m GL-16, Rules-I, Part-1, Chapter-1 Section 1
1.1114563 m^2
m
for ahead condition
for astern condition (general)
m^2
for ahead condition
for astern condition (general)
Ahead
Astern
N-m (As torque is greater for astern condition)
GL-16, Rules-I, Part-1, Chapter-1 Section 1
240 Mpa
ReH > 235 N/mm2
ReH ≤ 235 N/mm2
0.984334
96.903417 mm
OF RUDDER COUPLING:
GL-16, Rules-I, Part-1, Chapter-1 Section 1
mm
mm distance of stock radius + clearance
2*(D3*Kb/Kr*n*e)^0.5
12.938096 mm
12.938096 mm
to be less than 0.65 · t f
8.4097622 mm
8.6685241 mm
not to be less than 1.2 times the diameter of the bolt.
15.525715 mm
GL-16, Rules-I, Part-1, Chapter-1 Section 1
GL-16, Rules-I, Part-1, Chapter-1 Section 1
133.95517 mm
mm
160.7462 mm GL-16, Rules-I, Part-1, Chapter-1 Section 1
3.8576267 mm < 8 mm 0r, t= 8mm, whichever is maximum
8 mm t ≥ tmin
33.488792 mm GL-16, Rules-I, Part-1, Chapter-1 Section 1
(db/1000)+1
1.1339552 mm
mm GL-16, Rules-I, Part-1, Chapter-1 Section 1
KN/mm^2
mm
mm 70% of the rudder palte thicknes GL-16, Rules-I, Part-1, Chapter-1 Section 1
mm
mm
GL-16, Rules-I, Part-1, Chapter-1 Section 1
mm GL-16, Rules-I, Part-1, Chapter-1 Section 1
q=7 for steel [Table 14.3]
(db/1000)+1
1.1339552 mm
m 506.14
m 759.21
les-I, Part-1, Chapter-1 Section 14 A.5
les-I, Part-1, Chapter-1 Section 14 D1.1
les-I, Part-1, Chapter-1 Section 14 D1.2
les-I, Part-1, Chapter-1 Section 14 E.1
les-I, Part-1, Chapter-1 Section 14 F-2.1
les-I, Part-1, Chapter-1 Section 14 G.6.1
les-I, Part-1, Chapter-1 Section 13 A.1
les-I, Part-1, Chapter-1 Section 14 G.5.6
les-I, Part-1, Chapter-1 Section 14 G.5.8
les-I, Part-1, Chapter-1 Section 14 G.2.1
les-I, Part-1, Chapter-1 Section 14 G.2.5
les-I, Part-1, Chapter-1 Section 14 G.5.1
les-I, Part-1, Chapter-1 Section 14 G.5.4
