PROPELLER DESIGN
PITCH DISTRIBUTION
• Pitch max.(mm) = P/D x D
• Pitch 0.2R (mm) = Pitch Distr. 0.2 x P / 100
• Pitch = Pitch Distr./ 2π
BLADE THICKNESS
BLADE THICKNESS
r/R ar / cr br / cr
0.2 1.662 0.617 0.350 0.0526 0.0040
0.3 1.882 0.613 0.350 0.0464 0.0035
0.4 2.050 0.601 0.350 0.0402 0.0030
0.5 2.152 0.586 0.350 0.0340 0.0025
0.6 2.187 0.561 0.389 0.0278 0.0020
0.7 2.144 0.524 0.443 0.0216 0.0015
0.8 1.970 0.463 0.479 0.0154 0.0010
0.9 1.582 0.351 0.500 0.0092 0.0005
1.0 - 0.000 - 0.0030 0.0000
EXPANDED AREA
Dr = Cr - Br
Ar = (Ar/ Cr) * Cr
EXPANDED AREA
Br = (Br/ Cr) * Cr
EXPANDED AREA
Cr = (D * Ae/Ao * )/Z
Sr =( - ( * Z)) * D
Nose Design
Projected Area
Pitch
r/R H0/2π
Distr H0 (mm)
1.0 100 % 4744.21 755.4
0.9 100 % 4744.21 755.4
0.8 100 % 4744.21 755.4
0.7 100 % 4744.21 755.4
0.6 100 % 4744.21 755.4
0.5 99.20 % 4706.26 749.4
0.4 95.00 % 4507.00 717.7
0.3 88.70 % 4208.12 670.1
0.2 82.20 % 3899.74 621.0
PITCH
Tan a = Pitch / 2π r
RAKE
SHAFT MATERIAL
APPROVED MATERIAL
• Propeller, intermediate and thrust shafts together with
flange and clamp couplings are to be made of forged
steel; where appropriate, couplings may be made of cast
steel.
• In general, the tensile strength of steels used for shafting
( shaft, flange coupling, bolts/fitted bolts) shall be
between 400 N/mm2 and 800 N/mm2.
• S 45 C / ST 60 = 570 – 700 N/mm2
• SUS 304 = 515-520 N/mm2
BKI Vol.III section 4.B.1
SHAFT DIAMETER
DIMENSION/ DIAMETER
• Propeller shaft & Intermediate
shaft are distinguished by F
Where F = Installation Type
BOSS PROPELLER DESIGN
BOSS PROPELLER DESIGN
0.75 tr 0.045 Dprop = tr
0.75 tr
1.8 Ds
Da 1.05 Db
0.85-0.9 Db
Ds – 2x 0.3 Lb
1.8 – 2.4 Ds
Where x = Lb/(12-20)
PROPELLER NUT
H = (0.8 – 1) x d
Do = 2d
di = 0.8 d
d > 0.6 Ds
BOLT, NUT & SPIE
BOSS NUT
Baut pengikat tutup boss (filling cone)
Jumlah baut direncanakan (Z) = 8 buah
-Diameter minimum baut (ds):
ds =16 * (Pw * 106 / N * Z * D * Rm)1/2
dimana: Pw = DHP KW
= 2942.00 KW
N =rpm = 99.13 rpm
D =DBA = 674.1 mm
Rm =Tensile Strength (Ultimate Strength)
= 600 N/m2
maka; ds = 48.456 mm
direncanakan ds = 48 mm
- Diameter ulir (d1):
d1 = 0.8 * D0
= 38.76 mm » 40 mm
- Tebal dan Tinggi mur (h):
h = 0.8 * d1
= 32 mm » 32 mm
- Diameter luar mur (d0):
d0 = 2 * D 0
= 96.91 mm » 90 mm
SPIE
0.75-1.5 Ds
0.25-0.3 Ds
0.125 Ds
Spie Thickness (t) = 1/6 Ds
Spie Path Thickness (t1) = 0.5t
DESIGN OF KEYWAY
SIDE VIEW TRANSFORMATION
• α = Arc Tan (Pitch/2π*R)
Ex = Arc Tan (0.2 R Pitch/2 π* 0.2R)
• Rad = α * 180/ π
• YF Rake = YF Rotation – ( 0.2 R * Tan 0.2rad)
• ZFe = 0.2 R * (Sin π/2) – ( XF Rotation / 0.2 R )
• XF Rotation = X * Cos α – Yface * Sin α
• X = X% * Cr
• X% = (P * Dr + (Ar-Br))/Cr
Propeller-Hull Clearence
Propeller Terms
• KT = Thrust Coefficient
• KQ = Torque Coefficient
• J = Advance Coefficient
• ɳ = Propeller Efficiency, Behind the Ship
• Ae = Expanded Area
• Ao = Disc Area
• Ad = Developed Area
• Ap = Projected Area, Normal to the y-z plane
• Pitch = Distance & Angle
