LAWSON_Propulsion_Calculations.pdf

DOCUMENT # 678-C605-03 REV. ACT MARINE

NOZZLES AND THRUSTERSMINIMUM ABS PROP THICKNESS for PROPTHIK coe 1980 tripleFILEMAY 13, 2005DATE:

203-1410JOB #:

ARMY CORPS OF ENGINEERSCLIENT

REPLACEMENT TRIPLE SCREW TOWBOAT FOR "PATOKA"VESSEL:

ABS CERTIFICATION OF THRUSTERS, 1984RULES:

INPUTABS SYMBOLENGLISHUNITS:

55.500NOMINAL PITCH670.0HBHP

1.067NOMINAL P/DRPM2100RPMMAX ENGINE RPM

: 15.030GEAR RATIO

RPM417.5RRPM MAX

4.0NNUMBER OF BLADES

0.988p.35P/D AT .35R 1.126p.7 P/D AT .7R est20.623INCHES20.500WAPPROX. EXP WIDTH AT .35R.

1.000a(ie 0.7)DAR

SQ IN.2123.388BLADE AREA

FEET4.333D PROP. DIAMETER (FT)

INCHES0.000KRAKE (INCHES)

AqualoyMATERIAL 77f see SEC. 26 (<61M)

0.27w or SEC. 37 ABS STEEL

1.000SSIZE COEF.

FREEBOLLARD SEE SEC 37 IF > 20'

9.09311.74110.500SELECTACALCULATIONS

55.334B 2425.720C

INCHES1.463MINIMUM ABS THICKNESS AT .35 R. =

INCHES1.625ACTUAL THICKNESS AR .35 R. =

PERCENT11PERCENTAGE THICKNESS OVER MIN.

INCHES0.438THICKNESS AT 1.0R =

INCHES2.264PROJ. BLADE THICKNESS AT 0.0 R.

0.0435BTF

0.100CnNOTE:

0.700Cs

INCHES55.500NOMINAL PITCH

PITCH% PITCHRADIUS

50.10.9020.300 52.00.9370.400 53.70.9680.500 55.10.9930.600 56.11.0110.700 56.61.0200.800 56.11.0110.900 55.10.9920.950 53.80.9691.000

SUGGEST55.5EFFECTIVE PITCH

12.0IN13.0LENGTHAPPROXIMATE HUB

9.4IN10.0OD

HUB5.2IN5.00ID

WEIGHT

217 POUNDS751APPROXIMATE WEIGHT

# FT^2968APPROXIMATE WR^2

NOTE: HUB TO BE FITTED WITH STANDARD TAPER, KEYWAY AND BOLT HOLES FOR

WHEEL PULLER APPROPRIATE FOR THIS SIZE WHEEL.

PROPELLER DESIGN SPECIFICATION FOR THE

COE 1980 HP TRIPLE SCREW TOWBOAT

DOCUMENT # 678-C605-03 REV. A

BY

CT MARINE

May 13, 2005

DESIGN PARAMETERS

BHP 670 EACH

ENGINE RPM 2100 WITH 5.03:1 GEAR

BLADES 4

DESIGN SPEED 7.75 MPH PUSHING,

FREE SPEED 10.0 MPH PLUS

DESIGN CONDITION PUSHING CRANE BARGE PLUS UTILITY BARGES

NOZZLE STYLE CT 28, 53” INSIDE DIAMETER

TIP SPEED 94.7 FPS

LOADING 4.5 PSI

HAND TWO RIGHT, ONE LEFT (OWNER TO CONFIRM

ROTATION!)

STYLE KAPLAN WITH 6" R. IN CORNERS

PROP. DIAMETER 52” IN

RAKE 0”

SKEW 5 degrees maximum

PITCH 55.5” NOMINAL ( SEE NOTES BELOW)

DEVELOPED AREA 2123 IN^2

DAR 1.00

BTF 0.0435

BLADE THICKNESS @ .35R = 1.625” (1.463”= ABS MINIMUM )

BLADE THICKNESS @ 1.0R = 0.4375”

APPROX WEIGHT = 751 #

WR^2 = 968 # FT^2

MATERIAL AQUALOY

QUALITY ISO CLASS 2 TRACK, SURFACE, STATIC BALANCE,

BLADE LOCATION, RAKE

ISO CLASS 1 PITCH

PAGE 2 DOCUMENT # 678-C605-03 REV. A

NOTES

� ANTI-SINGING TRAILING EDGE FROM 0.5 TO 0.95 R.

� LEADING EDGE GAGES TO BE SUPPLIED BY PROP. MFG.

� THE PROPELLER MAY BE SURVEYED AT THE MFG. BY

CT MARINE BEFORE DELIVERY TO OWNER OR YARD

HUB DIMENSIONS: - DETAILS TO BE CONFIRMED BY SHIPYARD

LENGTH APPROXIMATELY 13”,

OD AT L.E. APPROXIMATELY 10”

I.D. OF BORE AT L.E. 5"

CLASSIFICATION: BUILT TO ABS CLASS FOR INLAND TOWBOAT.

NOTES ON PITCH SELECTION

NOMINAL PITCH FROM THE NSMB DATA FOR KA 4- 70 = 56”

% RADIUS PITCH

PITCH DISTRIBUTION .3 50.1 INCHES

.4 52.0 .5 53.7

.6 55.1 .7 56.1 .8 56.6

.9 56.1 .95 55.0

1.0 53.8

WEIGHTED AVE. PITCH 55.5 INCHES

PROPELLER SHOULD BE STAMPED “ 52” X 55.5” VAR. ”

NOTE:

THIS EVALUATION HAS BEEN CAREFULLY PREPARED TO MEET

PROFESSIONAL STANDARDS. SINCE IT IS NOT ALWAYS POSSIBLE TO

DETERMINE THE ACCURACY OF PROVIDED DATA, NOR CAN ALL OF

THE REQUIRED HYDRODYNAMIC ASSUMPTIONS RELATED TO THE

HULL, MACHINERY, APPENDAGES AND PROPELLER BE 100%

ACCURATE, CT MARINE ASSUMES NO LIABILITY NOR MAKES ANY

PERFORMANCE GUARANTEES OF ANY KIND FOR THIS DESIGN. FINE

TUNING THE PITCH OF A NEW PROPELLER TO BETTER MEET THE

ACTUAL OPERATING CONDITIONS IS NOT UNCOMMON, AND THIS

WOULD REQUIRE DRY-DOCKING THE VESSEL.

CT MARINE 16 Jun 2005 11:10 AM Page 1 Displacement/Optimum propeller Project: MOBILE.NC3

A.C.O.E. M/V "PATOKA" REPLACEMENT (3) X 670 BHP IN CT28 NOZZLES

DOCUMENT # 678-C605-03 REV. A

---------- System 1 -------------------------------------------------------

Description: 3 X 660 IN NOZZLES Series: Kaplan 19A Scale corr: None Blades: 4 Kt mult: [ ]Std 0.990 Exp area ratio: [ ]Opt 1.0000 Kq mult: [ ]Std 1.040 Diameter: [ ]Opt 52.00 in Blade t/c: [ ]Std 0.000 Pitch: [ ]Opt 55.50 in Roughness: [ ]Std 0.000 mm Cav breakdown: [ ]Apply Propeller cup: 0.0 mm

Engine file: C:\NAVCAD3.9\670@2100.ENG Rated RPM/hp: 2100.0 / 670.0 Gear ratio: 5.030 Gear efficiency: 0.975

---------- Selection parameters -------------------------------------------

Load identity: Shaft power Design speed: 7.75 mph Cav criteria: Manen line Reference load: 653.3 hp Load design point: 100.0 % Reference RPM: 2100.0 RPM design point: 100.0 %

---------- Analysis results -----------------------------------------------

Sys Vel Rtotal WakeFr ThrDed RelRot EngRPM PropRPM mph lbs RPM RPM

1.00 0 0.5500 0.1500 1.0000 2100.0 417.5 1 7.75 0 0.5500 0.1500 1.0000 2100.0 417.5

10.00 0 0.5500 0.1500 1.0000 2100.0 417.5

Sys Vel J Kt Kq PropEff HullEff QPC OPC mph

1.00 0.0219 0.6007 0.0552 0.0379 1.8889 0.0717 0.0710 1 7.75 0.1696 0.5089 0.0559 0.2458 1.8889 0.4643 0.4596

10.00 0.2189 0.4801 0.0551 0.3032 1.8889 0.5728 0.5671

Sys Vel Thrust Delthr PD/prop PS/prop PB/prop mph lbs lbs hp hp hp

1.00 19878 50688 629 635 651 1 7.75 16841 42943 637 644 660

10.00 15886 40510 629 635 651

Sys Vel Fuel MinP/D TipSpd %Cav Press MinBAR mph gph fps psi

1.00 *** 0.629 94.7 0.0 4.5 0.9171 1 7.75 *** 0.660 94.7 0.0 4.5 0.9295

10.00 *** 0.673 94.7 0.0 4.5 0.9171

HydroComp NavCad v3.90.0076.S129

CT MARINE 16 Jun 2005 11:10 AM Page 2 Displacement/Optimum propeller Project: MOBILE.NC3

A.C.O.E. M/V "PATOKA" REPLACEMENT (3) X 670 BHP IN CT28 NOZZLES

DOCUMENT # 678-C605-03 REV. A

---------- Condition data -------------------------------------------------

Water type: Standard Fresh Mass density: 1.9384 slug/ft3 Kinematic visc: 1.2260e-05 ft2/s

---------- Analysis parameters --------------------------------------------

Pitch type: FPP Low speed: 1.00 mph Number of props: 3 High speed: 10.00 mph Shaft efficiency: 0.990 Prop immersion: 33.00 in Analysis type: Tow

---------- Symbols and Values ---------------------------------------------

Rtotal = Total vessel resistance WakeFr = Taylor wake fraction coefficient ThrDed = Thrust deduction coefficient RelRot = Relative rotative efficiency EngRPM = Engine RPM PropRPM = Propeller RPM

J = Advance coefficient Kt = Thrust coefficient Kq = Torque coefficient PropEff = Propeller open-water efficiency HullEff = Hull efficiency = (1 - ThrDed)/(1-WakeFr) QPC = Quasi-propulsive coefficient OPC = Overall propulsive coefficient

Thrust = Open water thrust per propeller Delthr = Total delivered thrust per propeller PD/prop = Delivered power per propeller PS/prop = Shaft power per propeller PB/prop = Brake power per propeller

Fuel = Fuel consumption per engine MinP/D = Minimum P/D ratio to avoid face cavitation TipSpd = Linear velocity of the propeller tips %Cav = Percent back cavitation Press = Propeller blade pressure MinBAR = Minimum expanded area ratio

* = Exceeds Limits

HydroComp NavCad v3.90.0076.S129

CT MARINE

ABS MINIMUM SHAFT SIZE FOR RIVER TOWBOATS

DOCUMENT # 678-605-03 REV. A

L < 150 FT USE THE 1997 UNDER 90 m RULES

L > 150 FT USE THE 1997 RIVER RULES

MAY 13, 2005DATE

204 1410PROJ

COE REPLACEMENT TOWBOAT, MOBILE DISTR.VESSEL

AQUAMET 22 SHAFT MATERIAL

FT95VESSEL LENGTH OVERALL

2100ENGINE RPMIF L < 150

5.03RATIO3.55C1

23180C2

SEE TABLE 4/7.21.29K

AGE HARDCONTNO 680H

STAINLESSLINERSLINERS417.495R

1350008700060000130000U

INCHES4.329ABS MINIMUM D. =

PCT0.100CT MARINE RIVER FACTOR

INCHES4.76SUGGESTED MIN. DIAM CTM

INCHES0.37SUGGESTED LINER

USE

INCHES5.00DIAM

SLIP ON CHROMALOYINCHES0.38LINER

INCHES5.75JOURNAL