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BuildingA Liftable Propulsion System

for Small Fishing Craft

THE BOB DRIVE

by

o GulbrandsenConsultantNavalArchitect

andM R Andersen

SmallCraftSpecialist (APO, BOBP)

Bay of Bengal ProgrammeMadras, India

1993


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INTRODUCTION

Motorizationof small fishing craft hascontributed considerably to fisheriesdevelopment inthe Bay of Bengal region over the

last few decades. In Indonesia. Thailand andBangladesh the most common enginesby far for small fishingcraft, are the5 - 15 hp range of multipurpose diesel engines used for water pumps, generators, power tillers and small tractors. Theadvantagesof thistype of engine, compared withthe specially marinized diesel engine,is thelow cost and easy availabilityof both engines and spareparis.

Two methods for the installationof these engines havebeen developed andwidely introduced.

The conventional inboard installation, where the propellershall is fittedthrough thekeel structure,is usedin boats operatingfrom harbours or sheltered beaches.

In the longtail installation, the engine Sits on top of thetransom andthe propeller shaftgoes through a long tube to thepropeller.

These two methods of installations are, however, notsuitablefor boats that haveto land on surf-beaten beaches.

The Bayof Bengal Programme (BOBP) undertooka project fordevelopment of beachlandingcraftand theirpropulsionsystemsinIndia and Shri Lanka in 1979. Themain challenge wastodevelop a propulsionsystemthatcould be fitted to a variety ofair-cooled and water-cooled diesel engines that were available locally, provide goodmanoeuvrability when crossingthe surf,permit rapid retraction of thepropellerandtherudder andbe strong enoughto withstandboth the impact when landingon thebeach and the rough handling by users.

Only outboard motors had previously proved satisfactory for surf crossing, but, exceptin the case of small craft, this solutionhadeconomic limitations due to its high operatingcost andthe short service life of the motor Further, outboard motorshavetobe imported fromJapan, Australia, Europe or the USA, while the multipurposekerosene ordiesel engines are now manu-factured,or assembled, inmany developing countries.

Thismanual describes thefinalversion of the liftable propulsion systemdeveloped by BOBPandcalledthe BOBDRIVE. TheB0B Drivehas undergonelong-termtrialsinIndia andShriLanka andbeen found tobe acceptableto fishermen operating fromopensurf beaches andfrom shallowwateroutlets. Avariety of fishingcraft, from FRPbeachlanding craftandplywoodcanoesin India to narrow outrigger canoes in Shri Lanka, have beenfitted with the BOBDrive and it hasworked satisfactorilyin allof them.

Thismanualis intended tobe used by skilledmechanics insmall workshops having a lathe and welding equipment It shouldalsobe of interest toengine manufacturers,boat builders,teachersinlisheries training institutes andextension workers in small-scale fisheries.

The projects for development of fishing craft, including liftable propulsion systems for beachlanding and negotiatingshallowwater outlets,were sponsored by the Bay of Bengal Programmes project Small-Scale Fisherfolk Communities inthe BayofBengal (GCP/RASI118/MUL). Theywere executed by national fisheries institutionsand BOBP in cooperation with engine

manufacturers and dealers, boatyards, engineering workshops andfishedolk.

The Bay ofBengal Programme(BOBP)is a multiagencyregional fisheriesprogramme whichcovers seven countries aroundtheBayof Bengal - Bangladesh, India, Indonesia, Malaysia, Maldives, ShriLanka andThailand. The Programmeplaysa catalylicandconsultative role: itdevelops, demonstratesand promotes new technologies, methodologiesandideasto helpimprovetheconditions ofsmall-scale lisherfolk communitiesinmembercountries. The BOBPis sponsoredbythe governmentsof Denmark,Sweden and theUnited Kingdom,andalso by UNDP(United Nations Development Programme)andAGFUND (ArabGulf FundforUnitedNations Development Organizations). Themainexecuting agencyis the FAO (Food and Agriculture Organization ofthe United Nations).

This manual,prepared by O.Gulbrandsen, NavalArchitect Consultani, andMr M.R. Andersen, SmallCraft Specialist, BOBP,isthe result of the workdone byBOBP staff,Varuna Construction & Design, Madras, fisheries officers andall those who wereinvolved inthe developmentandtrials of theBOB Drive. It hasnot been cleared bytheGovernments concerned or the FAO.

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______ 1 9

Rod D =65, L =80 Alternativetube ID =24 1 9

RodD =

48, L 30

Alternative tube ID =

24 1

10Propeller 1 5,6

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LISTOF MATERIALSFORSIDE ORTOPMOUNTEDENGINE

Doesnotinclude:

(a) Alternative largerudder, page 22

(b) Freshwater cooling systemand coolingoil intunnel, pages 29, 30

(C) Seawatercooling system,page31

(d) Forwardmountedengine,chassis, flexible stuffingbox andtunnel, pages34, 3536

(e) Tunnel, watertightbulkheadandrudderplatform, pages23, 24, 25, 26

NOTE: Unless otherwisestated,all dimensionsarein mm.Itmetricsizesarenot available,usenearestequivalentininches.

Abbriviations:L =Length, D =Diameter, ID = Inner diameter,T =Thickness

ITEM OTY. PAGENOS.

Plate,T=6,400x600 1 14,33

Plate,T=8,75x130 1 8

Flatiron,6 x 40,L =1200 Seealternative 1 16

Flatiron;6 x 50, L =2000 1 14

Flatiron,8 x 50,L =600 1 15,27

Flatiron,15 x 100. L =600 1 8,9

Flat iron,20 x 40,L =1000,Top mountedL =1200 1 17

Rod,D=32,L=145 1 . 15

Rod,D=45,L=105 1 15Rod,D=60,L=45 1 19

TubeOD =60.3,T =6.3, ID 47.7,L =1570 1 8

TubeOD=13.5,ID=7.7,L=20 1 9

Channeliron6x40x75,L=1000 1 27

PlateT=4,65x170 1 20

Strip2x25,L=320 1 21,22

Strip3x 40,L =1200 See alternative 1 16

RodD =

6 ,L =

1200

See alternative 1 16RodD=10,L=330 1 20,21

RodD=16,L=260 1 20

RodD =35, L =45 Alternative tube ID =24 1 10

PropellerShaft D =25.4 or D +28,L =1470 1 10

Tube 1 1/2ASTMSCH 5S, OD=48.3, ID =45,L =70 1 10

Tube 1/4ASTMSCH 10S, OD =13.7, ID 10.4,L =60


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38

15

28

28

21

21

21

21

HexBoltM6x 75

HexBoltM 10 x 75

HexBoItM 10x 100HexBoltM12 x 50

HexBoltM12 x 120 Alternative 12 x 200 for topmounted

ITEM OTY. PAGENOS.

2

8

64

2

2

14

10

2

14

2

5

2

2

14

8

3

26

27

25,2618

17,33

12, 13

19,27

20

19

10, 19

9, 12

8,9

10, 12

10, 12

12, 13

12,38

HexNutM6Hex Nut M10

Hex Nut M12

WasherM 6

Washer M10

StudM10x50

Hex Bolt M lOx 30

Hex Bolt M 10 x 60

Hex Bolt M 16x 60

Hex Nut M 10

Hex Nut M 16

Spherical roller bearing SKF 22205 CC or equivalent

Oil Seal OD = 47, ID = 32, B = 7

Key, Stainless steel 316, 6 x 6 x 35

Key, Stainless steel 316, 6 x 6 x 40

Washer, Stainless steel 316, T 3, OD 32, ID = 17

Quick coupling, hydraulic 1/4

Grease gun with flexible hose and quick coupling

Grease cup No. 4, 1/4 BSP

Grease 2kg 1 12,38

V-belt pulleyfor engine, cast iron 1 5,11

V-belt pulleyfoL propellershaft,castiron 1 5, 11

V-belts 1

set 5, 18Bellows,neoprene

Hoseclip, Stainlesssteel, D 190

Rod, Copper5x t60

Timber, heavy, sawn, 65 x 1400 (for2

Timber, heavy, sawn, 40 x 200 x 1400(for 2)

Timber, heavy, sawn, 32 x 200 x450 (for 2)

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Top mounted VSTair-cooleddieselengine BOB Drive

Top mounted VSTair-cooled dieselengine BOB Drive installedin BLCIND-25

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6.7 m FRP beachiandingcraft, IND-25, fittedwith top mountedVSTair-cooled diesel engineBOBDrive

8.5 m timberoutriggercanoe, SRL-18A,fittedwith top mountedYanmarair-cooled dieselengineBOBDrive

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ForwardmountedLombardini air-cooled diesel engineBOBDrive installedin FRP beach nava

9.1 m FRP beach nava fitted with forward mountedLombardini air-cooled diesel engineBOBDrive

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Sidemounted VSTwater-cooleddieselengine BOB Drive

Side.mountedVSTwater-cooled diesel engine BOB Drive installed in plywoodcanoe

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8.5 m plywood canoe, IND-28A, fitted with side mounted VST water-cooled diesel engineBOBDrive

8.5 mFRP beachianding craft, IND-20,fittedwith sidemountedVSTwater-cooled dieselengineBOBDrive

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