The Story of Rojomolo

A. The History of Baito Kyai Rojomolo

Rojomolo have complete name Baito Kyai Rojomolo, it is a special wooden boat on Kasunanan Surakarta Kingdom was built on  1780 by RMG Sugandhi. He is the crown prince Sri Susuhunan Pakubuwono IV. And later on, he will raplace his father to be king, and have tittle Sri Susuhunan Pakubuwono V.

On that time, RMG Sugandhi mother just passed away. His mother is a princess come from Madura Island. After his mother passed away, his father take new empress, that new empress is RMG sugandhi mother young sister. But later on, his father triffle away his new mother. Because of that, he think to repatriate his new mother back to madura. For that reason, he start to built wooden boat to use it bring his new mother back to Madura Island.

But when wooden boat is going on progress, his father fill moved with his son strunggle to make wooden boat. And last moment his father ask to him to stop his plane to repatriate his new mother back to madura island. And use the new wooden boat which RMG sugandhi to be ship tourism to run on Bengawan Solo river.

B. Mystery A Form of Kyai Rojomolo Wooden Boat

Kyai Rojomolo is uniqe wooden boat, people only knows story about that wooden boat. But no body knows the real form that wooden boat. On 2005 when I was Study on Marine Engineering Dept, Sepuluh Nopember Institut of technology (ITS) Surabaya, for my final duty to got my bachelor degree I try to open that wooden boat mystery.

Acctually before my research, Mr Rachmat Adiyanto has research from kyai rojomolo wooden boat hystory. And in the same time with me, I got friend from STSI Solo to research together, but she concern on the Art of Kyai Rojomolo wooden Boat. So at least has 3 people has take research for kyai rojomolo wooden boat, hystory side, Art side, and Technically side.

For my research bassically I try with 3 methode, first I take data from old kingdom familly story, second I take data from hystory book of Babadan Kyai Rojomolo, and the last one I try to make comparrison between old wooden boat building methode with modern wooden boat building methode.

For first methode, I take data from Gusti Puger storry. He is head of Sonopustoko (Library) Kasunanan Surakarta Kingdom. and he is young brother from PB XIII Hangabehi. He told me that :

1. Rojomolo wooden boat has gone, and no body know how, why, and when that's wooden boat has gone.
2. Kyai Rojomolo last seen rest on pesanggrahan langenharjo.
3. This wooden boat has been the kingdom wooden boat, and would use king, when he want went to madura island through Bengawan solo river.
4. This wooden boat have special compartment, and that's compartmen have gamelan (java traditional music equipment), Stage performant, and leather puppet. On this compartment, kasunanan king, ussually enjoy with watch tradisional java art like dance, sing, and puppet.
5. Last one and still exist untill now part of this wooden boat is Canthik Kyai Rojomolo this is like Dragon Head on chinnes wooden boat.

And then I take data with interview with Mbah Hadi, lead of Radyapustaka library. Same like gusti puger told to me that Rojomolo is big wooden boat, use for king of kasunanan kingdom transportation boat from solo to madura. And last time when bengawan solo floaded, king using rojomolo wooden boat to walk around solo, to watch and inspect his theritory, to makesure the floaded affect to his people. And after that the king will distribute what his people need to minimize the floaded affect.

Second Methode.

On this methode I take data from old hystory book of rojomolo wooden boat. That's book is Babadipun Kagungan Dalem Baito Kyai Rojomolo. I got this book on sasono pustoko (Kingdom Library) Kasunanan Surakarta Kingdom. On this book mentioned that rojomolo made from Jati Wood. And other data as followed :

1. Name of  Wooden Boat     : Baito Kyai Rojomolo
2. Time of Building                 : 18 A
3. Boat Builder                      :  RMG Sugandhi
4. Type of Boat                      : Wooden Boat
5. Wooden Type                   : Jati Wooden

Main Boat Dimension

1. Lengt of Boat                            : 115 Kaki (old java dimension) simillar with  36 Meter
2. Width                                       : 21    Kaki simillar with 6.6 Meter
3. Lenght of Main Accomodation  : 109 Kaki  simillar with 34.5 Meter

General Arrangement Boat : 

 

Bilge Pipe System

Ship when run on the sea will be dangerous when some water come in inside on the ship. If water that water little bit only may be can make corrosion on the ship, like on the floor, ship equipment like pump, valve etc. Moreover if there is puddle in side ship can cause mosquitoes can live and may be that mousqitoes can bring malaria disease or dengue faver, and this is will be dangerous for ship crue. If the water come with much capacity will give effect on ship stability or on worst condition ship will be colaps.

To avoid above condition, on ship have bilge system. This system use for take water inside ship to take out it. On some class give Lay Out of Bilge Line regulation about this as follow :

1. Germanischer Lloyd, on GL rules Machinery and System Chapter 3/11 Bilge system mentioned Bilge lines and bilge suctions are to be so arranged that the bilges can be completly pumped even under disadvantageous trim condition. Bilge suction are normally to be located on both sides of the vessel, for compartment located fore and aft in the vessel, one bilge suction may be considered sufficient provided that is capable of completly draining the relevant compartment. 
2. American Bureau of Shipping, on ABS rule 4-6-4/5.1.2 Basic Principles Bilge System mentioned : a.Function, A bilge system is intended to dispose of water which may accumulate in space within the vessel due to consideration, leakage, washing, fire fighting, etc. It is to be capable of controlling flooding in the propulsion machinery space as a result of limited damage to piping system   b.Cross flooding prevention, The system is to be designed to avoid the possibility of cross flooding between spaces and between the vessel and the sea.   c.System availability To anhace system availability, bilge pump integrity is to be assured through testing and certification; at least two bilge pumps are to be provided, and bilge suction control valves are to be accessible for maintenance at all time   d.Oil Polution Prevention. Provision is to be made to process oily bilge water prior to dischargeing overboard.

Bilge system consits of : Pumps, Motor to runs pumps, Piping, and Control devices.

Bilge pump used for transfering bilge water from some bilge area to bilge holding tank or take out it dirrectly. There are some class requirement must follow for bilge pump.

1. Bilge pump capacity, depend on ABS steel vessel rules 2012, when only 2 bilge pumps are fitted, each is to be capable of giving a speed of water through the bilge main required by 4-6-4/5.3.1(a) of not less than 2 m (6.6 ft) per second. the minimum capacity Q of the required Bilge Pump may be determined from the following equation :                                        

   

1. Bilge pump capacity depend on GL rules Sea Going Ship, Section 11 Piping system, Valves and Pump, Letter N Bilge System point 3.1 Capacity of bilge pump mentioned that each bilge pump must capable of delivering 

Where centrifugal pumps are used for bilge pumping, they are to be self priming or connected to an air extracting devices. We can use other pump use for bilge pump like Ballast pump, stand by sea water cooling system pump and general service pump they are self priming and of the required capacity according to above formulla. For fuel and oil pump are not to be allowed to be bilge pump.

For minimum bilge pipe size, as follows :

1. Depend on GL rules :

           
             

                       

Pipe System on Ship

Ship like on land building, they need some system to support their operasional. on ship can be collected to be 3 category pipe system based on their function :

1. General Ship Support, on this system pipe have function to support ship operasional dirrectly. there are : Ballast system, Bilge system, Air vent system, Sounding pipe, over flow system, sanitary water piping (frash water, Sea Water, Hot Water), gray water and black water system, internal and external system.
2. General Machinery Support System, on this system pipe have function to support all engine and equipment on ship so all that engine can run well. there are : fuel oil system, lube oil system, sea water cooling system, fresh water cooling system, starting air system, exhaust gas system.
3. General pipe operational system, on this pipe system they have special function to support specific ship operational. There are : Oil Water Sparator system, Reverese Osmosis system, Cargo loading and un-loading system, Steam  System, boiler feed water system, condensate system, thermal oil system.

3 category pipe system mentioned on above, work together on ship. But not all of them use on ship but based on ship requirement. some ship need 1 system pipe but on other ship may be that system not used.