Autobiography of an Indian Naval Architect

Autobiography of an Indian Naval Architect

By Capt Mohan Ram (Indian Navy)

I came across this book, which was mailed to me by one of the readers of this blog site and I am not sure that the author has published it or not.

The book is an interesting read, though it doesn’t cover much that is relevant to the naval architecture field. The author Mohan Ram was an ex-captain in the Indian Navy and was one of the earliest officers to join the Corp of Naval Constructors of Indian Navy, which is an offshoot of Royal Corp of Naval Constructors (UK), after India got its independence. An alumnus of the prestigious Indian Institute of Technology, Kharagpur, the author served the Indian Navy for a span of twenty five years. During this brief span the author had the distinction of serving in various capacities in the Dockyards and the Naval Design organizations. Though the author claims, he is one of the foremost naval architects of India, I am pretty sure that not many in the Naval Architectural world would have heard of him. He has not published any papers or made any theoretical contribution in the field of Naval Architecture. But considering the primitive state of naval architecture in India during those days, it is possibly true that the author could have been India’s foremost Naval Architect.

Notwithstanding the above, the book is an interesting read, especially from the point of historical development of India’s indigenous capabilities in the designing of ships.

The primitive state of Indian Navy’s Naval Architectural capabilities is brought out in one of the eureka moments which the author had……….

“ On a wet Saturday afternoon I was doodling on a piece of paper at home and idly wondered “what would happen, if I powered the new ship with the same power plant- two turbines of fifteen thousand horsepower each, without any change. How much would the speed drop? Was there any chance of convincing the naval staff that a small sacrifice in top speed would make the ship more economical and easier to construct?” I did a quick back-of-the envelope calculation to estimate the speed loss. To my utter surprise, the answer came out that the ship did not lose speed at all. On the contrary it would go a full knot faster, at 29 knots which the naval staff wanted! I checked the numbers again and again and could not find any mistakes in the calculation. I tried other methods for estimating the power required and found that the answer came out the same. I was elated. Perhaps this was a brilliant solution for meeting the navy’s requirement without any additional investment, using equipment being manufactured in India. I was so excited about my discovery that I could hardly sleep the whole weekend.”

“I rushed to the office on Monday and announced my discovery. No one believed me at first. I was greeted with a stony silence and most of my colleagues, thought that I had gone out of my head. I could not blame them, as my findings were totally counter-intuitive.”

“Without sounding too technical, let me simply explain how this came about. Further analysis revealed that at lower speeds the resistance to ships’ motion was primarily due to friction, in which the larger ship with about 20% greater wetted surface area (area exposed to the water) was at a disadvantage. Above 22 knots, the resistance to motion from wave making due to the ship cleaving through the sea became much more prominent than friction. If the interference between the waves created by the bow (front) of the ship and the stern (rear) of the ship were positive, resulting in a crest at the rear end, resistance due to wave making would be lower. If the interference between the bow and stern wave systems resulted in a trough at the stern, the resistance due to wave making would be higher. The interference is a function of a factor called Froude number, which relates the square of the speed of the ship to the length of the ship. In the case of the Leander at 28 knots, the interference caused a trough at the stern increasing the wave making resistance. But in the new longer ship, the interference resulted in a crest. This resulted in a lower wave resistance in the bigger ship, which more than compensated the increased drag due to greater area. Overall this led to the bigger ship going faster. Once we had done this detailed analysis the picture became a lot clearer. We also found that the same principle was being adopted in ‘jumboizing’ super tankers to by adding a new mid section, making the ships longer to carry more crude without losing speed.”

The very fact, that the obvious result that larger ships (of similar Geometric proportions) could have lesser resistance compared to ships of smaller length, because of the cancellation of the wave fields (a fact taught in the basic courses of Resistance of Ships), was such a shocking eye-opener to the Stalwarts of Indian Naval Architecture Community speaks volumes of their technical ignorance of Basic Naval Architecture and goes on to show that Mohan Ram, when he claims himself to be one of the foremost Naval architects of India, could indeed be speaking the truth.

The second half of the book deals with the author’s life as a non-practicing naval architect in the Indian Industry. Interesting, but not relevant to Naval Architects. The author claims that he was responsible for the turnaround of some loss making companies and offers some management platitudes.

“I expect this story to be of interest to senior managers of organizations facing severe competition and loss of market share and running into decline and sickness. It should provide useful insights, as it spans my experience of working in all three sectors, government, PSUs and the private sector. It should also be useful to academic institutions and students of management, as the book brings live Indian cases to light. Management consultants might find some of the events and solutions relevant and interesting. Multinational corporations and foreign institutional investors may find the narrative useful in getting a clearer understanding of the Indian psyche and corporate scene, some of its unique problems and possible approaches to their solutions.”

Overall a good book, especially for those in India in the Naval Architectural profession.

The book is not openly available in the internet as of date. I had read it, courtesy, one of my blog readers who had emailed it to me. He is one the members of a yahoo group called “Constructor County” which is a group which caters to the Naval Architecture Fraternity of India (only??? I am not sure).

However surprisingly while browsing the net, I found it here.

The author would have possibly uploaded it.