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Tuesday, November 29th 2005, 3:43am

The Three Faces of Otta

The Three Faces of Otta

Collier

Laid down in early 1915, the collier Bhima was the fourth of six medium colliers to be built for the Bharatiya Nau Sena. The class was capable of carrying four thousand tonnes of coal at a speed of fifteen knots. Two rows of scoop-shovels accessing small hatches amidships allowed coal to be transferred to ships tied up on either beam. The class would permit the projection of Indian naval influence across the width of the Indian Ocean and into the western Pacific.

A support role for raiding operations was one envisioned role for these ships. While India did not formally take part in the Great War, there is some evidence that the older vessels of the class did supply the German cruiser Emden from time to time during its long rampage in the Indian Ocean.

Bhima’s older sisters also kept the navy supplied with the coal it needed to fight the larger Dutch East Indies Fleet to a standstill in 1916-17, the lead ship, Godavari, being sunk by a Dutch submarine during the war. Bhima herself was, however, only completed a few months after the Treaty of Honalulu brought the conflict to a close. Three years of uneventful service followed as she was based in the Central Maritime District. In mid-1920, she was caught up in a cyclone that inflicted modest damage to her upper works and entered the shipyard at Chennai for repairs. As it turned out, it would be over a year before she returned to service.

Experimental Aircraft Carrier

Indian naval strategy was in flux in 1920. The old notion of building up a larger littorial naval force, based on squadrons of cruisers, was being shoved aside by the idea of a true blue water force. While this force would not be able to defeat a navy such as that of the Netherlands, it would pose a threat to imperialist holdings and serve as a valuable diplomatic tool while India set out on its quest to rid Asia of European colonizers.

This new strategy led India to be involved in the naval arms limitation talks that resulted in the Cleito Treaty of 1920. A major and unavoidable risk of signing on to this treaty was that India had not built capital ships or carriers, and would likely find itself stuck with a white elephant for twenty years the first time it made the attempt. With an alliance being forged with South Africa over the latter half of the year, fears of botching a capital ship faded as the prospect of South African technical assistance became stronger. However, the South Africans were only just starting to think of aircraft carriers themselves.

During the course of negotiations, it became evident that the treaty would include a clause allowing for existing experimental aircraft carriers to be replaced by the mid-twenties - quite a bit sooner than would be possible for a ship built after the treaty came into effect. The navy decided that it was better off to start a rudimentary carrier program too soon, and experiment with a platform they could legally replace in five years, than to wait, do more research, and hope the first try was up to twenty years of service.

Finding a ship to convert was not so easy, though. The merchantile losses of the war had not been made good, and prices for freighters and passenger ships were still relatively expensive. The navy contemplated completing the cruiser Male, then under construction, as a small hybrid. It contacted Atlantis about obtaining a battlecruiser that had already been converted, but realized that it would be too expensive to operate. Then somebody noticed Bhima.

The reconstruction began in the fall. The derricks and superstructure were ripped apart and replaced with a basic hanger serviced by two lifts. A full length flight deck, sloping downward at the bow, was installed. Exhaust was diverted to a pair of funnels abaft the flight deck aft. Guns and search lights were installed in four sponsons, and a heavy pole mast installed on the port side for lookouts and signal lamps. No island was contemplated, the ship’s command facilities being located in a bridge overlooking the bow. Although Bhima was technically completed in 1921, work continued on portions of the ship through to early 1922.

The ship was re-commissioned under a new name, the navy having decided that it would name aircraft carriers after weapons. The choice of name - Otta (the term for a heavy club) was rumored to be a jab at the new carrier’s bulky form and slow speed.

As a carrier, Otta was far from ideal. Her machinery had not been replaced, so she was still limited to fifteen knots, and dependent on coal that sent plumes of dark smoke rising from her funnels. Her airgroup was tiny, peaking at twenty-four aircraft, and the small deck and slow speed restricted the size of aircraft that could be carried. The ship’s living spaces were as spartan as any warship to see service in the navy, and the lack of an island made it difficult to control flight operations. On the other hand, she was a good sea boat and had a slow roll that helped those flight operations.

Over the next few years, Otta would be based primarily in the Western Maritime District at Mumbai. The navy used her to develop operating procedures: how and where to fuel and arm aircraft, how to use the aircraft, how to escort the carrier, and so forth. She was employed in naval exercises with South Africa and with India’s SATSUMA allies. The ship’s inadequacies led to her being used boldly, even aggressively, both in exercises and in a strike against Danish warships during the Andaman Sea crisis of 1924. Thought not materially effective - four Dhairya bombers being lost in exchange for a single hit on a destroyer - it gave both India and Denmark, and probably other nations, a sense of what an aircraft carrier could accomplish.

All of this operational experience led to the design of India’s first purpose-built carrier, Urumi, which was laid down in 1925. Larger, faster, armored, and better armed, Urumi’s completion in mid-1927 meant that Otta had to be taken out of service. There was considerable debate about whether to convert her to a seaplane tender, aircraft transport, repair ship, or whether to just scrap her. Consensus at the time was that a repair ship was most urgently needed, and that a seaplane tender, while useful, could be built effectively on a much smaller hull. This, Otta entered a drydock for an extensive reconstruction.

Repair Ship


This time, Otta’s machinery was replaced, with smaller but equally effective oil-fired engines and increased bunkerage being added. Crew quarters were improved upon, and portions of the flight deck were removed to make way for workshops and warehouses. Two large cranes were installed such that they would have access to the elevators and the hanger-turned-warehouse areas they serviced. Two smaller cranes were placed in a derrick amidships to access small shuttered hatches servicing the workshops there. Around the base of the derrick was built a central observation area to coordinate the transfer of equipment to and from the ship.

The aft armament was retained, as were the light guns forward. The forward 10.5 cm guns were removed, one being re-sited forward on the centreline, the other being used for an anti-submarine launch being built nearby. The spaces left behind by the 10.5 cm guns were filled auxiliary conning stations. The pole mast once sited in the forward port gun sponson was moved to the leading edge of what had been Otta’s flight deck, placing it outside the turning radius of the heavy cranes.

Otta’s re-commissioning in mid-1928 was followed by a shakedown cruise, and then a prompt deployment to the Red Sea to assist the monitor Chandragupta after its engagement with a rebellious Filipino cruiser. The ship patched numerous holes from six inch shells, replaced equipment such as a twin 10.5 cm gun mount, and repaired the monitor’s gutted crew quarters, taking the monitor’s entire surviving complement aboard for the duration. After several weeks, the two ships sailed to Mumbai where dockyard facilities undertook tasks Otta could not, such as un-jamming the monitor’s 25 cm triple turret. Otta sailed east to provide forward support to Indian warships involved in the Filipino revolution, arriving on station in January 1929.

Her value already proven, Otta looks to have many years of service ahead of her in support of Indian missions across the Indian and Pacific Oceans.


Below: The three faces of Otta: collier (top), carrier (middle), repair ship (bottom)



2

Tuesday, November 29th 2005, 3:51am

That's great stuff.
:-)

(Bets are now being taken on how long it will be before Manzo tries to land on the abbreviated deck aft... ^_^)

3

Tuesday, November 29th 2005, 4:52am

The crane operators will be trained to recognize Manzo and whack him aside if he gets within reach.

If nothing else, Otta should be well equipped to deal with the aftermath of a "successful" Manzo landing.

HoOmAn

Keeper of the Sacred Block Coefficient

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4

Tuesday, November 29th 2005, 1:47pm

Interesting summary of one of WesWorld´s most active warships.

Well written. I wish I could have such a file for all of my ships in the encyclopedia section....

Thanks for posting,

HoOmAn

5

Tuesday, November 29th 2005, 2:22pm

I've just realised what an awful place those funnels are in for carrier operations. The smoke from them would go directly into the landing path for aircraft. With coal-firing I'm surprised any aircraft actually landed on her.

The bridge is very low and in a seaway would be very limited in its usefulness. Better to have another open bridge higher up at the same level as the 37mm guns. Capacity for the cranes? (counterweight?)

6

Tuesday, November 29th 2005, 2:35pm

The funnels are badly sited, agreed. But that's where I put them when I drew her the first time, and I didn't want to revise the drawings now.

Can't answer the crane question. I have no comparable data for historical ships of the type.

The bridge remark is something I'll look into, though.

7

Tuesday, November 29th 2005, 7:57pm

I second the comment on her funnels, them seem to be placed too far back. Her hull form at top veiw seems to compound this in addition to making her bridge awefully cramped in addition to being in a possition to get a nice
"three sisters" doorknocker.

Even H.M.S. Furious with her flying off deck experienced some structural damage forward caused by waves.