Nakul class of tugboats are series of service watercraft built by Tebma Shipyard Limited. (a subsidiary of Bharati Shipyard Ltd), for Indian navy during 2004. The vessels in the class have a rated capacity of 25 ton bollard pull. Propulsion is provided by Voith Schneider Propellers. It is a follow-up of Madan Singh class tugboat.
| External images | |
|---|---|
| Nakul Class | |
 INS Nakul | |
| INS Arjun | |
| 25 T BP Voith Tug(Nakul) |
| Name | Date of commission | IMO number [1] |
|---|---|---|
| INS Nakul | ||
| INS Arjun | 2004 | 9069669 |
The specifications are from the website of the manufacturer Tebma Shipyard Ltd. [2]
Bollard pull is a conventional measure of the pulling power of a watercraft. It is defined as the force exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test under test conditions that include calm water, no tide, level trim, and sufficient depth and side clearance for a free propeller stream. Like the horsepower or mileage rating of a car, it is a convenient but idealized number that must be adjusted for operating conditions that differ from the test. The bollard pull of a vessel may be reported as two numbers, the static or maximum bollard pull – the highest force measured – and the steady or continuous bollard pull, the average of measurements over an interval of, for example, 10 minutes. An equivalent measurement on land is known as drawbar pull, or tractive force, which is used to measure the total horizontal force generated by a locomotive, a piece of heavy machinery such as a tractor, or a truck,, which is utilized to move a load.
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