Bollard Pull Calculations for Ships

(10 customer reviews)




This Excel sheet calculates the required Bollard Pull to tow a conventional ship shaped vessel.

It rigorously calculates all the forces on the vessel, viz.

1. Calm Water Resistance: It is calculated using the established Holtrop and Mennen formula

2. Wind resistance: Based on Wind Height and Shape coefficients from ABS MODU rules, and corrected for wind direction.

3. Wave Resistance: From DNV Rules for Marine Operations, and corrected for forward vessel speed using Faltinsen, 1990

4. Propeller resistance and Hawser resistance: From US Navy Towing Manual

Useful in Marine Operations. It can be used to predict the bollard pull to tow a vessel. The tug can be accordingly selected.

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10 reviews for Bollard Pull Calculations for Ships

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  1. Navaltik Portugal (verified owner)

  2. Saeed Khorram (verified owner)


  3. Hans Langsrud (verified owner)

  4. Lex van der Schaaf (verified owner)

    Works fine, little bit difficult to enter all parameters, as some unknown beforehand, outcome indications are however in line with reality.
    Maybe useful to limit input a little bit, if possible and make the program more userfriendly.

  5. m Lankford (verified owner)

    I have other product from The Naval Arch, that I have been using for the past 6 years, with ease of inputs it has assisted in my daily operations as a marine surveyor.
    With all products there is full support, and updates

  6. Jan Edeling (verified owner)

    Worked well, thank you

  7. IGNACIO SANTANA (verified owner)

    Is a easy procedure for calculate the BP. user friendly.

  8. Jonathon Pearce (verified owner)

    Excellent calculator but users need some knowledge on inputs which is good at academic level but not so much in practice.

  9. Carl Henrik Frankman (verified owner)

    Especially the presented / calculated default values for certain input assisted with incomplete / unreliable information by the client. Here is also I see the greatest potential for improvement. Many of the coefficients can be estimated using thumb rules. Providing these would further enhance the programs usage, especially in a salvage context.

    • Team TheNavalArch (store manager)

      Thanks for the feedback Carl. We look to implement them in the next version

  10. Hu Xinbing (verified owner)

    A very good calculation app .

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FAQs on Products

Important: Our excel-based products work only on Windows machines, and not on Macs

System Requirements:

MS Excel 2013 and up

Windows 7 and up