Bulbous Bow Design Parameter Calculator


All products are in English, except as indicated on specific product pages. Annual subscription includes all future product updates as long as subscription is paid. Perpetual licenses as forever, however, major future product updates will require an upgrade purchase. Apps that are excel-based work on Windows PC, with Windows parallels needed to run on Macs. File Download links are shown immediately after purchase, and also sent by email. The product needs to be activated upon purchase. The activation key is sent by email after the purchase and has the format "email address-order number". For example, if the email address used for the purchase is [email protected], and the order number is 9999, the product key is [email protected] For any issues post purchase, write to [email protected]
Report Abuse
SKU: N/A Categories: , , Tags: , ,


This Excel sheet helps the user to
1 Decide if a bulb is suitable for your ship parameters.
2 Tweak the parameters to bring the ship into the froude number zone where a bulb is suitable
3 Calculate all the bulb parameters suitable for the vessel.

Instructions for use
The input table in IO-COMPUTE work sheet needs the following inputs
Parameters Symbol Units
Draft to Baseline T m
Length at Waterline L m
Beam at design draught B m
Block co-effN Cb
Midship area co-effn Cm
Speed V knots

1 “Design Optimization of the Lines of the Bulbous Bow of a Hull Based on Parametric Modeling and Computational Fluid Dynamics Calculation –
Weilin Luo i,ii and Linqiang Lan ii
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China;
Fujian Province Key Laboratory of Structural Performances in Ship and Ocean Engineering,Fuzhou 350116, China”
2 Design & Construction of Bulbous Bow – Manuel Ventura
3 Website – Ulstein : https://ulstein.com/innovations/x-bow
4 Design Principles of Ships and Marine Structures – Prof. S.C.Mishra
5 Basic Ship Propulsion – Prof. J.P.Ghose & Prof. R.P.Gokarn
6 “The Theory of the Bulbous Bow and Its Practical Application
W. C. S. Wigley
North East Coast Institution of Engineers and Shipbuilders, 1936 – Shipbuilding”
7 “Kracht (1970), “A Theoretical Contribution to the Wave-Resistance
Problem of Ship-Bulb Combinations: Verification of the
Negativeness of the Interaction Term”, Journal of Ship Research,

Version History

Version Date
0.0 9-Jun-20


Additional information

License Type


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Questions and Answers

You are not logged in