Meeting Notices


Join the Hampton Roads Section of SNAME for:
Single Point Mooring in High Winds
By Jonathan Soja


 6 PM Tuesday, Feb 13th


Hampton Roads Yacht Club

4707 Victoria Blvd

Hampton, VA 23669


6:00 PM – Social time
6:30 PM – Dinner

7:00 PM- Presentation
8:30 PM – Adjourn


Full-Time Students: $15, Members: $20, Non-Members: $30


 By Friday, Feb 9th to Davy Hansch (Sname.Meetings@gmail.com)


  “Single Point Mooring in High Winds




There is a delicate balance that must exist between the aerodynamic, hydrodynamic, and mooring forces acting on a floating body restrained by a single anchor (single point mooring).  If the balance is not achieved, the floating body will exhibit undesirable motions which have been referred to by the industry as horsing, fishtailing, kiting, and "sailing about at anchor."  Significant work related to the offshore oil industry documents these yaw instabilities on single point moorings; however, the knowledge base is not very well disseminated outside of the offshore sector, especially when considering that vessels of all types are susceptible to this phenomenon. 
When the aerodynamic forces dominate the hydrodynamic and mooring forces, no matter the vessel type or configuration, the potential for the undesirable motions to occur exists.  With the increased desire for larger interior volumes on vessels, hull and superstructure windages are trending larger and the aerodynamic forces acting on the vessels are becoming more significant, making the phenomenon a more common occurrence.
This presentation provides an introductory overview to the phenomenon of yaw instability of a vessel on a single point mooring, and documents a technical investigation into the phenomenon.  The research program conducted consists of full-scale sea trials, aerodynamic analysis through computational fluid dynamics, numerical simulations, and physical scale model testing.  Results of the research program are presented which demonstrate successful replication and mitigation of the motions.



Author Biography:


Jonathan Soja is a Project Manager at Donald L. Blount and Associates (a Division of Gibbs and Cox).  A 2013 graduate of Webb Institute, Jonathan started his career at DLBA immediately after school as a Naval Architect performing stability, structure, and performance analyses for a variety of commercial and recreational vessels including vessels with high speed requirements.  He has been involved with multiple yacht refits and post-delivery modifications/support for various craft.  Taking on responsibilities as a Project Manager, Jonathan has been involved in the extensive modification of a break bulk carrier to accept container storage, design of a 64ft high speed pilot boat, and various small craft stability and structural analyses.




Meeting Schedule

Feb 13, 2018- Single Point-Mooring in High Winds @ Hampton Roads Yacht Club 6pm

Mar.13, 2018-Colonna Shipyard Tour Time TBD

April 10, 2018- Student papers @ Hampton Roads Yacht Club 6pm

May 8, 2018- topic TBD @ Hampton Roads Yacht Club 6pm


Payments can be made through PayPal at the below link or in person:

Student Dinner- $15

Member Dinner- $20
Non-Member dinner- $30

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