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Paper Title: Suspension Boat Dynamics



J L Grenestedt, Lehigh University, USA


Small boats operating at high speeds often see very high vertical accelerations, which impose large loads on the boats as well as on their occupants. A boat concept with suspension was developed to reduce vertical accelerations. It consists of a centre-hull that is generally not in contact with the water and one or more sponsons connected to suspension links, springs and shock absorbers. Numerical simulations were performed on a simplified 4 degree-of-freedom model operating in seas generated from wave buoy data. A suspension boat with the general size and mass of an NSWRIB 11 meter boat was analysed and optimized. The analyses indicate that the suspension boat could operate at 60 knots in sea state 3 without seeing vertical accelerations above 1.5 G. The same boat but with rigidly mounted running surfaces would see an order of magnitude higher vertical accelerations. 


Transactions RINA, Vol 155, Part B1, International Journal of Small Craft Technology, Jan-Jun 2013 

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