Shock reduction in planing boats

Details Shock reduction in planing boats Shock reduction in planing boats

1999-12-09

2000-12-12

Morano, S. Joseph

Ships

Hull or hull adjunct employing fluid dynamic forces to...

Having hydrofoil

114284, B63B 124

Patent

active

061583766

ABSTRACT:
A system is disclosed to reduce the impact shock associated with operating a planing boat at high speeds. The system, called "LocalFlex," comprises an outer bottom placed under the inner bottom of the boat. The outer bottom is spaced a distance from the inner bottom. The outer bottom comprises two plates. Each plate is connected to the inner bottom along or near the keel, and along or near the chine. Along the keel, each plate of the outer bottom is attached to one or more hinges or pins rigidly suspended from or below the keel of the inner bottom. At or near the chine, each plate is connected to the boat by one or more springs. The elastic modulus of the plates and that of the springs are selected so that the outer bottom deforms under the pressure spike of an impact in a whip-like flexure that smoothly directs the pressure spike past the chine. After the spike passes the chine, the pressure diminishes and makes no further significant contribution to impact slamming. Thus impact acceleration can be reduced as much as 50% or more.

REFERENCES:
patent: 3270701 (1966-09-01), Kubas
Ando, S., "Cushioning of Slamming Impact by Elastomeric Layers," J. Ship Res., vol. 33, pp. 169-175 (1989).
Gollwitzer, R. et al., "Shock Mitigation on High-Speed Planing Boats," CSS/TR-94-33, pp. 12-13 (Nov. 1994).
Meyerhoff, W., "Die Berechnung hydroelastischer Stosse," Parts I and II, Schiffstechnik, vol. 12, pp. 18-30 (1965).
Meyerhoff, W., "Die Berechnung hydroelastischer Stosse," Part III and IV, Schiffstechnik, vol. 12, pp. 49-64 (1965).
Vorus, W., "A Flat Cylinder Theory for Vessel Impact and Steady Planing Resistance," J. Ship Res., vol. 40, pp. 89-106 (1996).
Vorus, W. et al., "Shock Reduction of Planing Boats," Appendix J in Gulf Coast Region Maritime Technology Center Quarterly Report, Jul.-Sep. 1997 (published Dec. 15, 1997).
Vorus, W. et al., "Shock Reduction of Planing Boats," Appendix J in Gulf Coast Region Maritime Technology Center Quarterly Report, Jan.-Mar. 1998.
Vorus, W. et al., "Shock Reduction of Planing Boats," Appendix J in Gulf Coast Region Maritime Technology Center Quarterly Report, Apr.-Jun. 1998.
Vorus, W. et al., "Shock Reduction of Planing Boats," Appendix J in Gulf Coast Region Maritime Technology Center Quarterly Report, Jul.-Sep. 1998 (not yet published as of the filing date of this application).
Wyman, D. et al., "Gentle Performance Wedge (GPW) Shock Mitigating Planing Boat Hull," United States patent application filed approximately Aug. 8, 1996, serial number currently unknown, Navy case 77536.
Wyman, D., Navy Submission of Invention Disclosure dated Feb. 20, 1990.

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