Academic literature on the topic 'FFG-7 Frigates'

The effect of a stern flap on the powering performance and annual fuel consumption of an FFG-7 Oliver Hazard Perry Class Guided Missile Frigate is presented. Analytical analysis using free surface potential flow theory was conducted to evaluate the flow on the afterbody of the ship. Model tests were conducted to determine the optimum geometrical characteristics of the stern flap. Based on the analytical and model test results, a stern flap was retrofitted to an FFG-7 Class frigate, and full-scale results on powering performance were collected. Results of model powering experiments showed that the flap, set at 10 deg trailing edge down, decreased the delivered power by 8.4 percent at 26 knots, and provided for a 3.8 percent decrease in annual fuel consumption. This decrease in annual fuel consumption places the payback period on the cost of the flap installation at only 10 months. The full-scale comparison of the flap's effectiveness was marred by adverse weather conditions and differences in the pre-and post-flap ship configurations. However, observations of the full-scale stern wave system, before and after the installation of the stern flap, lead the authors to conclude that the flap will produce a larger decrease in delivered power at full scale than shown by the model experiments.

The focus of this thesis is on the acquisition of major capital equipment within Australia's defence system. For the purposes of this analysis, major capital equipment constitute selected projects with a total value of at least $200 million. The projects selected for examination are from each of the three arms of the military service. These projects are: the Royal Australian Air Force's BLACKHAWK helicopters, the Army's PERENTIE vehicles, and the Royal Australian Navy's Australian FFG-7 FRIGATES. These projects were chosen because they share similar planning and management related characteristics. They represent substantial public sector investments. The technology used in each of the systems is available 'off-the-shelf but the way in which the systems were ultimately assembled and produced are uniquely Australian: this adaptation and local innovation involved developmental work. Since each of these projects is almost complete, a comprehensive analysis of the project has been possible. The study of these particular projects provides the basis for a comparative analysis of the acquisition of major defence projects, and facilitates the development of project planning and management 'lessons'. Since current Australian public (and private) sector policies seek to maximise the use of leading edge technology by adapting it to meet specific local requirements; the examination of these three projects provides an objective determination of the validity of such policies.

The United States Navy uses the General Electric LM2500 gas turbine engine for main propulsion on its newest surface combatants including the OLIVER HAZARD PERRY (FFG 7) class frigates, SPRUANCE (DD 963) class destroyers, TICONDEROGA (CG 47) class cruisers, ARLIEGH BURKE (DDG 51) class destroyers and SUPPLY (AOE 6) class oilers. Currently, the Navy operates a fleet of over 400 LM2500 gas turbine engines. This paper discusses the ongoing efforts to characterize the availability of the engines aboard ship and pinpoint systems/components that have significant impact on engine reliability. In addition, the program plan to upgrade the LM2500’s standard configuration to improve reliability is delineated.

In this paper we investigate the resistance and seakeeping effects of an inverted bow by comparing the motions of an existing combatant hull, the Oliver Hazard Perry class frigate (FFG-7), with a modified version of the hull with an inverted bow. The bow of the FFG-7 was redesigned by developing a set of basic curves that define the parametric surfaces of the new shape. Two 1/80th scale models were tested for resistance in calm water and seakeeping in both regular waves and irregular head seas. The differences between the FFG-7 and the inverted bow responses are characterized in terms of pitch and heave motions and vertical accelerations.