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Naval Aviation Firsts Leading the way in Innovation Ski-Jump In the 1970s Lt Cdr Doug Taylor invented the ‘Ski-Jump’. This upwards curving ramp at the forward end of the flight deck ensures that the aircraft is launched on an upward trajectory giving considerable performance gains, including much greater payload and range, than a corresponding flat deck, short take-off. 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Team JSF (TJSF) comprises Lockheed Martin, BAE Systems and Northrop Grumman and will produce the JSF aircraft in three variants: 1.4 F-35B STOVL lift and propulsion system optimisation for F-35B conventional take-off and landing (CTOL); carrier based variant (CV); and a short take-off and vertical landing (STOVL) aircraft. This paper deals The F-35B has a number of unique elements that facilitate its STOVL with the STOVL aircraft, designated capability, and these are critical in the optimisation of a ski jump ramp F-35B, which is currently selected by the UK as its Joint Combat Aircraft profile for the aircraft. A basic description of the layout and function of the (JCA), to be operated by the Royal Navy and Royal Air Force replacing lift and propulsion system is shown in Fig. 2 and described below: the existing Harrier fleet. ● a Lift Fan driven by a shaft from the main engine which provides A. Fry, R. Cook and N. Revill vertical lift through a variable area vane box nozzle using louvered vanes to vector thrust between vertically downwards and partially aft. [email protected] 1.2 overview of the CVF programme ● a three-bearing swivel module (3BSM), which vectors the main The Future Aircraft Carrier (CVF) programme is managed by the Aircraft engine exhaust thrust from the core engine through vertically Carrier Alliance (ACA), an industry and government consortium, and will downwards to fully aft – the latter being the default for conventional produce two new carrier vessels entering service from 2014 to replace the mode flying. BAE Systems existing Invincible class of ships and is illustrated with the F-35B in Fig. 1. ● roll nozzles, ducted from the engine and exiting in each wing These carriers will act as the UK’s mobile air-base, operating and providing roll control and vertical lift. These are closed off during the Warton supporting a wide variety of aircraft in support of UK expeditionary opera- initial portion of the short take-off (STO) in order to maximise tions – obviating the need to rely on other countries co-operation. The forward thrust from the main engine, opening towards the end of the UK THE AERONAUTICAL JOURNAL FEBRUARY 2009 VOLUME 113 NO 1140 embarked air group will primarily consist of JCA but will also include 79 ramp in order to provide control and lift during the fly out. Airborne Surveillance and Control, Maritime, Support, Attack and Battlefield helicopters depending on the mission. In the Carrier Strike role, up to 36 JCA will be embarked, capable of 2.0 THE SKI JUMP RAMP operating in all weathers, day and night; providing a long range strike capability in addition to air defence and offensive support to the fleet and ground troops. 2.1 Background and history of the ramp 1.3 CVF integration support program The ski jump ramp was conceived by a Royal Navy officer in the 1970s and subsequently developed by the UK services, industry and Government This program and team was established as part of TJSF and tasked to as a way of increasing the STO launch payload for the Harrier. It has since provide existing and newly generated engineering information to support become an integral part of embarked operations for UK and most foreign the ACA in the integration of F-35B with CVF. Harrier operators. The first operational ramp was fitted to HMS Hermes (see Fig. 3) in 1979 and was a 12 degree ramp; as defined by the angle to the horizontal of the tangent at the last point on the profile. The Invincible class of Anti-Submarine Carriers (CVS) were modified during building to accommodate the Sea Harrier aircraft and were ABSTRACT NOMENCLATURE completed with a 7 degree ramp in the early 1980s. This lower angle was chosen to avoid obstructing the firing arcs of the Surface to Air Missile This paper presents a summary of the principles and processes used to 3BSM 3 Bearing swivel module system fitted to this class although giving less launch performance benefit. design a ski-jump ramp profile for the UK’s Future Aircraft Carrier (CVF) ACA aircraft carrier alliance Due in part to the success of the Harrier in the 1982 Falklands war these optimised for the Joint Strike Fighter (JSF). CG centre of gravity ramps were replaced by a larger 12 degree design later in the 1980s. The ships and their ramps have given valuable service to the UK through to this The paper includes an overview of the CVF and JSF programs, a history CTOL conventional take-off and landing day with successive generations of the Harrier family, as Fig. 4 illustrates. and summary of the ski-jump ramp and the principles of its use in the CV carrier variant shipborne Short Take-Off (STO) manoeuvre. CVS anti submarine carrier Invincible The paper discusses the importance of defining optimisation boundaries (descriptor for the class of ships) CVF UK future aircraft carrier project including specified objectives, aircraft configurations and environmental CVFIST CVF integration support team conditions. It then demonstrates the process of balancing the design drivers Figure 1. Artists impression of CVF and F-35B. DEFSTAN UK MoD defence standard publication of air vehicle performance and landing gear loads to achieve an optimum Dstl Defence Science and Technology Laboratory profile. Comparisons are made between the proposed candidate CVF ramp EC environmental condition (e.g. Hot/ISA day) profile and the current in service ski-jump design as designed for the JCA UK joint combat aircraft project Harrier family of aircraft. JSF Joint Strike Fighter The paper briefly covers some of the important issues and factors that SDD system development and design phase have been experienced when a theoretical profile is translated into a STO short take-off physical ramp fitted to a ship, principally the effects on aircraft operations STOVL short take-off and vertical landing
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