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{{short description|Take-off ramp for aircraft}}
[[File:Carrier Sea Training MOD 45166691.jpg|thumb|A [[Lockheed Martin F-35B Lightning II]] taking off from the aircraft carrier {{HMS|Queen Elizabeth|R08|6}}]]
In [[aviation]], a '''ski-jump''' is an upwardly curved [[ramp]] that allows a [[fixed-wing aircraft]] to [[takeoff|take off]] from a [[runway]] that is shorter than the aircraft normally requires. By providing an upward [[vector (mathematics and physics)|vector]] from the ski-jump's [[normal force]], the aircraft is launched at an elevated angle and lift-off can be achieved at a lower [[airspeed]] than that required for flat takeoff, as it allows the aircraft more
It is believed that the first use of the ski-jump occurred during the [[Second World War]], when a temporary ramp was added to {{HMS|Furious|47|6}} to help heavily laden [[Fairey Barracuda]]s attack the German battleship {{ship|German battleship|Tirpitz||2}}. During the [[Cold War]], the concept was studied as a means of reducing the length of [[flight deck]]s required for aircraft carriers and to facilitate ever-heavier aircraft at sea. The [[Royal Navy]] took a particular interest in the ski-jump during the 1970s, conducting tests with the new [[Hawker Siddeley Harrier]] [[VSTOL]] fighter, then added a ramp to its next generation of aircraft carrier, the {{sclass|Invincible|aircraft carrier|4}}.
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