In this article 'ski jumps' are referred to as 'ramps' (must be USMC speak):
The STOVL Joint Strike Fighter in Support of the 21st Century Marine Corps
"The most significant contribution that the Navy could make to STOVL air and helicopter-borne power projection is adding a ramp (ski jump) to all Tarawa- and Wasp-class amphibious ships."[76] It is ironic that although the US is the largest operator of Harriers and amphibious ships in the world, it is also the only navy in the world that does not have ramps on its Harrier platforms. The UK, India, Italy, and Spain all have ramp-equipped ships that optimize the combat power of the Harrier. The British discovered that if the ship's deck were curved upward the last 100 feet or so, the aircraft would exit the bow with a ballistic trajectory (speed builds up during the ballistic portion of the flight until the aircraft attains normal wing-borne flight).
The US Navy studied ship designs featuring ski jumps with exit angles of up to 12 degrees but rejected the concept as too costly in design weight of the ship and perceived loss of helicopter spots.[77] The ramp for Harrier operations significantly improves aircraft performance, payload, safety, and deck utilization. A ramp not only dramatically improves a STOVL aircraft's takeoff performance, it facilitates concurrent fixed-and rotary-wing operations afloat.[78]"
Discussion might be useful to this forum?:
http://www.defencetalk.com/forums/navy- ... ed-8977-3/