Some grist for the USMC non-existent skijumpmill. Plenty of USN/USAF testing of various ski jumps with various aircraft has been carried out over the years.
STOVL Air Power | The Ramps, Roads, and Speedbumps to Exploiting Maneuver Air Warfare
Major Charles R. Myers, 01 April 1996
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Amphibious Ships
page 9:
“...The skeptics insist that ramps will displace landing spots. Tests prove otherwise. On a 12 degree ski jump approximately 150 feet long, the slope gradually increases from zero up to 12 degrees at the bow. The first half of the ski jump has a slope no greater than that of an LHA during wet-well operations with the well-deck flooded – both Harriers and helicopters can land on it...." [Major Art Nalls, USMC, "Why Don't We Have Any Ski Jumps," U.S. Naval Institute Proceedings, November 1990, 81.]"
http://www.dtic.mil/dtic/tr/fulltext/u2/a527872.pdf (50 Kb)