Regarding Post 20 and some of the responses: I have to agree that a boombrake is of little use in a high wind accidental jibe. IMHO Preventers should be single-part, and stretchy
line (nylon) run from the end of the boom to the bow and then back to the cockpit. The purpose of the stretchy
line is to absorb shock and should be rigged to be quickly and easily eased from the cockpit to allow the boom to swing over comparatively gently.
Jeff