Good posts so far, but you can't get much simpler than the preventer I use:
tie a stout line to the aft end of the boom, run it forward outboard of the
shrouds, in through a hawse, pull on it hard, and cleat 'er home.

GREAT peace of mind.

Fair winds,

Dick Behan


"Sting" wrote in message
...
Does anyone have any recommendations for rigs to prevent an accidental
gybe.
My boat is a 34 foot sloop.
Having just had the scariest experience of my life taking my unconscious
brother in law to casualty this weekend following a boom/head incident,
I'm
keen never to repeat the experience.
Bye the way - bottom line is concentration lapsed and I took my eye off
the
changing wind direction but something to restrain the boom in future would
be reassuring.