Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
I sail with the keel fully lowered at all times. I think most others do as well. You would have a serious problem if the keel were to free-fall. As far as I know, there is no keel locking device on a Cat25.
Except for haul-outs and shallow anchorages, I keep the keel fully lowered, with a tiny bit of tension on the cable. It weighs 1500 lbs, and there is no locking device. You don't want the cable and winch system to have to support that kind of weight while sailing.
You loose the advantage of a lowered center of mass and compromise some pointing ability by having the keel only partially lowered...under the right (wrong) set of circumstances (wind direction and force, waves, etc...) a knock-down is not out of the question...having said that, last week the O/B died on the way in and we needed to sail into the marina and the slip - as it was low tide, we came in w/ the keel up and under a mostly furled genny, no mainsail ...fortunately the wind was mild - actually barely enough to keep us moving and I had the kids sit on the rail anyway.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.