It's not a bad option to have and cheap to do. One of the major Mac dealers in the upper midwest whose name and website I have temporarily forgotten (might be boats4sail in Wisconsin) recommends that kind of an arrangement over a roller furler for those who trailer a lot. It's cheap, and I'm all over that concept.

These old Macs definitely fit the bill for affordability and usability in Texas lakes, and your enthusiasm for yours is well-justified. My primary gripe is lack of headroom in the cabin, and the no-man's-land under the cockpit, but you can't have everything in a 22 foot trailerable sailboat.
You will get varied opinions about locking the keel down under sail. I never have and don't intend to because I like to be able to adust the depth as needed. Some will regard this as blasphemy and at least one guy who has taken one on a 3000 mile ocean cruise will say it was designed to be adjustable according to need. Your results may vary. As an experiment, you can head her into the wind with the keel up, and count how many turns down it takes before you start to make forward progress to get a feel for the minimum you need down to get the job done.
Early on, I did my best to heel this one over far enough to get something catastrophic to happen, but I couldn't get 'er done. I was able to get water to pour into the cockpit, but it righted itself before we took on much water. The hull/deck joint leaks on this one when you bury it in the water, but no biggie. My understanding is that this is common. You will hear concerns about the keel smashing into the trunk during a blowdown and causing hull damage, but I couldn't get that to happen either. My guess is that it would take higher waves than I have encountered for that to occur. Just a hunch. (Hey, I can swim, and the wife's shrieks aren't loud enough to cause permanent hearing loss.) I suppose this seems reckless or stupid, but we experienced as much worst-case scenario as we could from the get-go and were able to go forward with an educated perspective of the boat's capabilities and our reactions in less than ideal conditions. Mac's don't make much progress into the wind in a heavy blow, so it's kind of pointless to be out there unless you're caught unawares by a storm or you're looking for experience.
We cussed the local weather guy a few times before we found
http://www.sailflow.com. It does a pretty good job of predicting what kind of wind will be available.
cookwithgas wrote:McTexan:
Thanks for the excellent advice. I think I'll put a downhaul on the jib right away. Looks like a great idea! I did a fair amount of bottom dragging with the keel this weekend at PK. I'll keep an eye out for plant clutter. thanks again.
Aubrey Scott in Texas