Stub keel is more like it
The keel on the 22 is a very short fin; so short it really is a stub. In fact, it looks very similar to the keel on the 23, only the 23's keel has a centerboard that swings down to give you almost 6 feet of draft. I have never sailed on an O'Day 22, but have heard that they can't hold a course going to weather very well. I have sailed my 23 when the centerboard was stuck in the up position, and I can say that she sailed better than I thought she would, although not nearly as well as she does with the board down.I bet the owner of the 22 is telling you the truth: the draft is minimal, probably less than three feet, and it probably is no more difficult to ramp launch than the 23 with the board up. The one thing I have heard about trailering the 23 is that its weight makes it a beast; you need a real towing vehicle and lots of strength and patience during launching. I don't think the 22 weighs that much less than the 23. You might want to check out the specs of the boat on this site.