This always grabs the ire of other members out there who dissagree with me (and rightfully so), but I feel the sea trial is a joke. I personally feel it is a great way to get out there with the owner (if possible) to have him walk you through sailing the boat and any nuiances... but chances are that you will not find major system issues on a sea trial. Now I would like to preface this with an observation that many people HAVE found issues during the sea trial. But for the most part, the deal is done then. Chances are that even marginal systems will hold together for a few hours... and I think you will have an interesting time talking the owners into serious bang-up cruise to put the systems to the test (a long weekend or serious passage). THe problems with that boat will show up weeks/months later.
You mentioned that the owners might have been away from the boat for some time except weekending. This always sends up a red flag for me... depending on their description of weekending. Boats that just sit create more problems than boats that are used. Sellers know this as do brokers. Thus, the "weekending" comments. Examples of things that are succeptible to just sitting are gaskets (like the head, for example), diesel in the tank, water in the tank, and engines in general. A boat that just sits at the marina will typically look nice on the outside and inside. However, most systems on a boat do not fare well just sitting.
Hylas makes a great boat... one of the best. SO I would focus on items that are not Hylas realted, like the engine,
pumps, etc. If you can swing the money for an engine survey, it may be the best money you have ever spent. I just am not a big fan of sea trials... for reasons stated above. You will knw whether you want the boat before she leaves the dock... and the suprises will hide until they can really be suprises.
Just my opinions that many dissagree with.
- CD