My goal was not to argue but to show what your claims were based off of. Maybe next week or ten years from now someone in the market for a boat in that category will Google it for some information on one and your post with your claims of "The spars are very light and prone to breaking under significant load" or "The hull/keel joint is weak and prone to damage in a grounding" will show. With no one challenging your claims they might seem credible. Then the fact that this is based off of maybe a total of 4 boats out of the 100+ that were built and no actual evidence of keel failure or a mast folding in half hopefully they will dismiss these claims and move on with there search. We all have opinions on different boats some good some bad but to say spares are prone to failure with significant loads which are what? Or the keels are poorly attached then I would like to know the testing you went through to come up with those results that in all my research have never heard off. The reality is you don't know what those loads are nor do you know the strength difference between the keel attachment of a mirage or any other bolt on keel of a boat in its category I have no clue either and would never claim to. If you worked for the company back in the 80s and knew of warranty claims then it would be hard to argue but that is not the case. I just find it funny to watch the years go by and people trashing certain boats mostly "production" ones. With many of them reaching close to forty years old with masts still up and keels still attached. Without worry I will continue to sail mine for years to come leaving the experts in disbelief.
Stating "My goal was not to argue", after a lengthy contradiction to one post and preceding another, speaks volumes.
You appear to disagree with my opinion (fine), but having no logical argument against it, have begun attempting to attack my credibility (not cool).
Never-the-less, here is my rebuttal to this tactic.
I have completed extensive studies in Electrical, Electronic, and Mechanical engineering at the Canadian community college level.
I am an ABYC member. (This is the association of industry experts that develops marine safety standards for construction and repair.)
I am an ABYC certified Marine Systems Technician.
I have also completed extensive formal studies in welding and small engines.
I own a yacht service company, and work full time, personally repairing yachts for my many clients.
Among my client base includes 4 Mirage owners, one 24 and three 33s.
I have performed a significant body of work on these vessels and other makes and models.
I am intimately familiar with the engine installed in this vessel and have found it to be light in comparison with others of similar size and displacement, and especially with more robust cruising vessels.
I am a Yanmar dealer.
I have raced and cruised sailing vessels extensively for over 20 years.
I have had several sailing and sailboat repair articles published in respected US and Canadian Yachting publications.
I have and continue to deliver seminars to boating interest groups on the safe and effective repair of yachts.
I have been a member, executive director, vice commodore, and then commodore of a Canadian Yacht Club.
I have reviewed and evaluated Mirage 33 spars, and found them to be of generally weak construction compared to similar and especially to more robust cruising vessels.
I have installed thru-hulls in Mirage 33s and found them to be balsa-cored.
IMHO, this construction is not desirable in a cruising vessel, as the increased potential damage due to moisture ingress, is not worth the fractional increase speed in light airs. (Most cruisers who cannot make 3+/- knots to the good, often just start the engine.)
I have removed factory installed thru-hulls and found the balsa core to be sealed solely by marine adhesive/bedding compound, having a life expectancy of approximately 15 +/- 5 years, barring any physical force which could break this seal earlier and at any time.
I have reviewed, evaluated, rigged, and tuned the M33 mast, and found it to be of relatively light design and construction.
I have a M33 boom in my shop right now that I am working on (poor reefing system performance.)
I have consulted an owner whose boom snapped near the gooseneck as a result of an accidental jybe with preventer on.
I have reviewed and evaluated Mirage 33 keel attachments, and found them to be of inferior design and weak construction compared to other vessels.
I have repaired hull/keel join fractures on 2 vessels are retorqued the keel bolts on one.
This is my business, my livelihood, that I stake my reputation on every day.
Do I know everything?
Not by a long shot.
Despite all of my training and experience to date, I keep my mind constantly open to new ideas and concepts.
I am enrolled in continuing education in the marine industry.
It is a rare day that I have not learned something new.
However, I believe I am well qualified to speak to the qualities of these vessels with which I am intimately familiar, in comparison to other makes and models, that I have also worked on extensively from virtually every aspect of marine repair.
If you personally wish to disregard my opinions, please do so.
If you feel your only strength of rebuttal is to attempt to attack my credibility, please don't.
In summary, IMHO, the Mirage 33 is an excellent performance cruiser if the emphasis is on performance and not so much on robust construction and durability.