I must say I absolutely find the Mantra 28 interesting. Like a modern (fast) Vega? A bit strange that a boat that is presented as an offshore (circumnavigation) boat is only category B. But there might be requirements to get the category A that is impossible to furfill for a 28 feet boat?
. welcome to the thread and to Sailnet.
Yes, you are right regarding category A and I want to say that I am not endorsing a 28ft boat as a bluewater boat and that personally I would be very reticent in crossing the pond in one less even in circumnavigating in one. It obviously can be done and with a reasonable risk margin, since that boat had circumnavigated several time. Happens that to me a reasonable margin is not enough, I want a big safety margin
That does not mean that the Mantra 28 is not a very seaworthy boat for its size and also a well built one. No 28ft boat could survive 4 circumnavigations if it was not a strong and well built boat. I find the Mantra 28 remarkable as a mass production boat but the comparison with the Vega only is valid if, as you say, we consider the time where they were designed : Both are two great answers for the same design criteria separated by 45 years of design and technological improvements.
The Albin Vega is a 1967 design:
It is a narrower boat and a full keeler with a sail area/displacement of 16.5. The Mantra 28 is a modern design, beamier (2.70m to 2.46m), with a modern keel with much more draft ( 1.65m to 1.12m) with almost all the weight in a bulb. It has not only a superior stability as it is much faster. It has also more interior space.
The interior is not its stronger point even if it looks functional:
But look at this Dimensions:
Look at this hull:
If I was looking for a small cruiser with offshore capacity I would certainly would go to Poland to look at this one and to know if they cannot do a better job on the interior. Well, I can design it
All the rest seems very good to me in what regards hull design and the very good B/D ratio (36%). I like it and probably the price is an agreeable surprise. Polish boats tend to be not much expensive. Maybe they can tell us about that
mY mantra 28