Hi Jamie,
Interesting project. If you are looking for accuracy, it is not realistic to cover 520 nm in two days in a small sailboat unless you are you open to using a catamaran. The reason is, that would require sailing an average of about 11 kts/hour. Monohull keelboats have what’s called a “hull speed.” They cannot sail (or motor) through the water faster than approx. 1.34 x √LWL (in feet). Translated, a monohull would need a waterline of almost 70 feet to sail that fast.
With perfect conditions, wind strong enough to keep the boat at hull speed the entire time, without factoring in current, a monohull with a 30 ft waterline could cover the distance in about 3 days. So that would be your minimum time on a boat about 35 – 40′ length overall. Factoring in an adverse current and four days is probably more realistic.
There are a number of excellent Nordic builders (which would probably make the most sense). Including Arcona, FinnFlyer, FinnGulf. CR Yachts, Linjett, Malo, Marin, Maxi, Najad, NautorSwan, Ohlson, Sweden Yachts, X-yachts… I’m sure there are more.
Hope this helps.
