Steve Davis wrote..... "The nature of this design is, essentially, a true trawler hull form." And "But remember, this is essentially a sailboat hull with ballast." I doubt this hull has any relation to a fishing vessel, but it may have a bit in common with sailing hulls. I assume he means this is a full displacement hull and intended to be efficient at low (well below hull-speed) speed. A typical sailing yacht of this size would carry over 30% of her displacement (weight) in an external ballast keel, the Fantail is nothing like this. SD wrote..... "We designed her to be extremely efficient and in fact she requires only 28 shp to make hull speed." "Hull-Speed" is often defined as the square root of waterline length multiplied by 1.34. Guessing the Fantail waterline is approximately 40', hull-speed is about 8.5 knots. He doesn't mention at what displacement she would require only 28 HP at. At something between 40 and 50,000 pounds displacement this boat will go roughly (with clean bottom and no appendages) 6.5 knots with 28 HP at the propeller. SD wrote.... "She has considerable stability and, in fact the fly bridge version was more comfortable as the moment of inertia was increased which reduced the period of roll." The first part of the above statement is meaningless; I may well be an endless nitpicker but "considerable stability" does not answer any questions for me. The second section of the sentence refers to motion, which is a different subject than stability. Adding a flying bridge raised the VCG, increasing the roll inertia is comparable to a figure skater spreading her arms to slow a spin. The boat will roll more slowly, but it will roll farther (higher heel angle) and the angle of vanishing stability (ultimate stability) is reduced due to shorter GM. Increasing the roll moment of inertia will increase the period of roll rather than reducing it. Period of roll is a completely subjective matter, some are more comfortable with the slow roll, while others are happy with a quick jerk upright. In normal cruising the slower roll is more comfortable for most people, it only becomes a concern when things go badly wrong. Tad Roberts www.tadroberts.ca <http://www.tadroberts.ca/> www.passagemakerlite.com <http://www.passagemakerlite.com/> [demime 1.01d removed an attachment of type image/gif which had a name of image001.gif]