The 'Evolution,' as her name implied, was the logical outcome of the then tonnage rule, and of the laws of resistance rediscovered, or at least popularised, by Froude. It seems self-evident now that with a belief in these laws only one type of boat could be the result; but Mr. Froude alone had the courage of his opinions, and built the extraordinary 10-tonner which, if it did nothing else, scared the authorities into changing the tonnage rule. 'Evolution' was by far the longest of the 10-tonners, her dimensions being 51 ft. × 6 ft. 6 in.—indeed about the same water-line length as the twenties. To get moderate wet surface the ends were cut away; but as 'Jullanar' already represented the utmost that could be done in that direction, while preserving a fair line of keel, this was cast aside in 'Evolution,' and the profile was that of a true 'fin' boat. More than this, it was found after a trial sail or two that she was very deficient in stability when the lead slab forming the keel was recast in the form of a bulb on the bottom of the plate, the completed design simply forming one of our modern bulb fin keels, but of course, owing to the 94 rule, with vastly less beam. 'Evolution' was not a success because of her insufficient stability, but with the meagre data in possession of the designer as to the stability of boats of this class, it would have been marvellous had the difficulty been overcome in a first trial. To those able to see the beauties in a design, it matters less whether the ultimate outcome has been successful or not, and while to 'the general' nothing succeeds like success, a few have a kindly sympathy and hearty admiration for those who have laboured, that we may enjoy the increase. Many of the best and kindest thoughts and brightest ideas never reach fruition in this world, and so in the mechanical arts there is often more genius displayed in a failure than in a success, with this difference, that a mechanical idea seldom dies, but, 'blossoming in the dust' of one brain, is plucked and worn by another. 'Evolution' lay dead for fifteen years. She has had a striking resurrection on both sides of the Atlantic.
'Evolution,' October 12, 1880, 10 tons, Y.R.A.
Designed by E. H. Bentall, Esq.
In the autumn of 1886, as has been stated, the tonnage rule was changed to that of rating, the only taxed dimensions being length on water-line and sail-area. This change, though at once affecting dimensions, did not materially affect form, though even in the earlier boats designed under this rule more hollow was given to the sections, this being of course a necessity, as with the added beam abnormal displacement would otherwise have been the result. But displacement was not immediately cut down, and for a given length of load-water-line yachts had quite as much displacement as formerly; 'Thistle,' 120-rating, and 'Mohawk,' 40-rater, the only two large yachts built the first year for the new classification, both being wholesome big-bodied boats, with 130 and 58 tons displacement respectively. Overhang naturally increased somewhat, as it was apparent that this could be more usefully adopted with a shallow-bodied boat than with a narrow one, it being evident that the natural way of forming the stem and counter was to follow the general buttock lines of the fore and after body. This overhang on the fairly deep boats built up till 1890, so far from being objectionable, was a distinct advantage, as it gave a fine, easy, and at the same time lifting, bow in a sea, eased the bow riband lines when the boat lay down and was hard driven reaching, and carried the side fairly out aft in the long counter.
Profile of lines of 'Meteor' (late 'Thistle'). Designed by G. L. Watson, 1887.
