Catalyst Journal of the Amateur Yacht Research Society Volume 1, No. 3 January, 2001 Features The AYRS-John Hogg Memorial Prize Structures On the Design of Long Thin Surface Piercing Hulls Robert Downhill Ferro Cement Report R Michael Ellison Performance Maxed Out with Five Masts Richard Boehmer Power Alternating Sailing Peter A Sharp Multihull Yacht Performance Prediction Joseph Norwood Jr Design Practical Proas Joseph Norwood Jr Hull Shape Tom Speer Sailrocket Malcolm Barnsley Fid Physics or Phyd Fisics Frank Bailey On the Cover Team Philips sails back to port after losing the front half of her port hull. Photo: Rick Tomlinson JANUARY 2001 1 Catalyst Journal of the Amateur Yacht Research Society Editorial Team— Simon Fishwick Tom Blevins Dave Culp Sheila Fishwick Specialist Correspondents Aerodynamics—Tom Speer Electronics—David Jolly Human & Solar Power—Theo Schmidt Hydrofoils—George Chapman Instrumentation—Joddy Chapman Iceboats & Landyachts—Bob Dill Kites—Dave Culp Multihulls—Dick Newick Speed Trials—Bob Downhill Steam Power—Lord Strathcona Structures—Keith Burgess Windmills & Turbines—Jim Wilkinson Catalyst is a quarterly journal of yacht research, design, and technology published by the Amateur Yacht Research Society, (Regd Office 9 Lynton Road, Thorpe Bay , Essex SS13BE, UK) Opinions expressed are the author’s, and not those of AYRS. AYRS also publishes related booklets. Contributions are welcome from all. Email them to [email protected], or send (at your risk) disks or typed copy with illustrations to the Society’s office. AYRS can take no responsibility for loss or damage. AYRS members receive both Catalyst and the booklets. Subscription is UK£20 or US$30 per annum for a Full Member, £10 or $15 for students and retired members. Send subs- cription requests and all other queries to the AYRS Office, BCM AYRS, London WC1N 3XX UK, phone +44 1727 862268 or email: [email protected] AYRS is an UK Registered Educational Charity No 234081 for the furthering of yacht science. Website: http://www.ayrs.org © 2000 Amateur Yacht Research Society BCM AYRS, London WC1N 3XX, UK All Rights Reserved ISSN 1469-6754 2 CATALYST News and Views Sir Reginald Bennett VRD, 22 July 1911 19 December 2000, past-Chairman of AYRS Sir Reginald Bennett was best known to the general public as a British Member of Parliament, and the man who as Chairman of its Catering Sub-Committee filled its cellars with fine wines, but to the yachting world he is better known as firstly Chairman of AYRS and then of the WSSRC. He was born in July of 1911, He learned to fly before the of Edinburgh, and persuaded in Sheffield, England, the son war, and gained his wings with him to become our President. of a civil servant. He won a the British Fleet Air Arm in In 1980, he succeeded Beecher scholarship to Winchester 1941, serving as a flying Moore as Chairman of the RYA School, where he started the medical officer with the rank Speed Sailing Committee, and school sailing club, and another of Surgeon Lieutenant- when that body was to Oxford University where he Commander (RNVR). He was transformed into the World read physiology. He then torpedoed twice, and awarded Speed Sailing records continued his studies in the Voluntary Reserve Committee, became its first London first in medicine then Decoration in 1944. Chairman, continuing until specialising in psychiatry. shortly before his death. Under He was elected Member of his patient leadership, the He had always had a love of Parliament for Gosport & WSSRC has become yachting. At Oxford, he sailed Fareham in 1950, remained so universally recognised as the for the University from 1931 until his retirement in 1979. A authoritative body for the to 1934, and in 1934-5 was master of fine wines, he won a supervision and ratification of helmsman and navigator on number of wine-tasting records under sail. the J-Class Shamrock V, racing competitions, and claimed against the Americans for Sir after his retirement to have He is survived by his wife, Richard Fairey. In 1936, he made the best use of the four children and was reserve for the British Parliament cellars since Guy grandchildren, to whom AYRS Olympic yachting team at Keil, Fawkes filled then with extends sincere condolences. and later raced in the 12 Metre gunpowder in an attempt to yacht Evaine. He was founder blow up the building (and the of the Imperial Poona Yacht members) in 1605! Club, an institution which despite its name is peculiarly Reggie Bennett became British, devoted to the lighter Chairman of the AYRS in and enjoyable things of life. 1972, succeeding Sir Peregrine For example, each year it Henniker-Heaton, and served challenges the Oxford until 1990. During his time University Sailing Club to a he built up a strong support for backwards-sailing race on the the Society. He was a yachting River Thames! friend of Prince Philip, Duke JANUARY 2001 3 News and Views John Hogg, 19th March 1915 - 24th July 2000 The AYRS’s longstanding housekeeper, secretary, she was member John Hogg died on 24th always the supporting audience July 2000 at the age of 85. that he needed. So when the time John was born soon after the came, and illness forced her to start of the Great War on March slow down, he relished the 19th 1915 in the seaside village of opportunity to care for her for as Sketty, near Swansea, close to the long as he was able. home of his mother’s talented It was from the strength of their Cavill family. life together in Curdridge that After the Armistice his father John so enjoyed being able to returned to the iron and steel combine his fascination with industry and the family moved researching, measuring and north.Although the family suffered making things with his abiding much from the effects of the love for the village and its people. Depression on employment in I met him in 1947 shortly after steel making, John received an he had helped form the Radio excellent education at the Controlled Models Society. Those Manchester Grammar School. Working with good friends were the days of one-valve receivers This led him into his lifetime [George Chapman and others], his working a sensitive relay which in management career with the Gas papers on performance measurement turn controlled electro-mechanical Industry as a chartered engineer. provided an important practical devices, in which he employed In the early 1950s, John had contribution to the creation of the much ingenuity. He was on to moved South to manage the newly Amateur Yacht Research Society transistors as soon as they came on nationalised Southern Gas Board and its influence on fast yacht the market, and led their use. in Bournemouth and, of course, to design. Equally, and for the AYRS more mess about in boats of every In 1960, when his job moved to important, he was a leader in description. By this time he was Southampton, the family moved sailing boat performance already a radio control pioneer, to Curdridge. It was here that John measurement, using pocket-money developing most of the radio and and Ena settled happily in the year budgets and largely home-made electromechanical systems for a leading up to his retirement. Only equipment. Looking back it is succession of model yachts which then was he persuaded to buy an remarkable that he was involved he raced successfully in Poole. extremely small yacht of his own. with America’s Cup challengers, This led inevitably to his work Moored on the Hamble, the but times have changed ! Even on yacht research, testing scale ‘Emily Rose’ was frequently trailed when ‘affordable’ yacht performance models of America’s Cup challengers to St Mawes for their annual instruments came on the market Sceptre, and Kurrewa and designing holiday and on it he enjoyed many in the late 1950s, the cost of a full and building new ways of measuring happy summers with his grand outfit equalled what he (or I) was sailing performance at full size. As children, Derek Mallinson and prepared to spend on the boat. well as providing endless fun on other Curdridge friends. This is still largely true, but then it other people’s boats, he found this In 1970, sailing had started to is difficult to compete financially a perfect outlet for his become an industry, and John’s with sponsored professionals. extraordinary inventive skills. son Rodney was able to apply Only in very recent years has the Soon he was creating some of this home background price of dinghy-scale equipment microelectronic forerunners of when he joined the small business started to come down. today’s instruments for measuring that has developed into rope- His writings in AYRS publications wind and water speed, aerofoil holding equipment specialists, rank with those of, for example, shape, boat speed to windward Spinlock Ltd. Cowes. Edmond Bruce and Harry Morss, (Vmg), and countless other John was the first to acknowledge and are a lasting memorial. gadgets which his embarrassed that his rich and varied life was He was a good friend who will children would be expected to test only made possible by Ena’s be sorely missed. on roads and various other public endless patience and devotion. As places. wife, mother, crew, cook, — G.C.Chapman 4 CATALYST News and Views Winds of Change: A Rally for innovative water craft We had great weather for our first "Winds of Change" Rally which took place on August 18th– 20th, at the Royal Harwich Yacht Club, on the estuary of the Ricver Orwell in Essex, E. England. We had a good uptake in some to be a breach of the Laws of Saturday people attending, in fact 31of us Thermodynamics) but proved in Philip Middleton with “Triton partook of the dinner and the fact that this certainly is not Chariot”, a 20' foiled trimaran social evening on Saturday evening bogus.