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At the Broads Radio Yacht Club there are currently three classes of boat for which races are regularly organised:
 
INTERNATIONAL ONE METRE CLASS
As indicated in its title this is an internationally recognised class of radio controlled yacht and enjoys well supported and highly competitive World and European Championships. The class rules are controlled by the International One Metre – International Class Association (IOMICA). Since its inception in the late 1980’s this class has developed into the most popular, perhaps partly because the class rule is ‘closed’ with many aspects of design, materials and construction restricted to help produce close racing and keep down costs. The boats are easily transported having an overall length of one metre and are allowed only three rigs which utilise one-design sail plans. The boat has a minimum weight restriction and there are maximum and minimum restrictions for the draft and the weight of the fin and bulb.
RADIO MARBLEHEAD CLASS
This is another internationally recognised class which enjoys international championship events. It has been in existence since the early 1930’s when it was devised by Roy Clough of the Marblehead Model Yacht Club in the USA. Roy wanted a simple formula to produce a large boat that could nevertheless be easily transported. It is understood that he measured the width of the back seat of his car, which was 50 inches (1290mm), and this became the maximum length allowed for the boat. He decided on a maximum sail area of 800 square inches (0.5161 square metres). Within these simple parameters there was great freedom of design and construction and as more modern materials such as glass reinforced plastic and then carbon fibre became available boats became lighter and narrower with longer fins, and much faster.
Most post 1991 designs remain fully competitive and the maximum draft is now set at 700mm. The Marblehead class is often referred to as the ‘Formula One’ of radio sailing and both swing and conventional rigs can be used.
RADIO SIX METRE CLASS
This MYA national class is a scaled down version of the full sized boat and is elegant and graceful on the water. It is a displacement boat and doesn’t have the long fins of the IOM and RM class boats, relying on the shape of its hull, as well as the ballast weight, for its stability; it therefore provides a somewhat different, interesting and challenging sailing experience. The class rules are open which allows considerable design variation and development within the measurement formula and boats constructed from wood as well as the more modern glass or carbon reinforced plastic remain competitive, as do older designs which is encouraging for those who enjoy home building. This together with the need for only one mast, a main boom and a jib boom together with one suit of sails and perhaps a smaller ‘skinny’ mainsail for heavy weather, helps make this an ideal class of boat for the more cost conscious among us. The BRYC very successfully hosted the Radio Six Metre National Championships in 2007 and 2008 and both events were great fun for all those involved.
MICRO MAGIC
Whilst not part of our formal race programme there is now a good sized fleet of these small, radio controlled yachts at our club. This popular class world wide is a commercially produced model, which is available in kit form or ready made and the design is based on the full size Atlantic Transat yachts. In spite of its small size the Micro Magic has excellent performance and makes a fun alternative to the well established larger boats that we sail.
RADIO ‘A’ CLASS.
This ISAF RSD international ‘open’ class was added to our formal race programme in 2010. If the Radio Marblehead class can be considered as the ‘Formula 1’ of radio sailing then the ‘A’ class should be viewed as the ‘Luxury, high performance, sports car’. These boats are not limited in length – usually measuring two metres or so – and are controlled by a rating formula which balances waterline length, displacement (weight) and sail area. This means that sails get smaller as displacement gets less and as waterline length increases. This formula gives great flexibility of design and ensures that all boats are competitive with one another, no matter what their precise dimensions may be. The rating formula was devised in 1922 by the editor of Yachting Monthly as a testing ground for later use in the full sized 5.5 Metre class rule. These are very large boats and a fleet of them on the water is a very impressive sight.
 
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