The club is closely, but not exclusively, associated with the Shannon-One-Design (SOD), a single-sail class of open clinker built boat designed for a crew of two. Subsequently, it was considered desirable to bring a third person along, and this has now become the class rule. The SOD was modelled on a traditional 18'-0" lake boat. The SOD was designed by Morgan Giles of Teignmouth. It was introduced to the Club in 1922 in response to a growing demand for a one-design competitive and less expensive dinghy. Over a hundred and forty have now been built for the Shannon Lakes. Some of the original fleet still continues to race. Sail numbers started at No. 32.