|There is a Mk3 in Melbourne with an IS. |
It has been converted with a bow sprit to use the IS.
I chose not to buy the boat because the loads imposed by the new rig were probably 2-3 times what god designed for the hull and deck.
The simplicity of the IS and obvious advantages are atractive but I think it would need to be on a new hull and rig designed, manufactured and optimised for racing. A big shift from the solid foundations of the RL24.
Why do people take something that was designed and made right and want to change it in the name of progress. Leave the existing RLs as they are and make a Mk5 with the IS if you must, or buy one of the many unwanted racers on the market and keep the RL24 intact as an excellent cruiser/handicap racer.