The Tartan 34C did come with several diferent boom lenghts, but the short answer to your question is yes. My 34C Yawl has the same boom length as Roberts "Tartan 34C", 34C sloop. I don't know if the yawl was an experiment that was tried when they made the decision to shorten the boom, there weren't very many factory yawls (less than 5%)
I have to think there are other examples out there of a sloop/yawl option with the same main mast sail plan, especially of that era.
Last edited by T34C; 01-01-2007 at 08:56 PM.