I am looking for information on a roller furling main that is not captive within the boom or mast. It looks like a roller headsail that has been adapted to a main.It is on a Cat.250. Can it perform?..without excess chafing? It is attached at the masthead and at the foot of the boom.
With all due respect to Gui's opinion, the type of system you are describing can be a practical solution for a lot of people who are looking for the convenience of a main furler and don't have the money to purchase a new furling mast, boom or retrofit system.
With some modifications to the goose neck, a few custom made parts for the mast head, some work on the boom, a system can be rigged for not much more than the cost of rigging a new headsail furler.
You most certainly will sacrifice performance. But many people find that a price they are willing to pay.
We're not all racers.