"Frank Boettcher" wrote in message
...
If a sail is listed as Mylar/Kevlar is it a composite of both
materials?

Yes. Usually Dacron with a mylar sheet laminated to it for the panels.
Kevlar tapes are sewn along the stress areas.

Can a sail of that type be converted from hank on to roller furling?

I don't see why not. Mylar/Kevlar sails are made with luff tapes to fit in
a foil on the headstay. Why would you bother, though? A Mylar/Kevlar sail
is cut for performance with a roach for the prevailing wind conditions.
Roller sails have to be cut much flatter.

Is it a cost effective conversion?

Probably not. Why ruin a good sail?

Frank