Since you asked about FM, I assume you will be machine quilting on a domestic machine? I've done FM Baptist fans on a domestic machine by marking the quilt top before I pin baste the sandwich using a stencil and washable markers, then free motion quilt it with a darning foot. I like to have my feed dogs disengaged for FM quilting.
Stencils are available from The Stencil Company, but they call it Bishop's Fan
http://quiltingstencils.com/search.aspx?find=fan
Others are available from J D Stencils
http://www.jdstencils.com/stencil_website_8-31-2010_014.htm
You can watch this video from Off The Edge (a long arm template supply company) to figure out how to stitch in a continuous line. Of course, manipulating a quilt through a domestic machine will be different, but you can see the sequence here:
http://www.youtube.com/watch?v=oD5QrFG1YiY
Baptist fan was is popular design by hand quilters because the arcs can be easily "eye-balled" and quilted with no marking by keeping the lines of stitching approximately a needle's length apart.