cove and bead router bit

I'm building a Shearwater 16 and would like to mill some strips in addition to those included in the kit.  Does anyone know what the correct radius of the cove and bead bit should be?  My guess is a 3/16" radius but I'm not sure.

Thanks for any advise you can give me.

The standard bead and cove set for strip building is 1/4" radius.

http://www.leevalley.com/US/wood/page.aspx?cat=1,46168,46174&p=30155

 

 

Stacked Flute and Bead Router Bits

http://www.mlcswoodworking.com/orderstatus/html/smarthtml/pages/bt_flute.html