The Star 45 R/C Model Sail Boat - Builders Journal
"Dave Mainwaring"
Someone asked about shapes and sizes.
I like keels that resemble in some manner the "Scheel Keel". Flat bottoms help fight heeling. My version was based on my sailing in waters with lilies and pond grass that snagged torpedo shaped bulbs. I liked being able to back away and have the crap slide off the keel.
http://photos1.blogger.com/blogger/5587/620/400/Sirius%2045%2006.jpg
http://photos1.blogger.com/blogger/5587/620/400/Sirius%2045%2002.jpg
Here is a photo of the original Mainwaring Keel and Mainwaring Bulb
http://photos1.blogger.com/x/blogger/5587/620/400/353321/Sirius45Keel.jpg