New main Radial or tape drive...?
The Radial design seems better suited for a loose footed set-up. You can set a great profile with a loose footed sail and the radial design would seem to maximize it''s benefits.
As a matter of fact, if you are looking for a hot shape in a mainsail for racing, loose footed is almost always the way to go. Of course once you reef, it''s advantages are lost. Up ''til then, you can set a wonderful shape loose footed.
I would also think that the radial design might be less effective if you will have your foot attached. Then you would want a more traditional "shelf" designed foot.
But I''m not a sailmaker, and they ALWAYS seem to have the answers...lol.