a few months ago i bought the peices of a 1979 NACRA 18 SQ. I now have a working boat. kinda. I know i'll have several questions. one thing at a time.

rudder foil/blade. the boat didn't have them. I now have aquired two sets. one set has a much larger/thicker chord.

what are the correct foils for the boat? what are the differences? which ones are better? etc?