No full keel on the 26
The O'DAY 26 was never offered with a "full-Keel", only the K/CB and possibly a fin-keel. The draft for the K/CB was 2'6" cb up, 6' cb down. The Fin keel draft was 4'6" the same as the fin-keel (aka: deep-keel) 25. The 26 was built in 1984 and 1985, before being replaced by the 272 for the 1986 model year.
O'DAY never built any Full-Keel boats, only centerboard, Keel/Centerboard, and Fin-Keel designs. A Full-Keel would be like those on a Cape Dory, or other old Carl Alberg Designs, others include the Sea Sprite 23, 27/28, 30, and 34, the Pearson Triton, Electra/Ensign, Ariel/Commander, and the Bristol/Sailstar Corinthian. Full-Keels usually have the rudder attached to the trailing edge of the keel and the keel usually extends most of the length of the below waterline part of the hull.