Some things to look for on the Tartan. Ports are very sturdy, but are a bit more prone to leakage than average. Stains on interior woodwork is the usual clue. For some reason chainplates on one side are more prone to leaks than the other. I forget if it is the port or starboard, but both are quite visible from the interior. Unless the shaft has been extended the prop is right behind the keel, with the only zinc on the boat on the shaft hub. This is ok, but make sure it is intact. The mast foot is low in the bilge and is prone to corrosion. This is true of other boats as well, but I know one tartan 30 owner who had the foot collapse under sail. He was able to fix it without a new mast. The keel is lead, the skeg mounted rudder has a shoe at the bottom, the rig is overbuilt and the hull is thick solid glass making these boats very sturdy and a good purchase option despite their age. As always proper upkeep is the key.
The boats sail better than average for that era and were available in a standard or tall rig. Under power they are ok, but reverse can be a challange with the prop location almost mid-ship and the skeg hung rudder not being very efficient while backing. The interior had two plans, One with an aft galley, one with a full length starboard galley. Both are workable for 2 people.