I like the AMA Racer over the Delta Dart. That is the way SIG refers to them now, I believe. The AMA Racer was originally presented in American Aircraft Modeler as the Delta Dart, I think. It has a longer, higher aspect ration wing. I advise people to make several copies of the plan/covering material so they can scratch build new ones with thinner, lighter wood and tissue covering. A stock one built per instructions will do in the 30 second plus range indoors with rubber like Norm suggests. A lighter scratch built version will get into the magic minute range. It's quite thrilling to see your rubber model circling slowly and beating the clock to that one minute mark! There are lots of parlor mite model plans out there on the internet and they are great for flying in your living room or great room. It's another challenge to try and beat a minute in your own living room, but it is possible with practice. Bill Hannan did one called the Escondido Mosquito that was in the For the Tenderfoot series in American Aircraft Modeler also in the mid 1960's. Not much money in materials involved and not much money for tools and equipment. Just need a good wood stripper, a rubber stripper, a couple of good winders and you have the basis of what it takes to fly indoor.
Type at you later,
Dan McEntee