The proprietor of Hang Fire Books scanned the plans for these two cool model airplanes out of some old issues of American Aircraft Modeler.
First this plan for a Flying Witch's Broom by Frank Scott (American Aircraft Modeler, Nov 1972)Link
Next this spiraling, single-wing craft named "Charybdis" by designer Charles W. McCutcheon (American Aircraft Modeler, Oct 1972)