NACA research memorandum RM (series). L57L13. Tests of aerodynamically heated multiweb wing structures in free jet at Mach number 2: 4 aluminum-alloy models of 20-inoh chord and span with 0.004-inch-thick skin, 0.025-inch-thick ribs and webs, and zero, 1, 2, or 3 chordwise ribs [with list of references]: by John R. Davidson, Richard Rosecrans, and Louis F. Vosteen.