Limit loading and wing frequency tests of the composite VUK-T sailplanes

Abstract

A test program aimed for the limit loading and frequency characteristics testing of the wings of the first all-composite sailplane, VUK-T, designed in Yugoslavia was presented. The verification test implied combined frequency-static-frequency testing. The wings were mounted on a special ground-fixed rigid mount in inverted position, at an incidence that simulated the actual angle of attack at which maximum wing loading was achieved in flight. The ground testing procedure proved to be reliable and efficient in determining the capability of the wings to withstand the limit loading without consequences for the structure.