ripping-panel

A Dictionary of Aviation · 1911 · p. 22

‘zip in,pent n. a panel or strip of balloon cloth in the upper part of the gasbag of a balloon which, by manipulating the rrpprng-cerd, may be suddenly ript or or rent, so as to allow the inflating-gas to escape and the balloon to descend; the ripprng-strrp; a rip-stzrp.