The subject of a patent applied for by Martin in 1935 and granted the following year. The patent does not specify the mechanism to activate the pylon other than to say that 'means is however provided to raise them to an operative position when the machine is alighting"Random question...per the old Martin-Baker MB-2 web site and other sources, the MB-2 had an automatic rollover pylon: "A crash post was fitted, which automatically extended to minimise structure damage and injury to the pilot in the event of a nose-over landing." Here's a pic with the post extended (source).
I think a few other 1920s-1930s designs had automatic rollover protection, but does anyone know how such a system actually worked in practice? Was it just a weighted tube within another tube that extended and locked when subjected to negative G? Was it controlled manually by the pilot in some way? Maybe tied in to the flaps?
Thanks and regards,