 A conventional fixed undercarriage was used; it had been deemed of greater importance to reduce the aircraft's weight than its drag, thus a retractable undercarriage was seen as counterproductive.The wings, which were constructed in three sections, had a centre section integral with the fuselage; the internal structure used three main spars with plywood webs and mahogany flanges, which were covered with plywood sheeting.In order to cope with the extreme altitudes flown at, the pilot was provided with a specially-developed two-piece suit.