A retractable nosewheel undercarriage was to be fitted. It had a fixed tailwheel undercarriage. He chose a modern cantilever monoplane with enclosed cockpit, retractable undercarriage and flaps. It had a retractable undercarriage and non-retracting tailwheel. The Z.1007 was a mid-winged monoplane with a retractable tailwheel undercarriage. It was provided with a retractable undercarriage and tailwheel. The MiG-1 was a low-wing monoplane with a tailwheel undercarriage of mixed construction. All Vikings featured a tailwheel undercarriage. The Model D was a biplane fitted with a wheeled tricycle undercarriage. It had tandem open cockpits and a fixed main undercarriage plus a tailskid. It was also equipped with a tricycle undercarriage arrangement. It was of all-metal construction with a retractable tricycle undercarriage and tandem seating. It was also the first fighter fitted with a tricycle undercarriage. The Mosquito had a low stalling speed of with undercarriage and flaps raised. The tricycle undercarriage is non-retractable.