A number of armament configurations were considered including six. The production aircraft was intended to have a pressurized cockpit, an innovation at the time. The Model IIa was designated as the XP-67.
Spylab pursuit plus#
On 30 September 1941, the USAAF granted McDonnell a $1,508,596 contract, plus an $86,315 fee, for two prototypes, a wind tunnel model, and associated engineering data. McDonnell designers promised that the design would deliver a top speed of 472 mph (760 km/h) with a gross weight of 18,600 lb (8,440 kg), although the anticipated gross weight was soon increased to a somewhat more realistic 20,000 lb (9,070 kg). The design used laminar airfoil sections throughout. However, the design was still quite ambitious the design team tried to maintain a true airfoil section through the center fuselage, merge the rear portions of the engine nacelles with the wing, and radically fillet all edges of the fuselage and nacelles into the wings in an effort to reduce drag. The new design was powered by a more traditional layout, a pair of engines in wing-mounted nacelles with four-bladed propellers in a tractor configuration. McDonnell engineers returned on 30 June 1940 with the Model II, which was also rejected, so it was reworked into the Model IIa, which emerged on 24 April 1941. Despite the apparent setback, Air Corps leaders were impressed by the nascent company's efforts, and granted McDonnell a $3,000 contract to re-engineer the aircraft. The proposals that were accepted included the similarly ill-fated XP-54, XP-55, and XP-56. The Model I fell in 21st place when the 23 proposals were examined and scored. However, 22 other manufacturers also issued proposals to meet the Army's request the McDonnell proposal had relatively unimpressive anticipated performance, and its odd drivetrain was unproven. The aerospace parts manufacturer McDonnell Aircraft, eager to begin manufacturing its own aircraft, responded to the proposal with drawings and specifications of the proposed Model I, which would be powered by an unusual geared drivetrain with a single Allison V-3420 engine buried in the fuselage powering twin wing-mounted pusher propellers in the wings. The specifications were very bold, encouraging manufacturers to produce radical aircraft that would outperform any existing fighter in the world at the time. Army Air Corps issued Request for Proposal R-40C, requesting designs for a high-speed, long-range, high-altitude interceptor intended to destroy enemy bombers. ( February 2017) ( Learn how and when to remove this template message)
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