- Lateral control would be through the use of "retractable ailerons" (circular arc spoilers) along with short span conventional ailerons.
- Landing flaps will be slotted type extending from the fuselage to approximately 80% of the span of the wing. Whereas the fixed hinge flaps on the F4U-4/-5 only covered 55% of the wing span.
- Armament would be 4 20mm guns with 200 rounds of ammunition. Also eight Mark 9 rocket pylons and two center section bomb or fuel carrying pylons. A centerline pylon completes the external stores provisions.
- Wing folding would be improved to allow operation in winds up to 55 knots.
- Main landing gear would be similar geometry but extensive redesign to fit the low drag wing airfoil. The main tires would change to 30 x 7.7 10-ply high pressure tires instead of the 32 x 8 tires of the F4U-4.
- Due to angle changes the wing to fuselage joint would be reworked.
- Some strengthening to the aft section and stabilizers would be necessary.
Expected Performance Improvement
- The maximum speed at combat power in clean fighter configuration compared to the F4U-5 would be 16 mph at the combat power critical altitude.
- The maximum speed difference at sea level would only be 7 mph.
- Stalling speed reduction of 1.3 mph than a standard F4U-5 with the flaps down.
- Stalling speed increase of 3 to 4 mph with the flaps up over a standard F4U-5.
- The angle of bank in the first second and rate of roll is estimated to be as much as a 10% increase at 300 mph over the standard F4U-5.
Four things led to the increased speed estimates:
- Higher critical mach number due to the change in airfoil from NACA 230 series to a NACA 64 series.
- Improvement in critical mach number for the wing inlet duct
- Reduction in drag and surface roughness due to the use of Metalite wherever practical
- Elimination of wing flap external hinges.
Previous posts in this series:
Low Drag Wing Study Part 1
Low Drag Wing Study Part 2