high octane fuels
fuel injection
water injection
liquid cooled engines
air cooled engines
supercharger (ENG)
cantilever wings
shortened wings
stiffened wings
gull wings
reinforced wing braces
low drag wings
heavier airframe
large rudders and flaps
variable dihedral
oversized propellers
variable pitch propellers
streamlined fuselage
expanded cockpit (medium plane)
pressurized cockpit (large plane)
bubble canopy (light medium plane)
armored cockpit
remote gun turrets
cluster bombs (cas)
reinforced wing hardpoints



