An aerobatic airplane has either a fixed-pitch or constant-speed propeller. The pitch of the blades is the angle at which they “bite” into the air. On airplanes with a fixed-pitch propeller ...

The significant upgrades were the fuel-injected Continental IO-360K 195 hp (derated from 210 hp) engine and a two-bladed Hartzell constant-speed propeller. The Hawk XP entered production in 1977 ...