BlueBird PR22B5FA 22" Flail Power Rake with 5.5 HP Briggs Engine. BlueBird PR22B5FA 22" Flail Power Rake with 5.5 HP Briggs Engine. The PR22 operates as a power rake, seeder, or power rake with a rear catcher bag to collect thatch. The modular design provides the option of changing reels quickly and easily. Units are available with or without a reel assembly. Combining the base platform with any reel and/or kit (seeder or bagger) offers versatility for every application. The PR22 with a bagger makes dethatching and clean-up simple and efficient. The 5-bushel bag is quickly removed and emptied.