Propeller Eye[1] is an enemy appearing in Mega Man 6. It is a small, tube-shaped robot with a singular camera "eye" and a shell that can open and close, with a propeller attached to the top.
While its shell is closed, it is impervious to most damage, effectively making it only vulnerable while moving; however, a fully charged attack from Power Mega Man can destroy it regardless and will do so instantly.
An improved version of Pukapelly. It now flies around with a propeller. Its flight speed is low, but it can only be damaged when its camera is exposed.
HP 03
AT 03
Related Enemies
According to its Database description, Propeller Eye is based on the Pukapelly, which it shares a similar design and behaviour with.
Pukapelly (Mega Man 5) - Moves in a similar manner, but its shell does not protect it from attacks.
References
↑Mega Man: Official Complete Works art book, 2009.