This from Sky & Telescope:

DWB 111, also known as the Propeller Nebula is a hydrogen-alpha emission nebula in Cygnus.
The propeller shape is actually a small portion of a much larger emission nebula, which can be seen as faint hydrogen-alpha nebulosity
throughout the image frame. The distance to the nebula is not known.
-------------------------------Camera: Moravian Instruments G4 (16803 chip) w Astrodon Gen II H-Alpha
Scope: Astro-Physics AP155EDF w 4" FF and Focus Boss II focuser motor
Mount: Paramount MX guided with an SBIG ST-402ME and Borg 60mm achromat riding piggyback
Exposure:
H-Alpha: 21x20min
RGB: 6/7/8 x 10min
Acquired with TSX and CCD-Commander
Calibration and processing in PixInsight. Additional tweaks in PS CC

Lucknow, Ontario
June 2020