Yellow strips on Hartzell Props
 

Hi,

Any idea about the purpose of those yellow stripes on the prop back side?
Maybe a visual indication for prop pitch. Visible yellow arc = prop in normal pitch angle. Yellow arc not visible = Prop feathered.

http://blog.trade-a-plane.com/wp-con...ell-Prop-3.jpg

Cheers.

Just a wild guess....

Reference Blade Radius ... refers to the propeller reference blade radius in an assembled propeller; e.g., 30-inch radius. A measurement from the propeller hub centerline to a point on a blade, used for blade angle measurement in an assembled propeller. A yellow adhesive stripe (blade angle reference tape CM160) is usually located at the reference blade radius location. (Note: do not confuse reference blade radius with blade station; they may not originate at the same point


From Hartzell STANDARD PRACTICES MANUAL 202A VOLUME 7

Very useful on the Tucano. In flight they appeared as a yellow ring in front of the pilot at almost exactly 5 degrees off the nose - which was useful for navigation.