Sensenich Fixed-Pitch Propeller Nomenclature and Repitching

sensenich-propeller-verticalSensenich aluminum fixed-pitch propeller model designation system


  • _  Special letter prefix to identify accessories or composition of propeller. Current letters include ‘S’ for STC package and ‘W’ for wooden propeller.
  • 70 Basic diameter in inches
  • C Designates Blade Design
  • M6 Designates hub configuration…”M6″ for installation on SAE No.2 (Ref. AS 127) flanged shaft with 6/16 (3/8) dia. bolts. “M7″…for installation on SAE No. 2 (Ref. AS 127) flanged shaft with 7/16 dia. bolts.
  • S16 Designates a 16/4 or 4 inch spacer (extension) thickness.
  • -0- Designated cut-off in inches from basic diameter.
  • 79 Pitch in inches at .75 radius station.
  • _ Designates design change


Q: What is the maximum amount of repitching that can be done to the 76EM8xxx and 74DMxxx props?


For example, can a 76EM8-0-62 be repitched to 66″?
How many times can repitching be performed?

A: We have Service Memo #86-1.

You can repitch a Sensenich propeller a total of 8 inches from the propeller’s median pitch. In the case of the 76E and 74D series props, both propellers have a 60″ median.

Therefore, in the example above, the 62 has already gone up 2 inches. You can still go up 4 more to the 66 for a total of 6 inches. Then you can go back down to a 64 and that would be your total of 8.

For more information about model-specific Sensenich propellers see this article.

(Information compiled from the Sensenich website and Ed Zercher, Sensenich General Manager)

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Omar Filipovic
Omar Filipovic is president of the Glasair Aircraft Owners Association as well as the chief tinkerer and content editor for this website. He is also the web editor for Kitplanes Magazine. Omar is building a GlaStar in Portland, Oregon.