Welcome Guest. Sign in or Signup

2 Answers

Propeller blade angle 172RG

Asked by: 3823 views ,
Flight Instructor, Private Pilot, Student Pilot

Why is the propeller blade angle in the 172RG measured at the 30 inch station? I see it mentioned under the power plant limitations in the POH. Isn't blade angle measured at a specific point along the length of the blade?

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

2 Answers



  1. Russ Roslewski on Aug 07, 2014

    I’m not sure I understand your question – as you say in your second question, since the blade angle of a propeller changes with distance from the hub, they have to pick somewhere to measure it for reference. In the case of the 172RG, they are measuring it at the “30-inch station”, which means 30 inches out from the beginning of the blade (or the center of the hub – I’m not exactly sure, but that’s the idea).

    Or is your question “why 30 inches and not 28 inches or 33 inches or some other number”?

    -1 Votes Thumb up 0 Votes Thumb down 1 Votes



  2. psequeira on Aug 10, 2014

    All clear now. Could not figure earlier from where exactly was the measurement taken. Thank you Russ!

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.