×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Old wooden propeller

Old wooden propeller

Old wooden propeller

(OP)
I have to look after a large 44-year-old propeller, does anyone out there know of reference material or historical data detailing effects of age on material strength or fatigue resistance

RE: Old wooden propeller

Basic approval confirms that the propeller meets certain strength and durability criteria. The following chart lists the FAR 35 requirements that must be met in order for a propeller to be type certified:

Must have installation, operation, and maintenance manuals.
Must be constructed from approved materials.
Must have all operating limits defined.
Must be able to withstand a 41% overspeed (twice the rated centrifugal force) without failing.
Fatigue tests of the hub and blades must be conducted.
Must pass an endurance test while installed on an engine.
Functional testing requires operation of over 1,500 pitch change cycles.
Durability testing must be conducted for 1,000 hours of operation.

Special conditions may be assigned. For composite blades, bird strike and lightning strike tests are generally required before the propeller is certified.

see:
http://www2.faa.gov/certification/aircraft/

propeller links
and
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/CurrentFARPart/CD9A9FF131A2DE8E852565B1006120CC?OpenDocument

RE: Old wooden propeller

(OP)
Thanks boo1.
This prop is  VERY LARGE and fifty years old, I was hoping that someone could point me in the direction of fatigue data for laminate mohogany, if there has been any tests carried out with referance to age effect.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources