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  1. johnSchwaner

    Shear Strength of Stainless Steel

    I believe NASA's Fastener Design Manual shows: Alloy and carbon steels ultimate shear stress = 0.6 Ftu Stainless steels ultimate shear stress = 0.55 Ftu
  2. johnSchwaner

    Anodizing aluminium reduces fatigue strength. what about climbing hook?

    their more pretty when colored Protection from corrosion, which also reduces fatigue strength -- as long as there are no scratches through the anodizing!
  3. johnSchwaner

    Standard torque

    Your concern is valid since it agrees with Bickford when he states: "Knowing the strength of the bolt alone is not sufficient, since it's never used alone." "An Introduction to the Design and Behavior of Bolted Joints" Preload should be based upon calculated joint requirements and not a general...
  4. johnSchwaner

    Why Not Fuel Injected GA Aircraft

    I had a carburetor ice detector installed in the late 1970's and flew several thousand hours with it and it worked; so the technology has existed for a long time. Tried to sell them without success. An old adage in the aircraft parts industry: "safety doesn't sell"
  5. johnSchwaner

    Why Not Fuel Injected GA Aircraft

    Economics Both fuel injection and carburetors have existed in the GA marketplace for as long as I have been in it - early 1970's. More expensive airplanes are generally fuel injected and less expensive airplanes are carbureted. Back in the 1980's we would remove the carburetor from Lycoming...
  6. johnSchwaner

    rivets

    Yes
  7. johnSchwaner

    rivets

    My first star - thank you
  8. johnSchwaner

    rivets

    Try MIL-R-47196 "Rivets, Buck Type, Preparation and Installation Of" Table II Here is a link to a copy on my web site: http://www.mechanicsupport.com/manuals/mil-r-47196A.pdf http://www.mechanicsupport.com/manuals/mil-r-47196A.pdf
  9. johnSchwaner

    part feature vocabulary

    I've been working on a photo glossary of descriptive terms. In repair manuals these descriptive terms are used. Sometimes no one but the author knows what in heck they are talking about: my examples: cheek - as in "crankshaft cheek" land - as in piston land shank journal port
  10. johnSchwaner

    Guides on Aircraft Electrical Wire Material and Insulation Types

    Try this link. It has some good history on wire insulation and wire conductor coatings. http://www.tsb.gc.ca/eng/rapports-reports/aviation/1998/a98h0003/01report/01factual/rep1_06_10.asp
  11. johnSchwaner

    Hoses

    The short answer is yes, 9 years is within the age control limits for the installer/end user. My previous post was not detailed enough on aerospace hose "Shelf-Life" to properly answer your question. When MIL-STD-1523 governing age control want obsolete and replaced with AS1933 there was a lot...
  12. johnSchwaner

    Hoses

    Taglia, Per MIl-DTL-8794 Fuel Immersion test: 72 hours! I often get asked this question. See my article "Aircraft Hose Age Limitations" at http://www.sacskyranch.com/h_life.htm "best before date" - Shelf life (acceptance life) is 8 years per AS 1933 revision A. (replaces MIL-STD-1523). Your...
  13. johnSchwaner

    Flareless,Flared & lip seal fitting

    If this is an aerospace application then beam-seal (Dynatube) fittings are replacing 37 degree for new applications because of their light weight. Suggest you contact Parker Stratoflex at (817) 738-6543. You might ask for Mr. Paul Quinn. or www.stratoflex.com Stratoflex is Parker's aerospace...
  14. johnSchwaner

    Unloading a torque wrench - spring weakening.

    Thank you for your responses. I was able to do a google search on spring relaxation to further my knowledge.
  15. johnSchwaner

    Unloading a torque wrench - spring weakening.

    It has been the common recommendation to return a snap style torque wrench to its lowest setting after usage. The often given reason is that the spring, if left compressed, will weaken. I have always questioned the reason (not the practice). Will the spring weaken (creep) under sustained...
  16. johnSchwaner

    Where do I find specifications for AN hardware?

    There are several specifications. Taking a look at MIL-B-6812B "Bolts, Aircraft" This will get you started as it lists all of the other specifications that you might need, such as dimensions, plating, testing, thread type, etc. You can download this document from my web site...
  17. johnSchwaner

    4130 steel protection

    Use boiled linseed oil as it has passed the time test. They tried something better on the Fokker F27 which resulted in the following statement from the Airworthiness Directive: "The interior of the tubes and end-fittings of the engine mount frames have been preserved with a film of...
  18. johnSchwaner

    Jam Nut locking device

    Dinosaur, The link has a picture of a double nut on a suspension walk bridge over the American River in Sacramento, CA. Two heavy hex nuts of the same size. Some engineer thought it was a good idea.http://files.engineering.com/getfile.aspx?folder=953e7349-eb1f-4ab7-874e-f67708ec7595&file=jamNut.jpg
  19. johnSchwaner

    fuel additive

    Do a Google search under "PRIST" by PPG Chemicals. This is a fuel system icing inhibitor. Years ago it was also advertised and sold as a icing inhibitor / biocide. In the late 1970's or 1980's they dropped the biocide from the label. I was told at the time by PPG that they would have to...
  20. johnSchwaner

    Assembly Torque Values

    Question - is it possible (feasable) to measure stud stretch?

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