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AMORISSON4 I confirm the report in question is NACA 1262. After a search with google I managed eventually to download it on my computer. TMOOSE is abosolutely right ( thanks again ) the information provided in NACA 1262 are unvaluable. Quite interesting is the conclusion that the fatigue...

Thanks Tmoose, can you tell me where I can find NACA 1262, I searched the NACA database but I could not find it. I was quite interested in this report as I understood that there are some information also on the effects of post welding heat treatments. Regards Ameolive

Many thanks to all for the reply as a matter of fact the pipes in question are part of a SAE 4130 frame supporting a rescue hoist used for human external cargo operation with helicopters. So from this point of view is a critical installation and all the relevant precautions/ conservativism has...

Dear all I really appreciate if some of you can provide with some guidelines regarding knock-down factors to apply to material fatigue allowables for the fatigue analysis of a welded joint. I'm asking this because I been reviewing a fatigue analysis of a welded joint connecting two pipe...

Woh, I wish I had the same possibility of knowing Prouty as you had ! Although I have been working in the field of the certification of civil helicopter for 13 years I still have to find a text written in more plain and accurate way than Prouty's articles and books. Getting back to your 2rev...

For two-bladed helicopters only a 2/rev vibrations or any multiple of 2/rev are transmitted from the blades to the airframe ( for refeence you may consult Ch 24 of Even More Helicopter Aerodynamics by R.W. Prouty ). The reason for that resides in the physics of the pulsating forces acting on a...