hansking12
Senior Heliman
Location: irvine, ca
| hardened shaft manufacturingactually droid, i haven't begun to answer. typically, when hollow (or solid) shafts are manufactured, they have a tolerance which can effectively be reduced through mechanical straightening. now, hold on to your hat, because when these aforementioned shafts are put through heat treat (or mechanical means--but i doubt it) to harden them through typically martensitic transformation, they come out-----bent!!! so then, they are mechanically straightened again, prior to shipment.
of course, if there is a kink or something more than a slight bend, the grain structure would be significantly compromised upon forcibly bending it back beyond the elastic region. i would not try and straighten a kinked or significantly bent shaft.
droid, if you want to talk about stress risers, please pm me and we can start a whole new discussion on the concentration of stress along the main shaft and across various cross sections of it before, during and after manufacture, whilst installed, and whilst running. perhaps you could use that knowledge of yours to come up with a nice finite element analysis using the sw of your choice whilst not assuming constant material properties throughout the main shaft due to surface hardening. or you could choose to deflect the topic and try and stir up something else which has obviously been your preferred method.
i would prefer to keep the discussion within the realm of us flying the helicopters. i would also like to keep the discussions simple and effective.
yes, i have somewhat of an academic background, however, i do not pretend to know it all and i do not exist in an academic vacuum. i'm always open to logical and open discussion and analysis. i have found through my career and life experience that those who think they know it all and are very vocal about it, often have the most to learn. i try to speak softly.
oh, and droid "You don't know me, you don't who i am or what i am." sound familiar? oh, and since you now know everything you wanted about me, how about coming clean and not hiding behind a screen name? who are you really? or are you ashamed to let everyone know who you really are? after all, someone who hides behind a screen name and asks then to be taken seriously has something to hide, wouldn't you say? i am who my screen name says i am. i populated my profile. why don't you? now i have to go and fly again.
hope this helps,
hans |
.. I am sure other people will ring in on this topic.
(use a softer material to pad/distribute the force or you might get the localized stress risers which droid rightfully spoke of--hence the aluminum v block)
