Original Posted By: leonstefanhutks(at)webtv.net (Leon Stefan)
Subject: Pietenpol-List: "a little play in the lower end of strut">>The note on the struts page says "lower end of strut is given a little play>to avoid chances of crystalizing fuse fitting". Does this mean to enlarge>the hole in the fuse fitting , or not to "crush" the streamlined tube ,,,or>what?>I don't understand the concept.>thanks>walt>----------------------------------------------------->Click here for Free Video!!>http://www.gohip.com/freevideo/>>______ ... __________
Pietenpol-List: "a little play in the lower end of strut"
Pietenpol-List: "a little play in the lower end of strut"
Original Posted By: "John McNarry"
The note on the struts page says "lower end of strut is given a little playto avoid chances of crystalizing fuse fitting". Does this mean to enlargethe hole in the fuse fitting , or not to "crush" the streamlined tube ,,,orwhat?I don't understand the concept.thankswalt-----------------------------------------------------Click here for Free Video!!http://www.gohip.com/freevideo/________ ... __________
The note on the struts page says "lower end of strut is given a little playto avoid chances of crystalizing fuse fitting". Does this mean to enlargethe hole in the fuse fitting , or not to "crush" the streamlined tube ,,,orwhat?I don't understand the concept.thankswalt-----------------------------------------------------Click here for Free Video!!http://www.gohip.com/freevideo/________ ... __________
Re: Pietenpol-List: "a little play in the lower end of strut"
Original Posted By: walter evans
Walter In the machinery repair bussiness, I often get the statment that apart "chrystalized and broke". However all metals are chrystaline instucture the only time you will actually be able to see the structure iswhen the part is fractured, usually by repeated stress cycling, any othercutting method smears the chrystals and then we don't see them. The heattreating that is done on metals changes the size of the chrystals andrearranges their structural patterns. Smaller denser structural patternsusually relates to harder and more brittle material. I don't know why the note is on the strut page, but my guess is thatthere is some bending moment that is transferred from the strut to thefitting. A slightly larger hole in the connection would allow some movementand reduce the bending action. I would be more concerned that the weldingdone in the fuse fitting was allowed to cool slowly to "normalize" themetal. Forced cooling with ferrous metals usually results in localizedhardening and stress failures.Hope this helps.John Mc----- Original Message -----
Walter In the machinery repair bussiness, I often get the statment that apart "chrystalized and broke". However all metals are chrystaline instucture the only time you will actually be able to see the structure iswhen the part is fractured, usually by repeated stress cycling, any othercutting method smears the chrystals and then we don't see them. The heattreating that is done on metals changes the size of the chrystals andrearranges their structural patterns. Smaller denser structural patternsusually relates to harder and more brittle material. I don't know why the note is on the strut page, but my guess is thatthere is some bending moment that is transferred from the strut to thefitting. A slightly larger hole in the connection would allow some movementand reduce the bending action. I would be more concerned that the weldingdone in the fuse fitting was allowed to cool slowly to "normalize" themetal. Forced cooling with ferrous metals usually results in localizedhardening and stress failures.Hope this helps.John Mc----- Original Message -----
Re: Pietenpol-List: "a little play in the lower end of strut"
Original Posted By: walter evans
John and Leon,Thanks , now I see. If the center of the strut moves/vibrates when flying,it is prying or flexing at the strut fitting , where the movement isperpendicular to the bolt.At the wing end, it can pivot at the bolt. I planned on jury struts, so Ishould be ok.Thanks guys.walt-----------------------------------------------------Click here for Free Video!!http://www.gohip.com/freevideo/-----Original Message-----
John and Leon,Thanks , now I see. If the center of the strut moves/vibrates when flying,it is prying or flexing at the strut fitting , where the movement isperpendicular to the bolt.At the wing end, it can pivot at the bolt. I planned on jury struts, so Ishould be ok.Thanks guys.walt-----------------------------------------------------Click here for Free Video!!http://www.gohip.com/freevideo/-----Original Message-----