Pietenpol-List: Jury Struts and Spar Routings

[matronics]

Original Posted By: Michael D Cuy
Subject: Pietenpol-List: Jury Struts and Spar RoutingsThanks for all the responses to the two questions I asked. I will continue to finish routing my spars.On the jury struts, I made a decision this afternoon to place the spare fitting for the jury at 49.5 inches from the butt of the spare. This I calculated in the following manner.Fundamental vibration of the wing section is 13 ft 2 1/2 in or 158.5 in.Divide by 2 and get the 1st harmonic, 79.25 in where lift strut fittings are placed. Further divide by 2 and get 2nd harmonic, 39.625 further divide by 2 for the 3d harmonic, 19.8125, further dividing by 2 to get the 4th harmonic 9.90 in. I added the 2d and 4th harmonics for a location of 49.5 inches. This is a node point where the natural vibration of the designated length of wood establishes its partials.I'm probably waaaaaay outside the ballpark on this theory but I think It will help minimize vibrations Corky in HOT La________________________________________________________________________________Date: Tue, 22 Aug 2000 10:36:53 -0400

[matronics]

Original Posted By: owner-pietenpol-list-server(at)matronics.com
And to think I just counted out to the fifth or sixth rib and fit themthere. I'll be listening for the inaudible vibrations next time I fly... :)Steve E-----Original Message-----

[matronics]

Original Posted By: Michael D Cuy

[matronics]

Original Posted By: Steve Eldredge
Subject: Re: Pietenpol-List: Jury Struts and Spar RoutingsWas just trying to find some logical point to locate them. No big dealCMC________________________________________________________________________________

[matronics]

Original Posted By: owner-pietenpol-list-server(at)matronics.com
All just in fun mind you.... Keep building and fly'nSteve E.-----Original Message-----