Original Posted By: "Greg Cardinal"
Subject: Pietenpol-List: Jury Struts LocationDoes anyone know of the best location for the Piet jury struts and WHY you would chose that spot. Thanks I need some help on this one to keep going.Corky in La________________________________________________________________________________Date: Mon, 21 Aug 2000 13:57:49 -0600
Pietenpol-List: Jury Struts Location
Re: Pietenpol-List: Jury Struts Location
Original Posted By: Rcaprd(at)aol.com
Subject: Re: Pietenpol-List: Jury Struts LocationIn a message dated 8/21/00 12:35:37 PM Central Daylight Time, Isablcorky(at)aol.com writes:>Jury struts serve two, possibly three purposes. The first is to check negative G-load on the lift struts, in other words, keep them straight under compression loads, by placing them close to the midway point of the lift strut. The second purpose is to check harmonic vibration. To serve this purpose, the jury struts must not be placed at the exact midway point. There are some famous guitar players that use harmonics to make strange, and unusual sounds, by placing their fingers ever so lightly on the string, at the exact midway point of the string, but not stretching the string all the way down to the fret. By doing this, the strings vibration, above and below the finger location, is exactly the same. It makes for a sustained, high pitch vibration. The same thing will happen with the lift struts, and cause metal fatigue (but with no audible sound). Harmonics is the reason that the control horn should never be located at the exact midway point of a control surface. The third purpose is it is a really good location for a vane type airspeed indicator.Chuck GantzerWichita KS________________________________________________________________________________
Subject: Re: Pietenpol-List: Jury Struts LocationIn a message dated 8/21/00 12:35:37 PM Central Daylight Time, Isablcorky(at)aol.com writes:>Jury struts serve two, possibly three purposes. The first is to check negative G-load on the lift struts, in other words, keep them straight under compression loads, by placing them close to the midway point of the lift strut. The second purpose is to check harmonic vibration. To serve this purpose, the jury struts must not be placed at the exact midway point. There are some famous guitar players that use harmonics to make strange, and unusual sounds, by placing their fingers ever so lightly on the string, at the exact midway point of the string, but not stretching the string all the way down to the fret. By doing this, the strings vibration, above and below the finger location, is exactly the same. It makes for a sustained, high pitch vibration. The same thing will happen with the lift struts, and cause metal fatigue (but with no audible sound). Harmonics is the reason that the control horn should never be located at the exact midway point of a control surface. The third purpose is it is a really good location for a vane type airspeed indicator.Chuck GantzerWichita KS________________________________________________________________________________