---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/11/15: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:50 AM - Magnetometers (BobbyPaulk@comcast.net) 2. 11:31 AM - Re: Pitot Heat Ground (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:50:27 AM PST US From: BobbyPaulk@comcast.net Subject: AeroElectric-List: Magnetometers When we were building two Zodiacs in the same hangar at the same time we stored the kit parts on opposite sides of the hangar to keep the confusion to a minimum. When we were calibrating the remote magnetometer in my plane the compass indicated 230 degrees on a north heading. Nobody could figure it out. Every heading was over 90 degrees off. I had located the Dynon magnetometer in the tail cone to get it away from any electrical or RF energy. I finally realized I could move the compass over 180 degrees by just moving the rudder cables sitting still. Someone ( ? ) had stored my rudder cables just above a DC welding machine. Duh! We degauzed the cables as best we could but had to re-locate the magnetometer. It is now the most accurate compass I have ever flown behind. Near perfect on any heading. Bobby ________________________________ Message 2 _____________________________________ Time: 11:31:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Pitot Heat Ground >That doesn't sound right.=C2 The strength of a >magnetic field should increase linearly with >current, but should fall off as a function of >distance cubed.=C2 A 3A current at 5 inches >should show the same deflection as a 10A current >at about 7.5 inches, not 14 inches.=C2 Did I miss something? Nope . . . looks like I punched the 1/sqrt button instead of 1/3rdrt . . . thank's for the heads-up! Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.