---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 01/10/10: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:36 AM - P-Static and Ground Loops? (Robert L. Nuckolls, III) 2. 06:57 PM - Re: Busbar Protection Coating (speedy11@aol.com) 3. 08:51 PM - Creative led position lights (Joe McKervey) ________________________________ Message 1 _____________________________________ Time: 11:36:37 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: P-Static and Ground Loops? Good Morning Bob On this forum and another I have been trying to solve a P-static problem with my glass airplane (not carbon).. It has been suggested by Chelton and others to run a large (#12) wire and individually ground the screens, radio stack, AHRS. These have ground wires as part of the connectors. One of the members on the other forum was concerned that it would cause a ground loop affecting the radios. Your opinion? P-static is a purely external effect on airplanes having to do with different materials being slid past each other with some vigor. Like rubbing your cat with a balloon or shuffling your shoes on synthetic carpet. Machines like Van de Graff generators can be fabricated with the notion of optimizing the effects and generating very large voltages . . . http://www.coe.ufrj.br/~acmq/electrostatic.html . . . but still small compared to lighting which is Mother Nature's own manifestation of P-static. In the case of p-staic on airplanes, the effect of flying through particulates (snow, rain, ice crystals, dust) at high velocities generates a virtual cloud that produces gazillions of micro-lightning strikes per second (static). Given that your radios occupy space within the man-made micro-climate that surrounds the airplane, the results can make the radios difficult if not impossible to use. Unfortunately, there's nothing you can do inside the airplane to mitigate the effects. Mitigation processes include: (1) altering the nature of the materials on the surface of the airplane to (a) reduce effectiveness as static generators or (b) make them conductive and/or (2) add static wicks to effect an orderly, low energy dissipation of surface charge. If you can turn the micro-strikes into pico-strikes, the energy in each strike (electromagnetically radiated noise) is too small to bother the radios. When your airplane is decidedly non-conductive, the task before you is not simple and indeed may not have a practical implementation. The suggestion for bonding things together inside the airplane will not produce a beneficial result. I don't know if there are any greybeards left at Hawker-Beech who would remember what we had to do on the Starship . . . the only ALL COMPOSITE airplane to be produced at Beech. I'll ask around. Bob . . . ________________________________ Message 2 _____________________________________ Time: 06:57:53 PM PST US From: speedy11@aol.com Subject: AeroElectric-List: Re: Busbar Protection Coating It took me literally 1 minute to cut the shrink wrap, position it, and heat shrink it. Perhaps very little return on investment, but also very little expenditure of $time$. Stan Sutterfield Do not archive While cosmetically pleasing, the dressing of bus bars doesn't reduce risks but it does distract you from what is probably more useful expenditure of $time$ on your project. ________________________________ Message 3 _____________________________________ Time: 08:51:02 PM PST US From: "Joe McKervey" Subject: AeroElectric-List: Creative led position lights Does anyone have a set of instructions they could attach to an e-mail for Creative Airs Led Position Light Kit. I'm referring to the unassembled kit. I've tried in vain to contact Bill Vondane, Thank you, Joe McKervey mckervey@charter.net ------------------------------------------------------------------------------------- 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.