---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 07/30/13: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:53 AM - twitching gauge needles. (bob noffs) 2. 04:09 AM - Re: twitching gauge needles. (James Kilford) 3. 12:13 PM - Re: FAR 23 and airplanes of any stripe (Robert L. Nuckolls, III) 4. 12:13 PM - Re: twitching gauge needles. (Robert L. Nuckolls, III) 5. 01:55 PM - Re: twitching gauge needles. (bob noffs) 6. 07:41 PM - Re: Footwell got burned! (Angus) ________________________________ Message 1 _____________________________________ Time: 03:53:08 AM PST US Subject: AeroElectric-List: twitching gauge needles. From: bob noffs a few weeks ago i posted about a friend with gauges that wouldn't hold still. as was suggested, when he put in a proper ground from battery to engine, his problems disappeared. bob noffs ________________________________ Message 2 _____________________________________ Time: 04:09:35 AM PST US Subject: Re: AeroElectric-List: twitching gauge needles. From: James Kilford That's great news! Bob's espousal of the common ground prevents or cures a multitude of aeroplane electrical sins. Happy flying! James On 30 July 2013 11:52, bob noffs wrote: > a few weeks ago i posted about a friend with gauges that wouldn't hold > still. as was suggested, when he put in a proper ground from battery to > engine, his problems disappeared. > bob noffs > > * > > * > > ________________________________ Message 3 _____________________________________ Time: 12:13:30 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: FAR 23 and airplanes of any stripe At 01:42 AM 7/30/2013, you wrote: >Damn Bob, you're so right! Why didn't I suggest that. Just charge >the battery at every stop and do away with the alternator all together. :) > >By the way, a 15 minute overload in the Cherokee probably falls >outside the definition of a "Nuisance Trip". I defined nuisance trip as a behavior in response to an expected, normal condition. >And if you'd opened the breaker on the input to the regulator you >probably would have been able to reset the Over Voltage Protection >circuit in the regulator and get the alternator back on line. Just a >guess that when the output breaker opened the output voltage spiked >and the OVP latched. Have to remove all the power to it to get it to >reset. But you probably knew that. Tried that. This event 'killed' something. It was before I owned the airport so I wasn't 'plugged in' to failure analysis and repairs needed to restore the system. Too many of our brothers in the heavier iron business believed that 60A nameplate rating for an alternator was a limit. Regulators for the generators replaced by alternators featured a calibrated current limit control relay. In this case, generator output and nameplate rating were in lockstep. Emacs! An alternator is inherently current limited but at a value dependent on temperature. The nameplate rating is worst case for max allowable operating temperature. In OTHER conditions, the user should expect MORE than nameplate output. Failure to understand this feature prompted the folks to keep the same breaker-to-nameplate rating as for the legacy generators thus setting the stage for the relatively rare but significant breaker tripping in response to a predictable and expected operating condition. This drove my recommendations for following in Beech's footsteps and using uber-robust current limiters for b-lead protection. Emacs! Note that a 35A ANL limiter will carry 80A at room temperature for ever . . . but hit it with a shorted diode fed by a battery and it opens in 100 mS or less. This style of protection will not nuisance trip. Bob . . . ________________________________ Message 4 _____________________________________ Time: 12:13:43 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: twitching gauge needles. At 05:52 AM 7/30/2013, you wrote: >a few weeks ago i posted about a friend with gauges that wouldn't >hold still. as was suggested, when he put in a proper ground from >battery to engine, his problems disappeared. Actually, it would have been better to take the instrument grounds to the engine and leave the battery tied to a common firewall ground . . . but what ever works! I'm pleased that his instruments are now more stable. Bob . . . ________________________________ Message 5 _____________________________________ Time: 01:55:48 PM PST US Subject: Re: AeroElectric-List: twitching gauge needles. From: bob noffs i dunno, the battery and engine/firewall were connected by the fuselege!. bob noffs On Tue, Jul 30, 2013 at 2:13 PM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > nuckolls.bob@aeroelectric.com**> > > > At 05:52 AM 7/30/2013, you wrote: > >> a few weeks ago i posted about a friend with gauges that wouldn't hold >> still. as was suggested, when he put in a proper ground from battery to >> engine, his problems disappeared. >> > > Actually, it would have been better to take the > instrument grounds to the engine and leave the battery > tied to a common firewall ground . . . but what ever > works! I'm pleased that his instruments are now > more stable. > > > Bob . . . > > ________________________________ Message 6 _____________________________________ Time: 07:41:48 PM PST US Subject: AeroElectric-List: Re: Footwell got burned! From: "Angus" loll fucking ugly chink girl got burned in the face from her chink boyfriend. loll japan sucks ass -------- http://www.rctophobby.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405689#405689 ------------------------------------------------------------------------------------- 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.