---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 01/27/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:00 AM - Re: Difference between LR3C and SB1A Regulators (Robert L. Nuckolls, III) 2. 08:13 AM - New horizons (Robert L. Nuckolls, III) 3. 10:19 AM - Re: B&C SD-8 and PM alternators in general (jonlaury) ________________________________ Message 1 _____________________________________ Time: 06:00:07 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Difference between LR3C and SB1A Regulators At 07:31 PM 1/26/2016, you wrote: >Thanks Bob > >So, normally in flight both field lines (to MAIN ALT and to STANDBY >ALT) should be On? >In this case, we can say that theoretically both alternators are >producing electricity, but there's no current flowing in the wire >that comes from the "weaker" alternator? Pretty close . . . It's not easy to parallel two alternators onto a single bus without special circuitry within the regulators (not unlike the current sensor on the B&C standby regulators) that 'steers' the two alternators into sharing a load. More often than not, finely tuned but independent regulators drift apart far enough that one alternator will 'hog' the load and the other relaxes. We wrestled with that fact on many of the light twins in TC aviation (C336/337, B55, C303T, etc.) We exploited that behavior at B&C in the design of the SB series regulators by deliberately setting the secondary regulator 1.0 volt or so BELOW nominal bus voltage. The behavior was predictable . . . the secondary alternator's field voltage was suppressed to zero and although still rotating . . . it produces no output current. When the main alternator quits or is shut down, bus voltage sags and the secondary regulator wakes up it's companion alternator. We added sensing features unique to stand-by service to detect this awaking to light the ALT LOADED annunciator and then to flash it if present loads on the alternator exceeded its ratings. > >And what about flying with only the MAIN ALT field switch On, and >the Backup ALT field switch Off, the latter only to be flipped On by >the pilot when he notices no current is flowing from the MAIN ALT? >Is this not recommended? Your choice. In fact . . . should you choose this mode of operation, it is not necessary to use an SB series regulator on the standby alternator . . . nor do you need to adjust it to a lower set-point. It's simply a second alternator held in reserve to be brought on line when your ACTIVE NOTIFICATION of LOW VOLTAGE says the #1 alternator went to sleep or died. We'll be exploring operational options for the next generation of regulators with an goal of lowering parts counts while improving/simplifying operability. We've learned quite a lot about this business over the last 30 years! Bob . . . ________________________________ Message 2 _____________________________________ Time: 08:13:45 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: New horizons At 11:39 PM 1/26/2016, you wrote: >Bob, >We really appreciate your ongoing efforts to make affordable flying safe. >I am sure there are hundreds, if not thousands >of lurkers like myself that learn something new on this forum every day.=C2 >...and all this between ambulance driving =C2 Thank you sir. Actually, in a 1000 sq/mi county of only 5300 or so souls, it's pretty quiet around the hospital . . . a few calls per week. But for the hospital to maintain it's certifications the ambulance service needs to be a 24/7/365 operation. Most days of being 'on call' do not get you out on the road. At the same time, those who ARE on call have to be minutes away from responding . . . it can kick a big hole in your life-options. We don't expect to be taxed heavily for time after the classes are completed but the goal is to reduce on-call loads for all volunteers to something on the order of 20 hours a month and few of those will be really busy. My own availability weekday mornings will probably have me making patient transfers to outlying hospitals during times the other folks are working . . . Our proximity to the facilities makes it particularly convenient for us. The Medevac Helipad is only 1/2 mile east of us on the county road in front of the house. Emacs! Bob . . . ________________________________ Message 3 _____________________________________ Time: 10:19:27 AM PST US Subject: AeroElectric-List: Re: B&C SD-8 and PM alternators in general From: "jonlaury" Hi Bob, Does B&C use SolidWorks as their CAD software? If it does, SW supports E-viewer whereby a customer/collaborator can view and manipulate 3D SW files, make notations, generate measurements, hide or make transparent parts of a drawing among other capabilities. Its very intuitive, needing no manual, and FREE. My M.E. and I review his production drawings, of a machine I produce, in this way and hes 300 miles distant. The website suggests that it supports DWG and DXF drawings from other programs too. http://www.edrawingsviewer.com/ John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=452360#452360 ------------------------------------------------------------------------------------- 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.