---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 01/26/16: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:23 AM - Re: Temporary dilution of spare time (Art Zemon) 2. 07:48 AM - Re: Schematic for twin PM alternators (Paul Eckenroth) 3. 08:50 AM - Re: Temporary dilution of spare time (ashleysc@broadstripe.net) 4. 04:56 PM - B&C SD-8 and PM alternators in general (Robert L. Nuckolls, III) 5. 05:37 PM - Re: Difference between LR3C and SB1A Regulators (Carlos Trigo) 6. 09:42 PM - Re: B&C SD-8 and PM alternators in general (Bob Verwey) ________________________________ Message 1 _____________________________________ Time: 04:23:59 AM PST US Subject: Re: AeroElectric-List: Temporary dilution of spare time From: Art Zemon Very Very Cool!!! -- Art Z. -- http://CheerfulCurmudgeon.com/ *"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel* ________________________________ Message 2 _____________________________________ Time: 07:48:05 AM PST US Subject: AeroElectric-List: Re: Schematic for twin PM alternators From: "Paul Eckenroth" Joe Gores was kind enough to produce a schematic (enclosed) that pretty much answers all my concerns about the twin alternators. Since my amperage needs are less than 20 AMPs we will keep the two generators separate and treat them as primary and backup. The crowbar will break both the AC from the generator and the B lead from the voltage regulator eliminating any problems from the regulator. And then I read the post by GTH and the report he did for Contrails magazine regarding testing of the Rotax supplied regulator where they found that the regulator generated heat was proportional to the generated power. With this in mind and with the fairly high rate of failure of the Rotax regulator presumably due to heat, would it be likely that tying the two Revmaster generator outputs together after the regulators would result in less power produced by each and therefore longer life for the regulators. Possibly this could be done so there is flexibility to run individually as now planned or together. Would there be a way to monitor the output of the individual generators if tied together at the battery, to see how equal they are. So I would appreciate any comments and critiques regarding the schematic as it now stands and the alternate thought of combining them for less trauma to the regulators. Thanks for any feedback Paul Read this topic online here: http://forums.matronics.com/viewtopic.php?p=452301#452301 Attachments: http://forums.matronics.com//files/revmaster7a_1_186.pdf ________________________________ Message 3 _____________________________________ Time: 08:50:45 AM PST US From: ashleysc@broadstripe.net Subject: Re: AeroElectric-List: Temporary dilution of spare time Congratulations Bob; Neighbors helping neighbors is becoming increasingly important. And knowing what to do in a medical emergency is very empowering. Before starting guiding, our little company hired a climbing doctor to give a course entitled "What to do Before the Doctor Comes, When the Doctor Isn't Coming." Since then I have been first on the scene at two major car auto accidents, rescued two canoeists from a glacial river in Alaska (hypothermia), and set a compound fracture of the lower leg for a climber on a vertical cliff and got him down. (The leg didn't need to be reset.) I'm sure you will find use for your training. Keep up the good work! Cheers! Stu. ----- Original Message ----- From: "Robert L. Nuckolls, III" Sent: Monday, January 25, 2016 7:52:16 PM Subject: AeroElectric-List: Temporary dilution of spare time Dr. Dee and I are training to join our little community's volunteer EMT/Ambulance team. The M.L. hospital and ambulance barn are literally in my back yard . . . and maintaining a large enough crew to avoid overtaxing the troops is a bit of a challenge for our local hospital administrator. Tonight was our first of 55, 4 hour classes that should lead to national certification as an EMT. It's three nights a week . . . fortunately very close in one of the hospital's classrooms. Got the first check-ride in an ambulance last week. Need to do two or three more play-runs before I get on that schedule . . . man, that's a lumbering beast! I don't think it will seriously impact my time for the List . . .but then . . . I've not cracked a textbook in 50 years! The cool thing about it is that its all about neighbors looking out after neighbors. Should have the book-learn'n and labs done early May. Bob . . . ________________________________ Message 4 _____________________________________ Time: 04:56:44 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: B&C SD-8 and PM alternators in general A trip to Wichita today produced some CNC parts fabricated by a friend of mine that will enable me to finish a drive-stand for the vacuum pump pad driven PM alternators. There are some big changes coming for both the B&C product line and AeroElectric Connection recommendations for exploiting contemporary technology in rectifier-regulators for PM alternators. Things are getting much better in terms of robustness and price/performance of PM r-r technology. B&C has a perfectly satisfactory drive stand but my test equipment and inventory are located 110 miles away. The research and development effort is exceedingly hampered by thd separation. Looking forward to some new discoveries and recommendations supported by repeatable experiment in the not too distant future. Bob . . . ________________________________ Message 5 _____________________________________ Time: 05:37:18 PM PST US From: "Carlos Trigo" Subject: RE: AeroElectric-List: Difference between LR3C and SB1A Regulators 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? And what about flying with only the MAIN ALT field switch On, and the Backu p 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? Carlos . From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L =2E Nuckolls, III Sent: segunda-feira, 25 de Janeiro de 2016 01:14 Subject: Re: AeroElectric-List: Difference between LR3C and SB1A Regulators At 07:39 PM 1/23/2016, you wrote: Guys Can anybody please explain the difference(s), if any, between regulators LR3C and SB1A from B&C? The LR series regulators are designed to drive legacy alternators in either 14 or 28v systems. They feature internal ov protection and lv warning. The SB1 series regulators also feature ov protection but their lv warning systems are replaced by a circuit that monitors alternator output activity which is normally zero when the main alternator is running. Should the main alternator quit, bus voltage falls, the standby alternator wakes up and a panel mounted "ALTERNATOR LOADED" lamp illuminates to announce the change in system status. Further, an output current sensor on the b-lead will cause the ALT LOADED light to flash if there's too many demands on the SB alternator's capability. The pilot shuts things off until the light stops flashing. Bob . . . --- Este e-mail foi verificado em termos de v=C3=ADrus pelo software antiv=C3 =ADrus Avast. https://www.avast.com/antivirus ________________________________ Message 6 _____________________________________ Time: 09:42:16 PM PST US From: Bob Verwey Subject: Re: AeroElectric-List: B&C SD-8 and PM alternators in general 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. ...and all this between ambulance driving On 27 January 2016 at 02:53, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > nuckolls.bob@aeroelectric.com> > > A trip to Wichita today produced some CNC parts > fabricated by a friend of mine that will enable > me to finish a drive-stand for the vacuum pump pad > driven PM alternators. > > There are some big changes coming for both the > B&C product line and AeroElectric Connection > recommendations for exploiting contemporary technology > in rectifier-regulators for PM alternators. > > Things are getting much better in terms of > robustness and price/performance of PM r-r > technology. > > B&C has a perfectly satisfactory drive stand > but my test equipment and inventory are located > 110 miles away. The research and development > effort is exceedingly hampered by thd separation. > > Looking forward to some new discoveries and > recommendations supported by repeatable experiment > in the not too distant future. > > > Bob . . . > > -- Best... 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