---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 01/02/15: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:25 AM - Re: Field of grounds with local bat ground (floridawing) 2. 09:28 AM - Subject: Re: How does the Ducatti rectifier/regulator work? (Robert L. Nuckolls, III) 3. 09:52 AM - Rotax PM regulator (C&K) 4. 03:36 PM - Order (Richard Girard) 5. 03:51 PM - Re: Field of grounds with local bat ground (Robert L. Nuckolls, III) 6. 03:52 PM - Re: Re: Field of grounds with local bat ground (Robert L. Nuckolls, III) 7. 04:06 PM - Re: Order (Larry Mac Donald) 8. 06:47 PM - Re: Field of grounds with local bat ground (Jim Kale) 9. 09:06 PM - Re: Field of grounds with local bat ground (floridawing) 10. 09:47 PM - Re: Re: Field of grounds with local bat ground (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 06:25:44 AM PST US Subject: AeroElectric-List: Re: Field of grounds with local bat ground From: "floridawing" Thank you everyone for the information! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436522#436522 ________________________________ Message 2 _____________________________________ Time: 09:28:54 AM PST US From: "Robert L. Nuckolls, III" Subject: Subject: AeroElectric-List: Re: How does the Ducatti rectifier/regulator work? Subject: AeroElectric-List: Re: How does the Ducatti rectifier/regulator work? From: "Eric M. Jones" I hesitate to inject my questions about the schematic of the Ducati dynamo regulator. But what is that little unlabeled zener diode feeding the base of the BF493S? And why does this look like an alternator regulator instead of a DC dynamo regulator? What am I missing? -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones(at)charter.net It has a lot in common with a wound-field regulator. See attached for an exemplar wound field regulator from 'back in the day' . . . The zener in the Ducati schematic is the regulation voltage reference serving the same purpose as D12 in the attached schematic. Noodle through the same rise-fall/on-off effects in the Ducati schematic and you will see that perturbations in bus voltage as sensed by the Ducati regulator causes a programmed triggering of the SCRs in the gated, bridge rectifier with the effect of throttling Dynamo energy about the regulator's set-point voltage. Bob . . . ________________________________ Message 3 _____________________________________ Time: 09:52:51 AM PST US From: C&K Subject: AeroElectric-List: Rotax PM regulator There are a couple of interesting quotes from Hawker (on the www.aero-hesbaye site) saying their Battery life is shortened by charging ripple. The link below seems to validate the statement. http://www.cdtechno.com/pdf/ref/41_2131_0212.pdf Makes me curious whether a large capacitor in the PM charging circuit might increase battery life a bit. Ken "The power being transmitted per burst, voltage ripples are more important. This can affect all powered systems and instruments but it is the battery that will suffer the most. To avoid premature aging, Hawker advocates RMS voltage ripple of less than 1% (battery not connected) ..." On 01/01/2015 3:38 PM, D L Josephson wrote: > > > It looks like an alternator regulator because that's what it is. The > output from the stator coils is single phase AC. > > There are many attempts online at drawing out the schematic of the > existing unit (it helps to search with the correct spelling of Ducati) > but I think the most complete one is in Gilles Thesee's > http://contrails.free.fr/elec_ducati_en.php. There is another website > in Belgium that has some of Gilles' earlier work, with some SPICE > simulations of the waveforms at > http://www.aero-hesbaye.be/circuit_elec.htm. Google Translate does a > good enough job if you don't have any French. > > ________________________________ Message 4 _____________________________________ Time: 03:36:04 PM PST US Subject: AeroElectric-List: Order From: Richard Girard Bob, Would you please contact me off forum, I do not have a current email address for you, sorry. Rick Girard do not archive -- Believe those who are seeking the truth, doubt those who find it. -Andre Gide ________________________________ Message 5 _____________________________________ Time: 03:51:04 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Field of grounds with local bat ground At 19:01 2015-01-01, you wrote: > >Grounds can be tricky on composite or wood airplanes. It is easy to get >different parts of the airplane with grounds not being well bonded to each >other. In that case, grounds can have different voltages on them and you >get what is commonly referred to as GROUND LOOPS. All sorts of funny things >happen to electrical equipment which don't want to operate like they should. >It is extremely difficult to trace the problems. Be very careful to have >all ground points bonded to each other very well with redundant paths if >possible. On metal airplanes, grounds are less difficult, but any metal >corrosion can cause the same problems. Actually, DC POWER grounding in composite airplanes is stone simple. See chapter 15 of the 'Connection. BONDING for purposes of achieving grounds at radio frequencies and issues of LIGHTNING protection are another matter entirely . . . usually ignored in OBAM aircraft as physically, economically and operationally impractical. Adding the necessary and useful ground plane under comm and xponder antennas is generally all that's required . . . also stone simple . . . see chapter 13 . . . Bob . . . ________________________________ Message 6 _____________________________________ Time: 03:52:25 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Field of grounds with local bat ground At 15:01 2015-01-01, you wrote: > >Thank you Vern and Charlie. Would I be better off adding a second >ground strap to the engine and running it up to the field of grounds >on the firewall or should I only use the one strap I have but remove >the end attached to the engine mount and attach it instead to the >field of grounds on the firewall? Thank you! Avoid burdening engine mount structure with electrical system duties. Single engine ground to your fire wall mounted 'forest of grounds' is recommended. Bob . . . ________________________________ Message 7 _____________________________________ Time: 04:06:59 PM PST US Subject: Re: AeroElectric-List: Order From: Larry Mac Donald On Jan 2, 2015, at 6:33 PM, Richard Girard wrote: > Bob, Would you please contact me off forum, I do not have a current email address for you, sorry. > > Rick Girard > do not archive > Hi Richard. It's Larry Mac Donald lm4@juno.com ____________________________________________________________ Fast, Secure, NetZero 4G Mobile Broadband. Try it. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT2 ________________________________ Message 8 _____________________________________ Time: 06:47:39 PM PST US From: "Jim Kale" Subject: RE: AeroElectric-List: Field of grounds with local bat ground It is only STONE SIMPLE if one knows where to get the information, can understand and apply the information. Thank you for the reference. -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Friday, January 2, 2015 5:49 PM Subject: RE: AeroElectric-List: Field of grounds with local bat ground --> At 19:01 2015-01-01, you wrote: > >Grounds can be tricky on composite or wood airplanes. It is easy to >get different parts of the airplane with grounds not being well bonded >to each other. In that case, grounds can have different voltages on >them and you get what is commonly referred to as GROUND LOOPS. All >sorts of funny things happen to electrical equipment which don't want to operate like they should. >It is extremely difficult to trace the problems. Be very careful to >have all ground points bonded to each other very well with redundant >paths if possible. On metal airplanes, grounds are less difficult, but >any metal corrosion can cause the same problems. Actually, DC POWER grounding in composite airplanes is stone simple. See chapter 15 of the 'Connection. BONDING for purposes of achieving grounds at radio frequencies and issues of LIGHTNING protection are another matter entirely . . . usually ignored in OBAM aircraft as physically, economically and operationally impractical. Adding the necessary and useful ground plane under comm and xponder antennas is generally all that's required . . . also stone simple . . . see chapter 13 . . . Bob . . . ________________________________ Message 9 _____________________________________ Time: 09:06:26 PM PST US Subject: AeroElectric-List: Re: Field of grounds with local bat ground From: "floridawing" Hi Bob, thank you. I will relocate the ground on my Rocket from the engine mount to the firewall with a field of grounds. The battery is still mounted in the back for W&B with a local ground. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436556#436556 ________________________________ Message 10 ____________________________________ Time: 09:47:09 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Field of grounds with local bat ground At 23:05 2015-01-02, you wrote: > >Hi Bob, thank you. I will relocate the ground on my Rocket from the >engine mount to the firewall with a field of grounds. The battery is >still mounted in the back for W&B with a local ground. Sounds like a plan . . . 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.