AeroElectric-List Digest Archive

Mon 12/29/14


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 02:09 AM - Re: Re: How does the Ducatti rectifier/regulator work? (GTH)
     2. 03:11 AM - Re: Re: How does the Ducatti rectifier/regulat 	or work? (jan)
     3. 04:39 AM - Re: Re: How does the Ducatti rectifier/regulat 	or work? (GTH)
     4. 07:31 AM - Re: Re: How does the Ducatti rectifier/regulator work? (Charlie England)
     5. 07:48 AM - Re: Re: How does the Ducatti rectifier/regulator work? (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 02:09:03 AM PST US
    From: GTH <gilles.thesee@free.fr>
    Subject: Re: How does the Ducatti rectifier/regulator work?
    Le 28/12/2014 21:13, user9253 a crit : > > >> Don't mean to be contradictory or create any controversy, but Gilles webpage is in French not German. The dot fr is for France not Germany. > You are correct Bob McC. Whatever language it is, it is Greek to me. :D > Bob, Joe and all, Windows 8 doesn't seem to like my old backups, but I may be able to retrieve most of the original article and spreadsheets we crafted at the time with Jerome. In French only, I'm afraid. Translating the whole article in English would be a major undertaking, but feel free to ask if you need some clarification as to the meaning of any term or paragraph. Season's Greetings Gilles http://contrails.free.fr


    Message 2


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    Time: 03:11:40 AM PST US
    From: jan <jan@CLAVER.DEMON.CO.UK>
    Subject: Re: How does the Ducatti rectifier/regulat or
    work? Just trying to add some more 'geographical info' The link is to a Belgians web site .be is Belgium ... Half of the country speak French and the other half speak Dutch (Flemish) .. :-) I note that the Regulator ... they have listed on the circuit has Germany written on it .. and the diagram ... Not surprising as Rotax is from Austria .. and they speak German in Austria ... I know .. very confusing !! Happy xmas and a good new year !! :-) -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bob McCallum Sent: 28 December 2014 18:00 Subject: RE: AeroElectric-List: Re: How does the Ducatti rectifier/regulator work? <robert.mccallum2@sympatico.ca> Joe; Don't mean to be contradictory or create any controversy, but Gilles webpage is in French not German. The dot fr is for France not Germany. If Google was asked to translate from German that's perhaps how some clarity was lost in the translation. Bob McC > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list- > server@matronics.com] On Behalf Of user9253 > Sent: Sunday, December 28, 2014 12:02 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Re: How does the Ducatti rectifier/regulator work? > > > Using Bob's formula and Gilles webpage info > http://www.aero-hesbaye.be/circuit_elec.htm > 5 pair of magnets x 6000 RPM / 60 seconds = 500 Hz maximum > BTW, Gilles' webpage is interesting. It is written in German. Google Chrome translated > it. But much is lost in translation, making some of it difficult to understand. During the > short circuit test, the Rotax dynamo put out 21 amps without overheating. > > The 22,000 microfarad capacitor improves the output waveform, but is it required by > avionics? (Not that I intend to remove mine.) > Joe > > -------- > Joe Gores > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436360#436360 > > > > > > > > _- > ===================================================== > ===== > _- > ===================================================== > ===== > _- > ===================================================== > ===== > _- > ===================================================== > ===== > >


    Message 3


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    Time: 04:39:51 AM PST US
    From: GTH <gilles.thesee@free.fr>
    Subject: Re: How does the Ducatti rectifier/regulat or
    work? Le 29/12/2014 12:24, jan a crit : > > Just trying to add some more 'geographical info' > > The link is to a Belgians web site .be is Belgium ... Half of the country > speak French and the other half speak Dutch (Flemish) .. :-) Jan and all, Great on the geographical info ! Some clarification about the Belgian website : the original article was published with our permission on the French homebuilt website foxpapa.com, but it disappeared due to some update mixup. Long story short, in the mean time the Belgian website had, well, "borrowed" the entire page (plus some pages from my own website) without us being informed, and so is now the sole Internet source for our article. Maybe I'll republish the article with the original pictures on Contrails ! some day. Best regards, Gilles http://contrails.free.fr


    Message 4


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    Time: 07:31:57 AM PST US
    From: Charlie England <ceengland7@gmail.com>
    Subject: Re: How does the Ducatti rectifier/regulator work?
    On 12/29/2014 4:07 AM, GTH wrote: > > Le 28/12/2014 21:13, user9253 a crit : >> >> >>> Don't mean to be contradictory or create any controversy, but Gilles >>> webpage is in French not German. The dot fr is for France not Germany. >> You are correct Bob McC. Whatever language it is, it is Greek to >> me. :D >> > Bob, Joe and all, > > Windows 8 doesn't seem to like my old backups, but I may be able to > retrieve most of the original article and spreadsheets we crafted at > the time with Jerome. > In French only, I'm afraid. > Translating the whole article in English would be a major undertaking, > but feel free to ask if you need some clarification as to the meaning > of any term or paragraph. > > Season's Greetings > Gilles > > http://contrails.free.fr > If the link above is to your article, by opening it with Google you can get a rough translation to English. Won't be perfect, but should be good enough to understand what's going on in the article.


    Message 5


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    Time: 07:48:33 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: How does the Ducatti rectifier/regulator
    work? At 11:02 2014-12-28, you wrote: > >Using Bob's formula and Gilles webpage info >http://www.aero-hesbaye.be/circuit_elec.htm >5 pair of magnets x 6000 RPM / 60 seconds = 500 Hz maximum >BTW, Gilles' webpage is interesting. It is written in >German. Google Chrome translated it. But much is lost in >translation, making some of it difficult to understand. During the >short circuit test, the Rotax dynamo put out 21 amps without overheating. > The 22,000 microfarad capacitor improves the output waveform, but > is it required by avionics? (Not that I intend to remove mine.) >Joe I'd forgotten about the work that Gilles and friends had accomplished on the Rotax 912/914 alternator system. The text of the article cites 200Hz @ 2400 rpm which confirms your extrapolation above. Experiments I conducted some years ago on the SD-8 and companion R/R failed to demonstrate much value for having the capacitor in place. I'll be doing some work on PM alternators and next generation rectifier/regulators over the next few months. I'll take a look at the value for including the large capacitor beyond the need to operate the system sans battery. "Back-in-the-day" . . . a rule of thumb for brute- force (single cap) filters was 1000uF/Amp of load downstream of a 60Hz rectifier. Effectiveness of filtering would be about 5x better at the operating frequency of the Rotax pm alternator. It seems likely that the capacitor was originally included to offer smoother output given the really trashy performance of phase-switched SCR's as regulators. We'll see . . . Bob . . .




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