[Public-List] Alternators...

Anders Bro abro.gtu at gmail.com
Mon Jul 16 14:21:35 PDT 2018


Yes, so multiply that rpm by the pulley ratio to come up with alternator
rpm, and make your own plot of output vs engine rpm?

On Mon, Jul 16, 2018, 4:57 PM Gordon Laco via Public-List <
public-list at lists.alberg30.org> wrote:

> True, but it’s the engine that has the RPM instrument…
>
> Gordon Laco
> www.gordonlaco.com
> #426 Surprise
>
>
>
> > On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <
> public-list at lists.alberg30.org> wrote:
> >
> > Ya, but isn't that alternator rpm and not engine speed? Usually the
> pulleys
> > are sized to have alternator rpm higher than engine rpm.
> > Anders
> >
> > On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
> > public-list at lists.alberg30.org> wrote:
> >
> > Hello friends…
> >
> > Do any of you have data on what the output curve of our Atomic IV’s
> > alternators will put out at various RPM’s?
> >
> > I’m looking at Moyer’s modern alternators, and noticed that they give
> > output figures for ‘normal operating speed of 2000rpm’.  Well even with
> the
> > boosted rpm our Campbell prop allows, we still don’t get more than 1500
> > going flat out… we cruise quietly at 1200.
> >
> > I understand our factory supplied alternators are ’30 amp’ but what is it
> > really delivering at real operational rpms?
> >
> > I understand that at lower rpm’s the alternator isn’t ‘excited’ so
> delivers
> > little amperage…But I don’t know what the critical rpm rate is to achieve
> > excitement
> >
> > I don’t understand this whole subject as well as I’d like to.
> >
> > Gordon Laco
> > #426 Surprise
> >
> >
> >
> >
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