Depends on numerous variables including the prevailing friction level in th
e gearbox.
With the original Warp Drive mine had a zone of "unhappiness" centred aroun
d 4400rpm, so that band was always avoided. Later with an Arplast Ecoprop (
fixed pitch, about the same or greater inertia as the WD) that disappeared.
Ditto with a still later and so much smoother E-Props (fixed pitch). But t
he earlier "unhappiness" might alternately have been blade resonance, or li
ght detonation??
With a recently installed new engine (and the E-Props), 5000rpm has become
the "happiest" band; but still exploring.
Duncan McF
"...in feet up and having a beer" mode. All subjective.
On 27 December 2022 at 21:25 James <james@kingdom.ie> wrote:
> Pete,
> My 914 swings an Airmaster CS prop. Do you know what rpm setting(s) I
should avoid?
>
> Thanks
> James
>
> Sent from Outlook for Android https://aka.ms/AAb9ysg
>
> ---------------------------------------------
> From: owner-europa-list-server@matronics.com <owner-europa-list-serve
r@matronics.com> on behalf of Pete <peterz@zutrasoft.com>
> Sent: Tuesday, December 27, 2022 9:06:08 PM
> To: europa-list@matronics.com <europa-list@matronics.com>
> Subject: Re: Europa-List: Re: What did you do with your europa this w
eek - 22/12/22
>
>
> .And/or use an extremely light prop like the e-prop CS, and
keep the revs out of the resonance bands.
>
> :-)
>
> PeteZ
>
> > On Dec 27, 2022, at 3:04 PM, Area-51 <goldsteinindustrial@gmail.com
> wrote:
> >
mail.com>
> >
> > Thanks Peter great explanation there; and yes donuts are great but
when they break and when they do everything shakes to pieces real fast. So
in an aircraft not a great idea for prop drive; it would require some varia
nt which i will try out when a dead gearbox gets donated.
> >
> > The ultimate solution to this rotax component wear issue is not fly
=F0=9F=98=8A
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=509817#509817
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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