I do the same as Javier; increase power, or increase VP pitch to load the
engine. Always clears the vibration. I think it is back-lash in the
gearbox.
William
----- Original Message -----
From: "Barahona Alonso, Francisco Javier" <Javier.Barahona@aeasa.com>
Subject: RE: Europa-List: Worrying conundrum
<Javier.Barahona@aeasa.com>
>
> I have observed a similar vibration in some occasions just after take-off,
when reducing gas from full power. It happens around 4800 rpm. What I do is
to reduce a bit more and then increase it again if needed. So the vibration
disappears.
>
> I do not think it is related with carb icing. I fly in Spain with high
temperatures. My opinion is that it is a kind of resonance related with the
engine revolutions and plane attitude.
>
> Best regards
>
> Javier
>
> Classic 187, 912 UL
>
>
> <peterdavis@ntlworld.com> writes:
> > <peterdavis@ntlworld.com>
> >
> > I crave people's indulgence with this one.
> >
> > Last weekend I experienced a very slight vibration that lasted for a
> > few
> > minutes whilst flying. It was just audible and just noticeable
> > through the
> > control column. The frequency at 4800 rpm was about 2 or 3 beats per
> > second
> > and was very reminiscent of "interference" or "sympathetic"
> > vibration that
> > might occur if part of the 'plane was vibrating in sync. with the
> > engine.
> >
>
>
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