Today's Message Index:
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1. 02:07 AM - Re: Elevator pulsation (Greg McFarlane)
2. 08:49 AM - Re: Elevator pulsation (Bob Turner)
3. 12:21 PM - Re: Re: Elevator pulsation (Tim Olson)
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| Subject: | Re: Elevator pulsation |
JFI, ... For sure the whole horizontal tail plane shakes and buffets with high
power run ups on the ground, I think the solution to that is to keep that sort
of operation to the minimum required and if possible with the aircraft moving
especially for prop cycling. Regarding in flight, when on AP, our RV10 and AP
(TruTrac) is particularly sensitive to out of pitch trim and close attention
to trim is needed (or auto trim) otherwise the AP will cycle up and down to correct
the out of trim situation, in our case very easy to recognise because the
aircraft starts a little nodding motion. As far as elevator pulsation is concerned
generally when in flight, Im pretty sure that a lot of that is from turbulence
in and around the elevator horns and the lightening holes in the outer
horizontal rib, and that will vary depending on W&B. Others have found a marked
difference if those lightening holes are taped over or otherwise blocked.
From day one our RV10 (now flown 400hrs) has had all those holes blanked off
with tight fitting auto rubber blanking plugs that are securely contact glued
in. Weve never experienced any elevator pulsation. Cheers from Western Australia.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488980#488980
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| Subject: | Re: Elevator pulsation |
I seem to recall that Tim Olsen reported elevator pulsing on his -14?? He noted
that the fiberglass fairing on the elevator horn was thicker (vertical dimension)
than the matching piece on the stabilizer. He fixed that, the pulsation went
away. That is, if I remember correctly.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488983#488983
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| Subject: | Re: Elevator pulsation |
Thats not too far off, Bob, as far as Internet thread memory goes. :-) It was somebody
else with an RV 14 that had a pulsing. I just had occasional brief periods
when leveling out two crews trim that the plane would change trim just slightly
but very quickly.The other person that you were referring to did indeed
widen or I should say heighten his stabilizer tips so that they more completely
shielded the elevator from airflow. That fixed it for him. Mine are just slightly
smaller than the elevator horns. I think it is a definite case that you
should try to make sure that the stabilizer tips are as big or slightly bigger
than the elevator horns in height, but mine are not quite like that, unfortunately.
But it is a fairly occasional thing for me, and you have to be paying
attention to notice it. Mine is not currently fixed. Mainly because after having
it painted and having those tips fiberglass in over the rivet lines, the only
way to fix it is probably to tear the tips off and then repaint the stabilizer.
Thats probably not going to happen. At least not for something that is barely
noticeable and only occasional.But mine does not pulse up and down. Its
more like you can feel a difference when the elevator horn hits the air flow versus
when its not As far into the airflow.
Anyway, yeah, thats on the -14, but I think the parts are basically very similar.
Tim
> On Apr 27, 2019, at 10:48 AM, Bob Turner <bobturner@alum.rpi.edu> wrote:
>
>
> I seem to recall that Tim Olsen reported elevator pulsing on his -14?? He noted
that the fiberglass fairing on the elevator horn was thicker (vertical dimension)
than the matching piece on the stabilizer. He fixed that, the pulsation
went away. That is, if I remember correctly.
>
> --------
> Bob Turner
> RV-10 QB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=488983#488983
>
>
>
>
>
>
>
>
>
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