---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Sat 04/27/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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) ________________________________ Message 1 _____________________________________ Time: 02:07:51 AM PST US Subject: RV10-List: Re: Elevator pulsation From: "Greg McFarlane" 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 ________________________________ Message 2 _____________________________________ Time: 08:49:19 AM PST US Subject: RV10-List: Re: Elevator pulsation From: "Bob Turner" 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 ________________________________ Message 3 _____________________________________ Time: 12:21:33 PM PST US From: Tim Olson Subject: Re: RV10-List: 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 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 > > > > > > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv10-list Browse Digests http://www.matronics.com/digest/rv10-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.