From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] dynamic balance
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-1323775@logan.com>
Message-ID: <b94c28c2-38ea-52a5-0a94-fcaec1be842d@verizon.net>
Date: Fri, 19 Mar 2021 10:33:40 -0400
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Thanks Steve.

Seems that having the right hardware and software makes all the difference.

I my attempts the phase signal was all over the place. That's why I 
moved to adding a nut. Appears than one needs /two/ channels being 
sampled simultaneously: trigger pulse and accelerometer, to get proper 
phase info?

Can you explain the prop "3x (blade)" ? Some kind of air interaction 
between prop, airframe and ground? In flight the air would quickly move 
past the prop, sitting still on the ground one could imagine some 
standing waves?

Also,� why does so much engine vibration remain (relative to prop's)? I 
think you mentioned that you first balanced the engine and then the prop.

Finn

On 3/18/2021 9:45 PM, Steven W. Boese SBoese@uwyo.edu wrote:
> This photo shows the Signalexpress FFT processed data from balancing 
> the prop on the ground.� The prop 3X (blade) signal disappeared in flight.
>
> Steve Boese
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


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    <div class="moz-cite-prefix">Thanks Steve.<br>
      <br>
      Seems that having the right hardware and software makes all the
      difference.<br>
      <br>
      I my attempts the phase signal was all over the place. That's why
      I moved to adding a nut. Appears than one needs <i>two</i>
      channels being sampled simultaneously: trigger pulse and
      accelerometer, to get proper phase info?<br>
      <br>
      Can you explain the prop "3x (blade)" ? Some kind of air
      interaction between prop, airframe and ground? In flight the air
      would quickly move past the prop, sitting still on the ground one
      could imagine some standing waves?<br>
      <br>
      Also,� why does so much engine vibration remain (relative to
      prop's)? I think you mentioned that you first balanced the engine
      and then the prop.<br>
      <br>
      Finn<br>
      <br>
      On 3/18/2021 9:45 PM, Steven W. Boese <a class="moz-txt-link-abbreviated" href="mailto:SBoese@uwyo.edu">SBoese@uwyo.edu</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-1323775@logan.com">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
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        <span style="color:rgb(32, 31,
          30);font-size:14.6667px;background-color:rgb(255, 255,
          255);display:inline !important">This photo shows the
          Signalexpress FFT processed data from balancing the prop on
          the ground.� The prop 3X (blade) signal disappeared in flight.</span><br>
      </div>
      <div style="font-family: Calibri, Arial, Helvetica, sans-serif;
        font-size: 12pt; color: rgb(0, 0, 0);">
        <span style="color:rgb(32, 31,
          30);font-size:14.6667px;background-color:rgb(255, 255,
          255);display:inline !important"><br>
        </span></div>
      <div style="font-family: Calibri, Arial, Helvetica, sans-serif;
        font-size: 12pt; color: rgb(0, 0, 0);">
        <span style="color:rgb(32, 31,
          30);font-size:14.6667px;background-color:rgb(255, 255,
          255);display:inline !important">Steve Boese</span></div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">--
Homepage:  <a class="moz-txt-link-freetext" href="http://www.flyrotary.com/">http://www.flyrotary.com/</a>
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