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Date: Mon, 3 Sep 2007 09:23:49 -0500
From: "Thomas Jakits" <rotary.thjakits@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Need a much softer damper for the single rotor
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What are you doing in R/C?

TJ

private is okay! thjakits@gmail.com


On 9/3/07, Russell Duffy <rusty@radrotary.com> wrote:
>
>  Greetings,
>
> I decided it was time to prove what I thought I knew about the single
> rotor prop resonance.  When I went from the shore 60 damper to the shore 50,
> it seemed much better, so I decided to hack the shore 60 into something even
> softer than the shore 50 to test the theory further.
>
> I started by drilling a couple 3/8" holes through the six faces of the
> damper.  It seemed much better at home, but when I compared it to the shore
> 50, it was still harder.  I then tried drilling holes perpendicular to the
> original holes, but it didn't make much difference.  Finally, I just hacked
> out a notch on the inside of each segment.  This is certainly softer than
> the shore 50, though not by as much as you'd imagine.  Clearly I'd never fly
> it like this.
>
> What I found was that I could run the engine as low as 2000 rpm, and the
> fore/aft prop movement was almost non-existent.  It's an  absolute night and
> day difference from what I had with even the shore 50 damper.  There's some
> of the engine vibration you'd expect from having no flywheel, but it's still
> smoother than the Rotax 582 on my gyro.
>
> Bottom line is that the engine should be perfectly usable if I can come up
> with a soft, but strong damper.  I'm thinking RV-12, maybe on floats
> in honor of my new ASES rating :-)
>
> Cheers,
> Rusty (spending too much time on R/C stuff)
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
>

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<div>What are you doing in R/C?</div>
<div>&nbsp;</div>
<div>TJ</div>
<div>&nbsp;</div>
<div>private is okay! <a href="mailto:thjakits@gmail.com">thjakits@gmail.com</a><br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/3/07, <b class="gmail_sendername">Russell Duffy</b> &lt;<a href="mailto:rusty@radrotary.com">rusty@radrotary.com</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div><span><font face="Arial">Greetings,</font></span></div>
<div><span><font face="Arial"></font></span>&nbsp;</div>
<div><span><font face="Arial">I decided it was time to prove what I thought&nbsp;I knew about the single rotor prop resonance.&nbsp; When I went from the shore 60 damper to the shore 50, it seemed much better, so I decided to hack the shore 60 into something even softer than the shore 50 to test the theory further.&nbsp;&nbsp;
</font></span></div>
<div><span><font face="Arial"></font></span>&nbsp;</div>
<div><span><font face="Arial">I started by drilling a couple 3/8&quot; holes through the six faces of the damper.&nbsp; It seemed much better at home, but&nbsp;when I compared it to the shore 50, it was still harder.&nbsp; I then tried drilling holes perpendicular to the original holes, but it&nbsp;didn&#39;t make much difference.&nbsp; Finally, I just hacked out&nbsp;a notch on the inside of each segment.&nbsp; This is certainly softer than the shore 50, though not by as much as you&#39;d imagine.&nbsp;&nbsp;Clearly I&#39;d never fly it like this.&nbsp; 
</font></span></div>
<div><span><font face="Arial"></font></span>&nbsp;</div>
<div><span><font face="Arial">What I found was that I could run the engine as low as 2000 rpm, and the fore/aft prop movement was almost non-existent.&nbsp; It&#39;s an &nbsp;absolute night and day difference from what I had with&nbsp;even the shore 50 damper.&nbsp; There&#39;s some of the engine vibration you&#39;d expect from having no flywheel, but it&#39;s still smoother than the Rotax&nbsp;582 on my gyro.&nbsp;&nbsp;
</font></span></div>
<div><span></span>&nbsp;</div>
<div><span><font face="Arial">Bottom line is that&nbsp;the engine should be perfectly usable if I can come up with a soft, but strong damper.&nbsp; I&#39;m thinking RV-12, maybe on floats in&nbsp;honor of my new ASES rating :-)</font></span>
</div>
<div><span></span>&nbsp;</div>
<div><span><font face="Arial">Cheers,</font></span></div>
<div><span><font face="Arial">Rusty (spending too much time on R/C stuff)</font>&nbsp;</span></div>
<div><span></span>&nbsp;</div>
<div><span>&nbsp;</span></div></div><br>--<br>Homepage: &nbsp;<a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.flyrotary.com/" target="_blank">http://www.flyrotary.com/</a><br>Archive and UnSub: &nbsp; <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://mail.lancaironline.net:81/lists/flyrotary/List.html" target="_blank">
http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br><br><br clear="all"></blockquote></div><br>

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