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Message-ID: <5cf132c0708031807n42da8dd7m377f6176124f66ad@mail.gmail.com>
Date: Fri, 3 Aug 2007 20:07:24 -0500
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Tips on tuning
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Al,
It is a 76" 3-blade and an RD-2C box.  The max rpm the prop controller will
allow is 2700.

Mark S.


On 8/3/07, Al Gietzen <ALVentures@cox.net> wrote:
>
>   On 8/3/07, *Al Gietzen* <ALVentures@cox.net> wrote:
>
>
> Al,
>
> I think Chris B. brought this up earlier today.  I didn't respond, but you
> mentioned it, so then couldn't resist the urge to comment.  To refresh
> everyone's memory, I have a 20B with a 76" 3-blade constant-speed M/T prop.
> So, I can dial in the prop speed desired and the prop controller does the
> rest.  With it set to 2500 rpm, I'm seeing 7000 engine rpm on takeoff
> rolls.  (What a sweet sound!  It makes those Lycosaurus' sound like farm
> tractors.)  It will turn about 6700 - 6800 during static runups.  But this
> is a c/s prop, so your mileage may vary.
>
>
>
> Mark S.
>
>  What re-drive ratio do you have?  I have 2.17 : 1.  Are you running the
> 76" MT over 3200 rpm?
>
> Al
>
>

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<div>Al,</div>
<div>It is a 76&quot; 3-blade and an RD-2C box.&nbsp; The max rpm the prop controller will allow is 2700.&nbsp; </div>
<div>&nbsp;</div>
<div>Mark S.<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 8/3/07, <b class="gmail_sendername">Al Gietzen</b> &lt;<a href="mailto:ALVentures@cox.net">ALVentures@cox.net</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div lang="EN-US" vlink="blue" link="blue">
<div><span class="q">
<div>
<p style="MARGIN-LEFT: 0.5in"><span><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">On </span></font></span><span>8/3/07</span><span>, </span><b><span style="FONT-WEIGHT: bold"><span>Al Gietzen</span>
</span></b><span> &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:ALVentures@cox.net" target="_blank">ALVentures@cox.net</a>&gt; wrote:</span></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt"><br>Al,</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">I think Chris&nbsp;B. brought&nbsp;this up earlier today.&nbsp; I didn&#39;t respond, but you mentioned it, so&nbsp;then couldn&#39;t resist the urge to comment.&nbsp;&nbsp;To refresh everyone&#39;s memory, I&nbsp;have a 20B with&nbsp;a 76&quot; 3-blade constant-speed M/T prop.&nbsp; So, I can dial in the prop speed desired and&nbsp;the prop controller&nbsp;does the rest.&nbsp; With it&nbsp;set to 2500 rpm, I&#39;m seeing 7000 engine rpm&nbsp;on takeoff rolls.&nbsp; (What a sweet sound!&nbsp; It makes those Lycosaurus&#39; sound like farm tractors.)&nbsp; It will turn about 6700 - 6800 during static runups.&nbsp;&nbsp;But this is a c/s prop, so your mileage&nbsp;may vary. 
</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Mark S.&nbsp; </span></font></p></div></span>
<blockquote style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 6pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 4.8pt; BORDER-LEFT: #cccccc 1pt solid; MARGIN-RIGHT: 0in; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">

<div vlink="purple" link="blue">
<div>
<p><font face="Times New Roman" color="blue" size="3"><span style="FONT-SIZE: 12pt; COLOR: blue">What re-drive ratio do you have? &nbsp;I have 2.17 : 1.&nbsp; Are you running the 76" MT over 3200 rpm?</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</span></font></p></div></div></blockquote></div></div></blockquote></div><br>

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