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Message-ID: <1b4b137c0807171527x572cfe4sebbeac4c9e781c47@mail.gmail.com>
Date: Thu, 17 Jul 2008 18:27:18 -0400
From: "Tracy Crook" <tracy@rotaryaviation.com>
Sender: rwstracy@gmail.com
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Lean of Peak operation.
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On Fri, Jun 27, 2008 at 11:31 AM, Ernest Christley <echristley@nc.rr.com>
wrote:

> Lynn Hanover wrote:
>
>> Once you finish, you may have 6 different flow rates in 6 cylinders. Since
>> the fuel delivery is based on airflow and a look at the itake system shows
>> 6
>> differing lengths of tubing, 6 different injectors seems like the right
>> answere.
>>
>>
>>
> ...
>
>> It should work just fine in a rotary, so long as fuel flow in both
>> housings
>> is about the same. The troubled engine feel is when one housing is
>> performing less well than the other. So when leaning one housing has
>> peaked
>> before or after the other, or has reached well lean of peak before the
>> other.
>>
>>
> It should be possible to imitate the same effect using computer control.
>  It would require that the computer control injectors individually, and that
> it has input from EGTs or a wideband O2 sensor for each rotor.  The concept
> is trivial...the implementation somewhat less so.
>
>
EC2/3 has this capability built in.  Mode 4 (&5 on 20B) controls this
function.  Running far LOP smoothly does depend on mixtures being well
ballanced.  If well ballanced, the engine does not get rough when turning
the mixture control way down.  When you reach the limit, the engine should
just suddenly stop with almost no warning (other than the declining rpm as
you lean).

Tracy


>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir="ltr"><br><br>
<div class="gmail_quote">On Fri, Jun 27, 2008 at 11:31 AM, Ernest Christley &lt;<a href="mailto:echristley@nc.rr.com">echristley@nc.rr.com</a>&gt; wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="Ih2E3d">Lynn Hanover wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Once you finish, you may have 6 different flow rates in 6 cylinders. Since<br>the fuel delivery is based on airflow and a look at the itake system shows 6<br>
differing lengths of tubing, 6 different injectors seems like the right<br>answere.<br><br>&nbsp;<br></blockquote></div>... 
<div class="Ih2E3d"><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">It should work just fine in a rotary, so long as fuel flow in both housings<br>is about the same. The troubled engine feel is when one housing is<br>
performing less well than the other. So when leaning one housing has peaked<br>before or after the other, or has reached well lean of peak before the<br>other.<br>&nbsp;<br></blockquote></div>It should be possible to imitate the same effect using computer control. &nbsp;It would require that the computer control injectors individually, and that it has input from EGTs or a wideband O2 sensor for each rotor. &nbsp;The concept is trivial...the implementation somewhat less so.<br>
<font color="#888888"><br></font></blockquote>
<div>&nbsp;</div>
<div>EC2/3 has this capability built in.&nbsp; Mode 4 (&amp;5 on 20B) controls this function.&nbsp; Running far LOP smoothly does depend on mixtures being well ballanced.&nbsp; If well ballanced, the engine does not get rough when turning the mixture control way down.&nbsp; When you reach the limit, the engine should just suddenly stop with almost no warning (other than the declining rpm as you lean).&nbsp; </div>

<div>&nbsp;</div>
<div>Tracy </div>
<div>&nbsp;</div>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><font color="#888888"><span id=""></span><br><br>--<br>Homepage: &nbsp;<a href="http://www.flyrotary.com/" target="_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub: &nbsp; <a href="http://mail.lancaironline.net:81/lists/flyrotary/List.html" target="_blank">http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br></font></blockquote></div><br></div>

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