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From: "Jeremy Fisher" <jffisher@gmail.com>
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Subject: Re: [LML] Re: Indicated Airspeed Error
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Rick,

It sounds to me as though you have position error, caused by the position of
your static source.  It is present on all aircraft, but is usually kept
minimal.  Being experimental, we have more variation than normal.  If so,
you have two possible solutions.  You can measure the error, which should be
repeatable, and apply it as a correction factor.  Or you can try moving your
static source to see if you can find a better compromise.  A small change
can make a difference.

Have you checked with other ES builders to see if they have the same static
source position, and if they have similar errors?  Of course they may not
know (or want to know if they are showing exceptional performance!).

Jerry


On 4/3/07, Rick Argente <ricargente@cs.com> wrote:
>
>  Scott/Rob/Marv,
>
> Thanks for the responses/suggestions so far!
>
> It appears that we should inspect/investigate the static side of the
> airspeed equation.  Maybe water or small bugs or dirt in the static system?
> Definitely worth checking very closely...
>
> While we were flying in close formation, at the same altitude, if
> never occurred to us to verify altitude readings.  If there were any
> significant differences, this would have indicated some sort of problem with
> the static port...
>
> I guess we have our worked cut out for us!
>
> Thanks again,
> Rick
>

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<div>Rick,</div>
<div>&nbsp;</div>
<div>It sounds to me as though you have position error, caused by the position of your static source.&nbsp; It is present on all aircraft, but is usually kept minimal.&nbsp; Being experimental, we have more variation than normal.&nbsp; If so, you have two possible solutions.&nbsp; You can measure the error, which should be repeatable, and apply it as a correction factor.&nbsp; Or you can try moving your static source to see if you can find a better compromise.&nbsp; A small change can make a difference.
</div>
<div>&nbsp;</div>
<div>Have you checked with other ES builders to see if they have the same static source position, and if they have similar errors?&nbsp; Of course they may not know (or want to know if they are showing exceptional performance!).&nbsp; 
</div>
<div>&nbsp;</div>
<div>Jerry<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 4/3/07, <b class="gmail_sendername">Rick Argente</b> &lt;<a href="mailto:ricargente@cs.com">ricargente@cs.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><font face="Arial" size="2"><span>Scott/Rob/Marv,</span></font></div>
<div><font face="Arial" size="2"><span></span></font>&nbsp;</div>
<div><font face="Arial" size="2"><span>Thanks for the responses/suggestions so far! </span></font></div>
<div><font face="Arial" size="2"><span></span></font>&nbsp;</div>
<div><font face="Arial" size="2"><span>It appears that we should inspect/investigate the static side of the airspeed equation.&nbsp; Maybe water or small bugs or dirt in the static system?&nbsp; Definitely worth checking very closely...
</span></font></div>
<div><font face="Arial" size="2"><span></span></font>&nbsp;</div>
<div><font face="Arial" size="2"><span>While we&nbsp;were flying in close formation, at the same altitude, if never&nbsp;occurred to&nbsp;us to verify&nbsp;altitude readings.&nbsp;&nbsp;If there were any significant&nbsp;differences, this would have indicated some sort of problem with the static port...&nbsp;&nbsp;
</span></font></div>
<div><font face="Arial" size="2"><span></span></font>&nbsp;</div>
<div><font face="Arial" size="2"><span>I&nbsp;guess we have our worked cut out for us!</span></font></div>
<div><font face="Arial" size="2"><span></span></font>&nbsp;</div>
<div><font face="Arial" size="2"><span>Thanks again,</span></font></div>
<div><font face="Arial" size="2"><span>Rick&nbsp;&nbsp;&nbsp; </span></font></div></div></blockquote></div><br>

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