From: "Steven W. Boese" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: flight conditions for HX data
Thread-Topic: [FlyRotary] Re: flight conditions for HX data
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Date: Wed, 30 Nov 2016 08:32:55 +0000
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Steve,

It is difficult to specify a delta P that would be suitable for effective c=
ooling because of all the other variables in the cooling system.  In my cas=
e, 2 inches of water pressure across the core of a Fluidyne DB-30618 oil co=
oler is more than sufficient to cool the oil at 85 deg F OAT in climb or sl=
ow flight.

Average pressure at the exchanger face with a piccolo tube is easier to mea=
sure and interpret and gives useful information concerning the behavior of =
the duct.

Velocity measurement requires both a pitot and a static pressure measuremen=
t at the location of interest.  This combined with the area of the duct and=
 the air temperature at the location of interest enables the calculation of=
 mass air flow rate.  Combining that with the delta T of the air across the=
 exchanger core enables the calculation of the rate of heat exchanged.  Thi=
s can be compared to the rate of heat exchange required as estimated from t=
he fuel flow rate and engine characteristics and serves as a reality check.

When assisting builders of a Zenith 601 with a Jabiru 6 cyl engine installa=
tion with cooling system concerns, we used four pressure sensors of the typ=
e you have except that they were differential pressure sensors.  We used th=
e 5 volt excitation from the Dynon D180 to power the sensors.   We used the=
 two normal fuel level inputs along with two of the GP inputs all configure=
d for capacitive fuel senders to log the data.  An additional logging instr=
ument was not required and no additional pilot workload was introduced when=
 collecting data in this way.

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2


________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of =
Stephen Izett <flyrotary@lancaironline.net>
Sent: Monday, November 28, 2016 5:31 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: flight conditions for HX data

Thanks for the data Steve.
Congrats on successfully reaccelerated the air coming out the back of the e=
xchanger.
Did you find in your research what kind of delta pressures we could aim at =
for a successful installation?

Ive got 4 or 5 MPX10GP's that Ill build into a little pressure sensor set t=
o grab data for first flight.
Ive not worked with reading pressures before. What would you recommend for =
the business end of the pressure pickup for:
1. Pitot velocity measurement?
2. Average pressure measurement?

Thanks
Steve


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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=
n-bottom:0;} --></style>
</head>
<body dir=3D"ltr">
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
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<p>Steve,</p>
<p>It is difficult to specify a delta P that would be suitable for effectiv=
e cooling because of all the other variables in the cooling system.&nbsp; I=
n my case, 2 inches of water pressure across the core of a Fluidyne DB-3061=
8 oil cooler&nbsp;is more than sufficient
 to cool the oil at 85 deg F OAT in climb or slow flight.</p>
<p>Average pressure at the exchanger face with a piccolo tube is easier to =
measure and interpret and&nbsp;gives useful information concerning the beha=
vior of the duct.</p>
<p>Velocity measurement requires both a pitot and a static pressure measure=
ment&nbsp;at the location of interest.&nbsp; This combined with the area of=
 the duct and the air temperature at the location of interest enables the c=
alculation of mass air flow rate.&nbsp; Combining
 that&nbsp;with the delta T of the air across the exchanger core enables th=
e calculation of the rate of heat exchanged.&nbsp; This can be compared to =
the&nbsp;rate of heat exchange required as estimated from the fuel flow rat=
e&nbsp;and engine characteristics and serves as a reality
 check.</p>
<p>When assisting builders of a Zenith 601 with a Jabiru 6 cyl engine insta=
llation with cooling system concerns, we used four pressure sensors of the =
type you have except that they were differential pressure sensors.&nbsp; We=
 used the 5 volt excitation from the
 Dynon D180 to power the sensors.&nbsp;&nbsp;&nbsp;We used&nbsp;the two nor=
mal fuel level inputs along with two of the GP inputs all configured for ca=
pacitive fuel senders to log the data.&nbsp; An additional logging instrume=
nt was not required and no additional pilot workload was
 introduced when collecting data in this way.</p>
<p></p>
<p></p>
<div><font face=3D"tahoma" size=3D"2">Steve Boese</font></div>
<div><font face=3D"tahoma" size=3D"2">RV6A, 1986 13B NA, RD1A, EC2</font></=
div>
<p></p>
<p></p>
<br>
<br>
<div style=3D"color: rgb(0, 0, 0);">
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font color=3D"#000000" face=3D"Calib=
ri, sans-serif" style=3D"font-size:11pt"><b>From:</b> Rotary motors in airc=
raft &lt;flyrotary@lancaironline.net&gt; on behalf of Stephen Izett &lt;fly=
rotary@lancaironline.net&gt;<br>
<b>Sent:</b> Monday, November 28, 2016 5:31 PM<br>
<b>To:</b> Rotary motors in aircraft<br>
<b>Subject:</b> [FlyRotary] Re: flight conditions for HX data</font>
<div>&nbsp;</div>
</div>
<div>Thanks for the data Steve.
<div>Congrats on successfully reaccelerated the air coming out the back of =
the exchanger.</div>
<div>Did you find in your research what kind of delta pressures we could ai=
m at for a successful installation?</div>
<div><br>
</div>
<div>
<div>Ive got 4 or 5 MPX10GP&#8217;s that Ill build into a little pressure s=
ensor set to grab data for first flight.</div>
<div>Ive not worked with reading pressures before. What would you recommend=
 for the business end of the pressure pickup for:</div>
<div>1. Pitot velocity measurement?</div>
<div>2. Average pressure measurement?</div>
<div><br>
</div>
<div>Thanks</div>
<div>Steve</div>
<div><font face=3D"Tahoma" size=3D"2">
<div><span id=3D"cid:18fea9ea-9e15-477a-925d-951aad8ace93"><br>
</span></div>
</font><br>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

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